Task: | Ruudukko |
Sender: | Mahtimursu |
Submission time: | 2023-05-30 00:36:17 +0300 |
Language: | C++ (C++17) |
Status: | READY |
Result: | 44 |
group | verdict | score |
---|---|---|
#1 | ACCEPTED | 5 |
#2 | ACCEPTED | 12 |
#3 | ACCEPTED | 27 |
#4 | TIME LIMIT EXCEEDED | 0 |
#5 | TIME LIMIT EXCEEDED | 0 |
test | verdict | time | group | |
---|---|---|---|---|
#1 | ACCEPTED | 0.00 s | 1, 5 | details |
#2 | ACCEPTED | 0.00 s | 2, 5 | details |
#3 | ACCEPTED | 0.00 s | 3, 5 | details |
#4 | TIME LIMIT EXCEEDED | -- | 4, 5 | details |
#5 | ACCEPTED | 0.01 s | 5 | details |
#6 | ACCEPTED | 0.01 s | 5 | details |
#7 | ACCEPTED | 0.00 s | 2, 5 | details |
#8 | ACCEPTED | 0.00 s | 2, 5 | details |
#9 | ACCEPTED | 0.00 s | 3, 5 | details |
#10 | ACCEPTED | 0.00 s | 3, 5 | details |
#11 | ACCEPTED | 0.00 s | 3, 5 | details |
#12 | ACCEPTED | 0.00 s | 3, 5 | details |
#13 | ACCEPTED | 0.00 s | 4, 5 | details |
#14 | TIME LIMIT EXCEEDED | -- | 5 | details |
#15 | ACCEPTED | 0.00 s | 3, 5 | details |
#16 | ACCEPTED | 0.01 s | 5 | details |
Compiler report
input/code.cpp: In function 'void solver_all::solve_mid_rev(int, int, int, int, std::pair<int, int>)': input/code.cpp:631:9: warning: unused variable 'on' [-Wunused-variable] 631 | int on = n; | ^~ input/code.cpp: In function 'void solve_mid_rev(int, int, int, int, std::pair<int, int>)': input/code.cpp:1195:9: warning: unused variable 'on' [-Wunused-variable] 1195 | int on = n; | ^~ input/code.cpp: In function 'void solver_all::solve_strip_hor(bool, int, int, std::pair<int, int>)': input/code.cpp:367:5: warning: 'up' may be used uninitialized [-Wmaybe-uninitialized] 367 | if (up) { | ^~ input/code.cpp: In function 'void solver_all::solve_strip_ver(bool, int, int, std::pair<int, int>)': input/code.cpp:470:5: warning: 'left' may be used uninitialized [-Wmaybe-uninitialized] 470 | if (left) { | ^~ input/code.cpp: In function 'void solve_strip_ver(bool, int, int, std::pair<int, int>)': input/code.cpp:1104:5: warning: 'l...
Code
#include <bits/stdc++.h> typedef long long ll; #define y first #define x second using namespace std; namespace solver_all { int s2 = 0; const int MAX_N = 10000; char result[MAX_N + 1][MAX_N + 1]; inline void st(char c, pair<int, int> pos, pair<int, int> offset) { result[pos.y + offset.y][pos.x + offset.x] = c; } inline char gt(pair<int, int> pos, pair<int, int> offset) { return result[pos.y + offset.y][pos.x + offset.x]; } inline pair<int, int> step(char c, pair<int, int> pos) { if (c == 'U') return {pos.y - 1, pos.x}; if (c == 'D') return {pos.y + 1, pos.x}; if (c == 'R') return {pos.y, pos.x + 1}; if (c == 'L') return {pos.y, pos.x - 1}; return {0, 0}; } inline char gt_rev(char c) { if (c == 'U') return 'D'; if (c == 'D') return 'U'; if (c == 'R') return 'L'; if (c == 'L') return 'R'; return '?'; } void rev_from(pair<int, int> s, pair<int, int> t, pair<int, int> offset) { // s = start in the wrong order // means that pos[t] will be empty // but pos[s] should be empty char c = gt(s, offset); s = step(gt(s, offset), s); while (s != t) { char nxt = gt(s, offset); st(gt_rev(c), s, offset); c = nxt; s = step(nxt, s); } st(gt_rev(c), s, offset); } namespace mango { void solveSmall(int h, int w, int y0, int x0, int y1, int x1, pair<int, int> offset) { bool swp = 0; if (x0 > x1 || (x0 == x1 && y0 > y1)) { swp = 1; swap(x0, x1); swap(y0, y1); } if (h == 1) { if (x0 == 1 && x1 == w) { for (int i = 0; i < w - 1; ++i) { if (!swp) { st('R', {y0, x0}, offset); offset.x++; } else { offset.x++; st('L', {y0, x0}, offset); } } return; } if (x0 == w && x1 == 1) { for (int i = 0; i < w - 1; ++i) { if (!swp) { st('L', {y0, x0}, offset); offset.x--; } else { offset.x--; st('R', {y0, x0}, offset); } } return; } } else { string res; if (x0 == x1 && x0 == 1) { for (int i = 0; i < w-1; ++i) { if (!swp) st('R', {y0, x0}, offset); offset.x++; if (swp) st('L', {y0, x0}, offset); } if (y0 == 1) { if (!swp) st('D', {y0, x0}, offset); offset.y++; if (swp) st('U', {y0, x0}, offset); } else { if (!swp) st('U', {y0, x0}, offset); offset.y--; if (swp) st('D', {y0, x0}, offset); } for (int i = 0; i < w-1; ++i) { if (!swp) st('L', {y0, x0}, offset); offset.x--; if (swp) st('R', {y0, x0}, offset); } } else { for (int i = 1; i < x0; ++i) { if (!swp) st('L', {y0, x0}, offset); offset.x--; if (swp) st('R', {y0, x0}, offset); } if (y0 == 1) { if (!swp) st('D', {y0, x0}, offset); offset.y++; if (swp) st('U', {y0, x0}, offset); } else { if (!swp) st('U', {y0, x0}, offset); offset.y--; if (swp) st('D', {y0, x0}, offset); } for (int i = 1; i < x0; ++i) { if (!swp) st('R', {y0, x0}, offset); offset.x++; if (swp) st('L', {y0, x0}, offset); } if (x0 == x1) return; for (int i = 1; i < x1 - x0; ++i) { if (!swp) st('R', {y0, x0}, offset); offset.x++; if (swp) st('L', {y0, x0}, offset); if (((i - 1) ^ (y0 - 1)) & 1) { if (!swp) st('D', {y0, x0}, offset); offset.y++; if (swp) st('U', {y0, x0}, offset); } else { if (!swp) st('U', {y0, x0}, offset); offset.y--; if (swp) st('D', {y0, x0}, offset); } } if (!swp) st('R', {y0, x0}, offset); offset.x++; if (swp) st('L', {y0, x0}, offset); for (int i = 0; i < w - x1; ++i) { if (!swp) st('R', {y0, x0}, offset); offset.x++; if (swp) st('L', {y0, x0}, offset); } if (y1 == 1) { if (!swp) st('U', {y0, x0}, offset); offset.y--; if (swp) st('D', {y0, x0}, offset); } else { if (!swp) st('D', {y0, x0}, offset); offset.y++; if (swp) st('U', {y0, x0}, offset); } for (int i = 0; i < w - x1; ++i) { if (!swp) st('L', {y0, x0}, offset); offset.x--; if (swp) st('R', {y0, x0}, offset); } } } } void solve2(int n, int m, pair<int, int> s, pair<int, int> t, pair<int, int> offset) { s2++; solveSmall(n, m, s.y, s.x, t.y, t.x, offset); } }; bool check_small(int h, int w, int y0, int x0, int y1, int x1) { if (x0 > x1 || (x0 == x1 && y0 > y1)) return check_small(h, w, y1, x1, y0, x0); if (h == 1) { if (x0 == 0 && x1 == w-1) return true; if (x0 == w-1 && x1 == 0) return true; return false; } else { if (x0 == x1 && 0 < x0 && x0 < w-1) return false; return true; } } bool works(int h, int w, int y0, int x0, int y1, int x1) { if (y0 == y1 && x0 == x1) return false; if (w < h) return works(w, h, x0, y0, x1, y1); if (! ((h*w ^ abs(x0 - x1) ^ abs(y0 - y1)) & 1)) return false; if ((h*w & 1) && ((x0 + y0) & 1)) return false; if (h <= 2) return check_small(h, w, y0, x0, y1, x1); if (h == 3 && (!(w & 1))) { if (y0 == 1) { if ((x0 & 1) && x1 < x0) return false; if (!(x0 & 1) && x1 > x0) return false; } else { if (!(x0 & 1) && (x1 < x0 - 1)) return false; if ((x0 & 1) && (x1 > x0 + 1)) return false; } } return true; } bool inside(int n, int m, pair<int, int> p) { return p.x <= m && p.y <= n && p.x > 0 && p.y > 0; } bool ok(int h, int w, pair<int, int> s, pair<int, int> t) { if (h == 0) return s.x == t.x; if (!inside(h, w, s) || !inside(h, w, t)) return false; return works(h, w, s.y - 1, s.x - 1, t.y - 1, t.x - 1); } pair<int, int> ot(pair<int, int> p, pair<int, int> off) { return {p.y + off.y, p.x + off.x}; } const int cutoff = 20; bool vis[MAX_N + 1][MAX_N + 1]; bool run_brute(int n, int m, pair<int, int> c, pair<int, int> t, int left, pair<int, int> offset) { if (c.x < 1 || c.x > m || c.y < 1 || c.y > n) return false; if (vis[c.y][c.x]) return false; if (left == 0) { if (c != t) return false; st('E', c, offset); return true; } vis[c.y][c.x] = 1; if (run_brute(n, m, {c.y - 1, c.x}, t, left - 1, offset)) { st('U', c, offset); return true; } if (run_brute(n, m, {c.y + 1, c.x}, t, left - 1, offset)) { st('D', c, offset); return true; } if (run_brute(n, m, {c.y, c.x - 1}, t, left - 1, offset)) { st('L', c, offset); return true; } if (run_brute(n, m, {c.y, c.x + 1}, t, left - 1, offset)) { st('R', c, offset); return true; } vis[c.y][c.x] = 0; return false; } int c = 0; void brute(int n, int m, pair<int, int> s, pair<int, int> t, pair<int, int> offset) { c++; for (int i = 1; i <= n; ++i) { for (int j = 1; j <= m; ++j) vis[i][j] = 0; } run_brute(n, m, s, t, n * m - 1, offset); } void solve_strip_hor(bool left, int n, int m, pair<int, int> offset) { int s_idx = 0; bool up; pair<int, int> cp; // cout << "here hor " << left << " " << n << " " << m << " " << offset.y << " " << offset.x << endl; if (left) { for (int i = 1; i <= n; ++i) { char c = gt({i, m + 1}, offset); if (c == 'D') { up = 1; s_idx = i; break; } else if (c == 'U') { up = 0; s_idx = i; break; } } st('L', {s_idx, m + 1}, offset); cp = {s_idx, m}; } else { for (int i = 1; i <= n; ++i) { char c = gt({i, 0}, offset); if (c == 'D') { up = 1; s_idx = i; break; } else if (c == 'U') { up = 0; s_idx = i; break; } } st('R', {s_idx, 0}, offset); cp = {s_idx, 1}; } if (up) { while (cp.y != 1) { st('U', cp, offset); cp.y--; } } else { while (cp.y != n) { st('D', cp, offset); cp.y++; } } if (left) { st('L', cp, offset); cp.x--; } else { st('R', cp, offset); cp.x++; } if (up) { while (cp.y != n) { st('D', cp, offset); cp.y++; } } else { while (cp.y != 1) { st('U', cp, offset); cp.y--; } } if (left) { st('R', cp, offset); cp.x++; } else { st('L', cp, offset); cp.x--; } if (up) { while (cp.y != s_idx + 1) { st('U', cp, offset); cp.y--; } } else { while (cp.y != s_idx - 1) { st('D', cp, offset); cp.y++; } } if (left) { st('R', cp, offset); cp.x++; } else { st('L', cp, offset); cp.x--; } } void solve_strip_ver(bool up, int n, int m, pair<int, int> offset) { int s_idx = 0; bool left; pair<int, int> cp; // cout << "here hor " << left << " " << n << " " << m << " " << offset.y << " " << offset.x << endl; if (up) { for (int i = 1; i <= m; ++i) { char c = gt({n + 1, i}, offset); if (c == 'R') { left = 1; s_idx = i; break; } else if (c == 'L') { left = 0; s_idx = i; break; } } st('U', {n + 1, s_idx}, offset); cp = {n, s_idx}; } else { for (int i = 1; i <= m; ++i) { char c = gt({0, i}, offset); if (c == 'R') { left = 1; s_idx = i; break; } else if (c == 'L') { left = 0; s_idx = i; break; } } st('D', {0, s_idx}, offset); cp = {1, s_idx}; } if (left) { while (cp.x != 1) { st('L', cp, offset); cp.x--; } } else { while (cp.x != m) { st('R', cp, offset); cp.x++; } } if (up) { st('U', cp, offset); cp.y--; } else { st('D', cp, offset); cp.y++; } if (left) { while (cp.x != m) { st('R', cp, offset); cp.x++; } } else { while (cp.x != 1) { st('L', cp, offset); cp.x--; } } if (up) { st('D', cp, offset); cp.y++; } else { st('U', cp, offset); cp.y--; } if (left) { while (cp.x != s_idx + 1) { st('L', cp, offset); cp.x--; } } else { while (cp.x != s_idx - 1) { st('R', cp, offset); cp.x++; } } if (up) { st('D', cp, offset); cp.y++; } else { st('U', cp, offset); cp.y--; } } void solve_m(int n, int m, pair<int, int> s, pair<int, int> t, pair<int, int> offset) { // cout << "here: " << n << " " << m << " " << s.y << " " << s.x << " " << t.y << " " << t.x << endl; int min_j = min(s.x, t.x); int max_j = max(s.x, t.x); /*for (int j = min_j - min_j % 2; j > 0; j -= 2) {*/ for (int j = 2; j > 0; j -= 2) { if (min_j > j) { if (ok(n, m - j, ot(s, {0, -j}), ot(t, {0, -j}))) { solve_m(n, m - j, ot(s, {0, -j}), ot(t, {0, -j}), ot(offset, {0, j})); solve_strip_hor(true, n, j, offset); return; } } } /*for (int j = (m - max_j) / 2 * 2; j > 0; j -= 2) {*/ for (int j = 2; j > 0; j -= 2) { if (max_j <= m - j) { if (ok(n, m - j, s, t)) { solve_m(n, m - j, s, t, offset); solve_strip_hor(false, n, j, ot(offset, {0, m - j})); return; } } } if (s.x > t.x) { // cout << "reversed: " << s.y << " " << s.x << " " << t.y << " " << t.x << endl; char c = gt(t, offset); solve_m(n, m, t, s, offset); rev_from(t, s, offset); st(c, t, offset); return; } vector<int> st_i; st_i.push_back(1); st_i.push_back(2); if (n % 2 == 0) st_i.push_back(n); else st_i.push_back(n - 1); for (int i : st_i) { int first_m = 2; int second_m = m - 2; pair<int, int> first_e = {i, first_m}; pair<int, int> second_e = {i, first_m + 1}; if (inside(n, first_m, s) && inside(n, second_m, ot(t, {0, -first_m})) && ok(n, first_m, s, first_e) && ok(n, second_m, ot(t, {0, -first_m}), ot(second_e, {0, -first_m})) ) { solve_m(n, first_m, s, first_e, offset); st('R', first_e, offset); solve_m(n, second_m, ot(second_e, {0, -first_m}), ot(t, {0, -first_m}), ot(offset, {0, first_m})); return; } } brute(n, m, s, t, offset); } int ckmid = 0; int ckmidloop = 0; void solve_mid(int n, int m, int j1, int j2, pair<int, int> offset) { while (n > 2) { ckmidloop++; if (n * m <= cutoff) { brute(n, m, {1, j1}, {n, j2}, offset); return; } for (int j = 2 - (j1 % 2); j <= m; j += 2) { ckmid++; if (j == j1 && j1 != 1 && j1 != m) continue; if (ok(n - 2, m, {1, j}, {n - 2, j2})) { mango::solve2(2, m, {1, j1}, {2, j}, offset); offset.y += 2; j1 = j; break; } } st('D', {0, j1}, offset); n -= 2; } mango::solve2(2, m, {1, j1}, {2, j2}, offset); } void solve_mid_rev(int n, int m, int j1, int j2, pair<int, int> offset) { // {n, j2} -> {1, j1} //cout << "called: " << n << " " << m << " " << j1 << " " << j2 << " " << offset.y << " " << offset.x << endl; int on = n; while (n > 2) { ckmidloop++; if (n * m <= cutoff) { brute(n, m, {n, j2}, {1, j1}, offset); return; } for (int j = 2 - (j2 % 2); j <= m; j += 2) { ckmid++; if (j == j2 && j2 != 1 && j2 != m) continue; if (ok(n - 2, m, {n - 2, j}, {1, j1})) { mango::solve2(2, m, {2, j2}, {1, j}, ot(offset, {n - 2, 0})); st('U', {1, j}, ot(offset, {n - 2, 0})); j2 = j; break; } } n -= 2; } mango::solve2(2, m, {2, j2}, {1, j1}, offset); /*for (int i = 1; i <= on + 1; ++i) { for (int j = 1; j <= m; ++j) { cout << gt({i, j}, offset); } cout << endl; } cout << "END\n";*/ } int scc = 0; int chc = 0; void solve(int n, int m, pair<int, int> s, pair<int, int> t, pair<int, int> offset) { scc++; if (n <= 2) { mango::solve2(n, m, s, t, offset); return; } int min_i = min(s.y, t.y); int max_i = max(s.y, t.y); /*for (int i = min_i - min_i % 2; i > 0; i -= 2) {*/ for (int i = 2; i > 0; i -= 2) { if (min_i > i) { if (ok(n - i, m, ot(s, {-i, 0}), ot(t, {-i, 0}))) { solve(n - i, m, ot(s, {-i, 0}), ot(t, {-i, 0}), ot(offset, {i, 0})); solve_strip_ver(true, i, m, offset); return; } } } /*for (int i = (n - max_i) / 2 * 2; i > 0; i -= 2) {*/ for (int i = 2; i > 0; i -= 2) { if (max_i <= n - i) { if (ok(n - i, m, s, t)) { solve(n - i, m, s, t, offset); solve_strip_ver(false, i, m, ot(offset, {n - i, 0})); return; } } } if (n <= 3 || max_i <= 2 || min_i > 2) { solve_m(n, m, s, t, offset); return; } if (s > t) { int left_n = 2; int right_n = 2 + (n % 2); int mid = n - left_n - right_n; int color = (t.x + t.y) % 2; for (int j1 = 1 + color; j1 <= m; j1 += 2) { for (int j2 = 1 + color; j2 <= m; j2 += 2) { chc++; pair<int, int> first_e = {left_n, j1}; pair<int, int> second_e = {1, j2}; if (mid == 0 && j1 != j2) continue; if (mid == 2 && j1 == j2 && j1 != 1 && j1 != m) continue; if (ok(left_n, m, first_e, t) && ok(right_n, m, ot(s, {-(left_n + mid), 0}), second_e) ) { solve_m(right_n, m, ot(s, {-(left_n + mid), 0}), second_e, ot(offset, {left_n + mid, 0})); st('U', second_e, ot(offset, {left_n + mid, 0})); if (mid != 0) { solve_mid_rev(mid, m, j1, j2, ot(offset, {2, 0})); st('U', {1, j1}, ot(offset, {2, 0})); } mango::solve2(left_n, m, first_e, t, offset); return; } } } solve_m(n, m, s, t, offset); return; } int left_n = 2; int right_n = 2 + (n % 2); int mid = n - left_n - right_n; int color = (s.x + s.y) % 2; for (int j1 = 1 + color; j1 <= m; j1 += 2) { for (int j2 = 1 + color; j2 <= m; j2 += 2) { chc++; pair<int, int> first_e = {left_n, j1}; pair<int, int> second_e = {1, j2}; if (mid == 0 && j1 != j2) continue; if (mid == 2 && j1 == j2 && j1 != 1 && j1 != m) continue; if (ok(left_n, m, s, first_e) && ok(right_n, m, second_e, ot(t, {-(left_n + mid), 0})) ) { mango::solve2(left_n, m, s, first_e, offset); st('D', first_e, offset); if (mid != 0) { solve_mid(mid, m, j1, j2, ot(offset, {2, 0})); st('D', {mid, j2}, ot(offset, {2, 0})); } solve_m(right_n, m, second_e, ot(t, {-(left_n + mid), 0}), ot(offset, {left_n + mid, 0})); return; } } } solve_m(n, m, s, t, offset); } } int s2 = 0; const int MAX_N = 10000; char result[MAX_N + 1][MAX_N + 1]; inline void st(char c, pair<int, int> pos, pair<int, int> offset) { result[pos.y + offset.y][pos.x + offset.x] = c; } inline char gt(pair<int, int> pos, pair<int, int> offset) { return result[pos.y + offset.y][pos.x + offset.x]; } inline pair<int, int> step(char c, pair<int, int> pos) { if (c == 'U') return {pos.y - 1, pos.x}; if (c == 'D') return {pos.y + 1, pos.x}; if (c == 'R') return {pos.y, pos.x + 1}; if (c == 'L') return {pos.y, pos.x - 1}; return {0, 0}; } inline char gt_rev(char c) { if (c == 'U') return 'D'; if (c == 'D') return 'U'; if (c == 'R') return 'L'; if (c == 'L') return 'R'; return '?'; } void rev_from(pair<int, int> s, pair<int, int> t, pair<int, int> offset) { // s = start in the wrong order // means that pos[t] will be empty // but pos[s] should be empty char c = gt(s, offset); s = step(gt(s, offset), s); while (s != t) { char nxt = gt(s, offset); st(gt_rev(c), s, offset); c = nxt; s = step(nxt, s); } st(gt_rev(c), s, offset); } namespace mango { void solveSmall(int h, int w, int y0, int x0, int y1, int x1, pair<int, int> offset) { bool swp = 0; if (x0 > x1 || (x0 == x1 && y0 > y1)) { swp = 1; swap(x0, x1); swap(y0, y1); } string res; if (x0 == x1 && x0 == 1) { for (int i = 0; i < w-1; ++i) { if (!swp) st('R', {y0, x0}, offset); offset.x++; if (swp) st('L', {y0, x0}, offset); } if (y0 == 1) { if (!swp) st('D', {y0, x0}, offset); offset.y++; if (swp) st('U', {y0, x0}, offset); } else { if (!swp) st('U', {y0, x0}, offset); offset.y--; if (swp) st('D', {y0, x0}, offset); } for (int i = 0; i < w-1; ++i) { if (!swp) st('L', {y0, x0}, offset); offset.x--; if (swp) st('R', {y0, x0}, offset); } } else { for (int i = 1; i < x0; ++i) { if (!swp) st('L', {y0, x0}, offset); offset.x--; if (swp) st('R', {y0, x0}, offset); } if (y0 == 1) { if (!swp) st('D', {y0, x0}, offset); offset.y++; if (swp) st('U', {y0, x0}, offset); } else { if (!swp) st('U', {y0, x0}, offset); offset.y--; if (swp) st('D', {y0, x0}, offset); } for (int i = 1; i < x0; ++i) { if (!swp) st('R', {y0, x0}, offset); offset.x++; if (swp) st('L', {y0, x0}, offset); } if (x0 == x1) return; for (int i = 1; i < x1 - x0; ++i) { if (!swp) st('R', {y0, x0}, offset); offset.x++; if (swp) st('L', {y0, x0}, offset); if (((i - 1) ^ (y0 - 1)) & 1) { if (!swp) st('D', {y0, x0}, offset); offset.y++; if (swp) st('U', {y0, x0}, offset); } else { if (!swp) st('U', {y0, x0}, offset); offset.y--; if (swp) st('D', {y0, x0}, offset); } } if (!swp) st('R', {y0, x0}, offset); offset.x++; if (swp) st('L', {y0, x0}, offset); for (int i = 0; i < w - x1; ++i) { if (!swp) st('R', {y0, x0}, offset); offset.x++; if (swp) st('L', {y0, x0}, offset); } if (y1 == 1) { if (!swp) st('U', {y0, x0}, offset); offset.y--; if (swp) st('D', {y0, x0}, offset); } else { if (!swp) st('D', {y0, x0}, offset); offset.y++; if (swp) st('U', {y0, x0}, offset); } for (int i = 0; i < w - x1; ++i) { if (!swp) st('L', {y0, x0}, offset); offset.x--; if (swp) st('R', {y0, x0}, offset); } } } void solve2(int n, int m, pair<int, int> s, pair<int, int> t, pair<int, int> offset) { s2++; solveSmall(n, m, s.y, s.x, t.y, t.x, offset); } }; bool check_small(int h, int w, int y0, int x0, int y1, int x1) { if (x0 > x1 || (x0 == x1 && y0 > y1)) return check_small(h, w, y1, x1, y0, x0); if (h == 1) { if (x0 == 0 && x1 == w-1) return true; if (x0 == w-1 && x1 == 0) return true; return false; } else { if (x0 == x1 && 0 < x0 && x0 < w-1) return false; return true; } } bool works(int h, int w, int y0, int x0, int y1, int x1) { if (y0 == y1 && x0 == x1) return false; if (w < h) return works(w, h, x0, y0, x1, y1); if (! ((h*w ^ abs(x0 - x1) ^ abs(y0 - y1)) & 1)) return false; if ((h*w & 1) && ((x0 + y0) & 1)) return false; if (h <= 2) return check_small(h, w, y0, x0, y1, x1); if (h == 3 && (!(w & 1))) { if (y0 == 1) { if ((x0 & 1) && x1 < x0) return false; if (!(x0 & 1) && x1 > x0) return false; } else { if (!(x0 & 1) && (x1 < x0 - 1)) return false; if ((x0 & 1) && (x1 > x0 + 1)) return false; } } return true; } bool inside(int n, int m, pair<int, int> p) { return p.x <= m && p.y <= n && p.x > 0 && p.y > 0; } bool ok(int h, int w, pair<int, int> s, pair<int, int> t) { if (h == 0) return s.x == t.x; if (!inside(h, w, s) || !inside(h, w, t)) return false; return works(h, w, s.y - 1, s.x - 1, t.y - 1, t.x - 1); } pair<int, int> ot(pair<int, int> p, pair<int, int> off) { return {p.y + off.y, p.x + off.x}; } const int cutoff = 20; bool vis[MAX_N + 1][MAX_N + 1]; bool run_brute(int n, int m, pair<int, int> c, pair<int, int> t, int left, pair<int, int> offset) { if (c.x < 1 || c.x > m || c.y < 1 || c.y > n) return false; if (vis[c.y][c.x]) return false; if (left == 0) { if (c != t) return false; st('E', c, offset); return true; } vis[c.y][c.x] = 1; if (run_brute(n, m, {c.y - 1, c.x}, t, left - 1, offset)) { st('U', c, offset); return true; } if (run_brute(n, m, {c.y + 1, c.x}, t, left - 1, offset)) { st('D', c, offset); return true; } if (run_brute(n, m, {c.y, c.x - 1}, t, left - 1, offset)) { st('L', c, offset); return true; } if (run_brute(n, m, {c.y, c.x + 1}, t, left - 1, offset)) { st('R', c, offset); return true; } vis[c.y][c.x] = 0; return false; } int c = 0; void brute(int n, int m, pair<int, int> s, pair<int, int> t, pair<int, int> offset) { c++; for (int i = 1; i <= n; ++i) { for (int j = 1; j <= m; ++j) vis[i][j] = 0; } run_brute(n, m, s, t, n * m - 1, offset); } void solve_strip_ver(bool up, int n, int m, pair<int, int> offset) { int s_idx = 0; bool left; pair<int, int> cp; if (up) { for (int i = 1; i <= m; ++i) { char c = gt({n + 1, i}, offset); if (c == 'R') { left = 1; s_idx = i; break; } else if (c == 'L') { left = 0; s_idx = i; break; } } st('U', {n + 1, s_idx}, offset); cp = {n, s_idx}; } else { for (int i = 1; i <= m; ++i) { char c = gt({0, i}, offset); if (c == 'R') { left = 1; s_idx = i; break; } else if (c == 'L') { left = 0; s_idx = i; break; } } st('D', {0, s_idx}, offset); cp = {1, s_idx}; } if (left) { while (cp.x != 1) { st('L', cp, offset); cp.x--; } } else { while (cp.x != m) { st('R', cp, offset); cp.x++; } } if (up) { st('U', cp, offset); cp.y--; } else { st('D', cp, offset); cp.y++; } if (left) { while (cp.x != m) { st('R', cp, offset); cp.x++; } } else { while (cp.x != 1) { st('L', cp, offset); cp.x--; } } if (up) { st('D', cp, offset); cp.y++; } else { st('U', cp, offset); cp.y--; } if (left) { while (cp.x != s_idx + 1) { st('L', cp, offset); cp.x--; } } else { while (cp.x != s_idx - 1) { st('R', cp, offset); cp.x++; } } if (up) { st('D', cp, offset); cp.y++; } else { st('U', cp, offset); cp.y--; } } int ckmid = 0; int ckmidloop = 0; void solve_mid(int n, int m, int j1, int j2, pair<int, int> offset) { while (n > 2) { ckmidloop++; if (n * m <= cutoff) { brute(n, m, {1, j1}, {n, j2}, offset); return; } for (int j = 2 - (j1 % 2); j <= m; j += 2) { ckmid++; if (j == j1 && j1 != 1 && j1 != m) continue; if (ok(n - 2, m, {1, j}, {n - 2, j2})) { mango::solve2(2, m, {1, j1}, {2, j}, offset); offset.y += 2; j1 = j; break; } } st('D', {0, j1}, offset); n -= 2; } mango::solve2(2, m, {1, j1}, {2, j2}, offset); } void solve_mid_rev(int n, int m, int j1, int j2, pair<int, int> offset) { int on = n; while (n > 2) { ckmidloop++; if (n * m <= cutoff) { brute(n, m, {n, j2}, {1, j1}, offset); return; } for (int j = 2 - (j2 % 2); j <= m; j += 2) { ckmid++; if (j == j2 && j2 != 1 && j2 != m) continue; if (ok(n - 2, m, {n - 2, j}, {1, j1})) { mango::solve2(2, m, {2, j2}, {1, j}, ot(offset, {n - 2, 0})); st('U', {1, j}, ot(offset, {n - 2, 0})); j2 = j; break; } } n -= 2; } mango::solve2(2, m, {2, j2}, {1, j1}, offset); } int scc = 0; int chc = 0; void solve(int n, int m, pair<int, int> s, pair<int, int> t, pair<int, int> offset) { scc++; if (n <= 2) { mango::solve2(n, m, s, t, offset); return; } int min_i = min(s.y, t.y); int max_i = max(s.y, t.y); /*for (int i = min_i - min_i % 2; i > 0; i -= 2) {*/ for (int i = 2; i > 0; i -= 2) { if (min_i > i) { if (ok(n - i, m, ot(s, {-i, 0}), ot(t, {-i, 0}))) { solve(n - i, m, ot(s, {-i, 0}), ot(t, {-i, 0}), ot(offset, {i, 0})); solve_strip_ver(true, i, m, offset); return; } } } /*for (int i = (n - max_i) / 2 * 2; i > 0; i -= 2) {*/ for (int i = 2; i > 0; i -= 2) { if (max_i <= n - i) { if (ok(n - i, m, s, t)) { solve(n - i, m, s, t, offset); solve_strip_ver(false, i, m, ot(offset, {n - i, 0})); return; } } } if (n <= 3 || max_i <= 2 || min_i > 2) { brute(n, m, s, t, offset); return; } if (s > t) { int left_n = 2; int right_n = 2; int mid = n - left_n - right_n; int color = (t.x + t.y) % 2; for (int j1 = 1 + color; j1 <= m; j1 += 2) { for (int j2 = 1 + color; j2 <= m; j2 += 2) { chc++; pair<int, int> first_e = {left_n, j1}; pair<int, int> second_e = {1, j2}; if (mid == 0 && j1 != j2) continue; if (mid == 2 && j1 == j2 && j1 != 1 && j1 != m) continue; if (ok(left_n, m, first_e, t) && ok(right_n, m, ot(s, {-(left_n + mid), 0}), second_e) ) { mango::solve2(right_n, m, ot(s, {-(left_n + mid), 0}), second_e, ot(offset, {left_n + mid, 0})); st('U', second_e, ot(offset, {left_n + mid, 0})); if (mid != 0) { solve_mid_rev(mid, m, j1, j2, ot(offset, {2, 0})); st('U', {1, j1}, ot(offset, {2, 0})); } mango::solve2(left_n, m, first_e, t, offset); return; } } } return; } int left_n = 2; int right_n = 2; int mid = n - left_n - right_n; int color = (s.x + s.y) % 2; for (int j1 = 1 + color; j1 <= m; j1 += 2) { for (int j2 = 1 + color; j2 <= m; j2 += 2) { chc++; pair<int, int> first_e = {left_n, j1}; pair<int, int> second_e = {1, j2}; if (mid == 0 && j1 != j2) continue; if (mid == 2 && j1 == j2 && j1 != 1 && j1 != m) continue; if (ok(left_n, m, s, first_e) && ok(right_n, m, second_e, ot(t, {-(left_n + mid), 0})) ) { mango::solve2(left_n, m, s, first_e, offset); st('D', first_e, offset); if (mid != 0) { solve_mid(mid, m, j1, j2, ot(offset, {2, 0})); st('D', {mid, j2}, ot(offset, {2, 0})); } mango::solve2(right_n, m, second_e, ot(t, {-(left_n + mid), 0}), ot(offset, {left_n + mid, 0})); return; } } } } void test_case() { int n, m; pair<int, int> s, t; cin >> n >> m >> s.y >> s.x >> t.y >> t.x; if (!ok(n, m, s, t)) { cout << "NO" << "\n"; return; } cout << "YES" << "\n"; for (int i = 1; i <= n; ++i) { for (int j = 1; j <= m; ++j) { result[i][j] = '?'; } } // ignore odd if (n & 1) { for (int i = 1; i <= n; ++i) { for (int j = 1; j <= m; ++j) { solver_all::result[i][j] = '?'; } } solver_all::solve(n, m, s, t, {0, 0}); for (int i = 1; i < n * m; ++i) { char c = solver_all::result[s.y][s.x]; cout << c; s = step(c, s); } cout << "\n"; return; } solve(n, m, s, t, {0, 0}); for (int i = 1; i < n * m; ++i) { char c = result[s.y][s.x]; cout << c; s = step(c, s); } cout << "\n"; } int main() { ios_base::sync_with_stdio(false); cin.tie(nullptr); int t = 1; cin >> t; for (int i = 0; i < t; ++i) { test_case(); } return 0; }
Test details
Test 1
Group: 1, 5
Verdict: ACCEPTED
input |
---|
100 1 45 1 45 1 1 1 18 1 1 1 10 1 47 1 17 1 30 1 33 1 28 1 20 ... |
correct output |
---|
YES LLLLLLLLLLLLLLLLLLLLLLLLLLLLLL... |
user output |
---|
YES LLLLLLLLLLLLLLLLLLLLLLLLLLLLLL... Truncated |
Test 2
Group: 2, 5
Verdict: ACCEPTED
input |
---|
100 2 43 1 33 1 21 2 2 1 1 2 2 2 32 1 1 2 8 2 14 1 12 1 14 ... |
correct output |
---|
NO NO NO NO YES ... |
user output |
---|
NO NO NO NO YES ... Truncated |
Test 3
Group: 3, 5
Verdict: ACCEPTED
input |
---|
100 3 4 2 1 2 4 3 38 2 24 1 22 3 29 2 23 2 3 3 8 3 1 1 2 ... |
correct output |
---|
NO NO NO YES RRRRRRRUULDLULDLULDLLUR ... |
user output |
---|
NO NO NO YES RRRURDRURDRUULLLLLDLLUR ... Truncated |
Test 4
Group: 4, 5
Verdict: TIME LIMIT EXCEEDED
input |
---|
100 4 25 2 19 1 5 4 13 3 10 4 12 4 7 3 1 4 2 4 23 1 19 2 5 ... |
correct output |
---|
YES DDRRRRRRULLLLLURRRRRULLLLLLLDD... |
user output |
---|
(empty) |
Test 5
Group: 5
Verdict: ACCEPTED
input |
---|
100 16 8 13 1 14 8 41 21 19 11 32 12 46 17 13 7 6 11 8 41 4 32 4 12 ... |
correct output |
---|
NO YES LURULURULURULURULURRDDDDDDDDDR... |
user output |
---|
NO YES RRRRRRRRRRDLLLLLLLLLLLULDLULDL... Truncated |
Test 6
Group: 5
Verdict: ACCEPTED
input |
---|
100 31 38 18 35 31 37 35 48 7 13 21 21 46 21 25 2 4 19 35 2 13 2 35 1 ... |
correct output |
---|
YES LLLLLLLLLLLLDRRRRRRRRRRRRDLLLL... |
user output |
---|
YES RRRULLLLDLULDLULDLULDLULDLULDL... Truncated |
Test 7
Group: 2, 5
Verdict: ACCEPTED
input |
---|
100 2 4 1 3 1 4 2 4 2 2 1 1 2 4 2 3 1 2 2 4 2 3 1 4 ... |
correct output |
---|
YES LLDRRRU NO NO NO ... |
user output |
---|
YES LLDRRRU NO NO NO ... Truncated |
Test 8
Group: 2, 5
Verdict: ACCEPTED
input |
---|
100 2 5 1 2 2 4 2 5 1 2 1 1 2 5 2 1 1 2 2 5 1 1 1 5 ... |
correct output |
---|
YES LDRRURRDL YES RRRDLLLLU NO ... |
user output |
---|
YES LDRRURRDL YES RRRDLLLLU NO ... Truncated |
Test 9
Group: 3, 5
Verdict: ACCEPTED
input |
---|
100 3 4 1 1 2 3 3 4 2 4 3 2 3 4 2 1 3 1 3 4 1 4 3 4 ... |
correct output |
---|
YES DDRRRUULLDR NO YES URRRDDLULDL ... |
user output |
---|
YES DDRUURRDDLU NO YES URRRDDLULDL ... Truncated |
Test 10
Group: 3, 5
Verdict: ACCEPTED
input |
---|
100 3 5 3 4 3 2 3 5 3 5 2 3 3 5 3 1 2 2 3 5 3 1 3 2 ... |
correct output |
---|
NO NO YES UURRRRDDLULDLU NO ... |
user output |
---|
NO NO YES UURRRRDDLULDLU NO ... Truncated |
Test 11
Group: 3, 5
Verdict: ACCEPTED
input |
---|
100 3 8 2 8 1 2 3 8 2 4 1 7 3 8 3 4 2 7 3 8 2 5 3 1 ... |
correct output |
---|
NO NO NO YES LLLDRRRRURDRUULLLLLLLDD ... |
user output |
---|
NO NO NO YES DRURDRUULLLLDDLUULLDRDL ... Truncated |
Test 12
Group: 3, 5
Verdict: ACCEPTED
input |
---|
100 3 9 1 3 2 9 3 9 1 6 1 5 3 9 3 6 2 8 3 9 3 2 3 4 ... |
correct output |
---|
NO NO NO NO NO ... |
user output |
---|
NO NO NO NO NO ... Truncated |
Test 13
Group: 4, 5
Verdict: ACCEPTED
input |
---|
100 4 4 2 2 1 4 4 4 4 1 2 2 4 4 2 1 4 3 4 4 3 1 3 3 ... |
correct output |
---|
YES DDLUUURRDDDRUUU YES UUURRRDLDRDLLUU NO ... |
user output |
---|
YES DRRDLLLUUURRDRU YES RRRULLLUURRRDLL NO ... Truncated |
Test 14
Group: 5
Verdict: TIME LIMIT EXCEEDED
input |
---|
100 12 27 6 22 1 8 6 25 3 2 4 4 6 16 4 6 5 2 36 33 8 6 1 6 ... |
correct output |
---|
YES DLDDDDDRUUUURDDDDRUURDDRRULURU... |
user output |
---|
(empty) |
Test 15
Group: 3, 5
Verdict: ACCEPTED
input |
---|
100 3 12 3 5 1 4 3 20 3 19 2 19 3 34 3 9 2 9 3 38 2 15 3 15 ... |
correct output |
---|
YES RRRRRRRUULDLULDLULDLULDLDLULDL... |
user output |
---|
YES RURDRURDRURDRUULLLLLLLDLDLULDL... Truncated |
Test 16
Group: 5
Verdict: ACCEPTED
input |
---|
100 50 50 29 1 16 21 50 50 37 5 23 48 50 50 32 22 45 24 50 50 6 28 12 37 ... |
correct output |
---|
YES DDDDDDDDDDDDDDDDDDDDDRUUUUUUUU... |
user output |
---|
YES DDDDDDDDDDDDDDDDDDDDDRRRRRRRRR... Truncated |