CSES - HIIT Open 2024

Submission details
Task:	Hiitism
Sender:	Barren plateau
Submission time:	2024-11-16 13:53:20 +0200
Language:	C++ (C++17)
Status:	READY
Result:	ACCEPTED

Test results
test	verdict	time
#1	ACCEPTED	0.00 s	details
#2	ACCEPTED	0.00 s	details
#3	ACCEPTED	0.00 s	details
#4	ACCEPTED	0.00 s	details
#5	ACCEPTED	0.00 s	details
#6	ACCEPTED	0.01 s	details
#7	ACCEPTED	0.01 s	details
#8	ACCEPTED	0.03 s	details
#9	ACCEPTED	0.03 s	details
#10	ACCEPTED	0.03 s	details
#11	ACCEPTED	0.03 s	details
#12	ACCEPTED	0.02 s	details
#13	ACCEPTED	0.01 s	details
#14	ACCEPTED	0.01 s	details
#15	ACCEPTED	0.01 s	details
#16	ACCEPTED	0.02 s	details
#17	ACCEPTED	0.01 s	details
#18	ACCEPTED	0.01 s	details
#19	ACCEPTED	0.01 s	details
#20	ACCEPTED	0.02 s	details
#21	ACCEPTED	0.01 s	details
#22	ACCEPTED	0.01 s	details
#23	ACCEPTED	0.01 s	details
#24	ACCEPTED	0.01 s	details
#25	ACCEPTED	0.01 s	details
#26	ACCEPTED	0.01 s	details
#27	ACCEPTED	0.01 s	details
#28	ACCEPTED	0.01 s	details
#29	ACCEPTED	0.01 s	details
#30	ACCEPTED	0.01 s	details

Code

#include <bits/stdc++.h>
using namespace std;

using Z = long long int;
using A = array<Z, 4>;

Z n, m;
vector<string> X;
vector<A> rows;
vector<A> cols;
queue<pair<bool, Z>> Q;

bool ready(const A& a) {
    Z nz = 0;
    for(Z i = 1; i < 4; ++i) {
        if(a[i] != 0) {
            ++nz;
        }
    }
    return a[0] == 0 && nz == 1;
}

int main() {
    cin.sync_with_stdio(false);
    cin.tie(nullptr);

    cin >> n >> m;
    X.resize(n);
    for(Z i = 0; i < n; ++i) {
        cin >> X[i];
    }

    rows.resize(n);
    cols.resize(m);
    std::fill(rows.begin(), rows.end(), A{{0, 0, 0, 0}});
    std::fill(cols.begin(), cols.end(), A{{0, 0, 0, 0}});
    for(Z i = 0; i < n; ++i) {
        for(Z j = 0; j < m; ++j) {
            char c = X[i][j];
            Z x = 0;
            if(c == 'H') x = 1;
            if(c == 'I') x = 2;
            if(c == 'T') x = 3;
            ++rows[i][x];
            ++cols[j][x];
        }
    }

    for(Z i = 0; i < n; ++i) {
        if(ready(rows[i])) {
            Q.push({false, i});
        }
    }
    for(Z j = 0; j < m; ++j) {
        if(ready(cols[j])) {
            Q.push({true, j});
        }
    }

    vector<tuple<bool, Z, char>> ret;
    while(!Q.empty()) {
        auto [isCol, z] = Q.front();
        Q.pop();

        A a = isCol ? cols[z] : rows[z];
        char c = '\0';
        for(Z i = 0; i < 4; ++i) {
            if(a[i] != 0) {
                if(i == 0) c = '.';
                if(i == 1) c = 'H';
                if(i == 2) c = 'I';
                if(i == 3) c = 'T';
            }
        }
        if(c == '\0') throw 5;
        if(c == '.') throw 5;
        ret.push_back({isCol, z, c});

        if(isCol) {
            Z j = z;
            for(Z i = 0; i < n; ++i) {
                Z x = -1;
                if(X[i][j] == '.') x = 0;
                if(X[i][j] == 'H') x = 1;
                if(X[i][j] == 'I') x = 2;
                if(X[i][j] == 'T') x = 3;
                if(x != -1) {
                    bool wasReady = ready(rows[i]);
                    --rows[i][x];
                    if(!wasReady && ready(rows[i])) {
                        Q.push({false, i});
                    }
                }
                X[i][j] = 'x';
            }
            cols[j] = {0, 0, 0, 0};
        } else {
            Z i = z;
            for(Z j = 0; j < m; ++j) {
                Z x = -1;
                if(X[i][j] == '.') x = 0;
                if(X[i][j] == 'H') x = 1;
                if(X[i][j] == 'I') x = 2;
                if(X[i][j] == 'T') x = 3;
                if(x != -1) {
                    bool wasReady = ready(cols[j]);
                    --cols[j][x];
                    if(!wasReady && ready(cols[j])) {
                        Q.push({true, j});
                    }
                }
                X[i][j] = 'x';
            }
            rows[i] = {0, 0, 0, 0};
        }
    }

    bool ok = true;
    for(Z i = 0; i < n; ++i) {
        for(Z j = 0; j < m; ++j) {
            if(X[i][j] != 'x' && X[i][j] != '.') {
                ok = false;
            }
        }
    }

    if(ok) {
        std::reverse(ret.begin(), ret.end());
        cout << ret.size() << "\n";
        for(const auto& p : ret) {
            auto [isCol, z, c] = p;
            cout << (isCol ? 'C' : 'R') << " " << z + 1 << " " << c << "\n";
        }
    } else {
        cout << "Impossible\n";
    }

    return 0;
}

Test details

Test 1

Verdict: ACCEPTED

input
`3 3 .H. IHI TTT` view save

correct output
`3 R 2 I C 2 H R 3 T` view save

user output
`3 R 2 I C 2 H R 3 T` view save

Test 2

Verdict: ACCEPTED

input
`2 2 .H IH` view save

correct output
`2 R 2 I C 2 H` view save

user output
`2 R 2 I C 2 H` view save

Test 3

Verdict: ACCEPTED

input
`10 10 T.TIH..... IIIIIIIIII T.TIH..... TIIIHIIIII ...` view save

correct output
`7 C 3 T R 10 I R 4 I C 5 H ...` view save

user output
`7 C 3 T R 10 I R 4 I C 5 H ...` view save

Test 4

Verdict: ACCEPTED

input
`100 100 .............H........I.....IT...` view save

correct output
`19 R 3 T C 44 H R 34 I C 30 T ...` view save

user output
`19 R 3 T C 44 H R 34 I C 30 T ...` view save

Test 5

Verdict: ACCEPTED

input
`100 100 .........................H.......` view save

correct output
`Impossible` view save

user output
`Impossible` view save

Test 6

Verdict: ACCEPTED

input
`1000 1000 H.II..T.I.IH..I..H.I..I..ITHH....` view save

correct output
`Impossible` view save

user output
`Impossible` view save

Test 7

Verdict: ACCEPTED

input
`1000 1000 HHHIHHHHHHHHHHHHIHHHHHHHHHHHHH...` view save

correct output
`Impossible` view save

user output
`Impossible` view save

Test 8

Verdict: ACCEPTED

input
`1000 1000 IHIHTI.T.H..IHHIIT.I.TT.HH.HI....` view save

correct output
`1552 C 822 I C 83 T C 55 I R 984 H ...` view save

user output
`1552 C 822 I C 83 T C 55 I R 984 H ...` view save

Test 9

Verdict: ACCEPTED

input
`1000 1000 HHHHHHHHHHHHHHHHHHHHHIHHHHHHHH...` view save

correct output
`1727 R 500 I C 938 H C 804 H R 263 H ...` view save

user output
`1727 R 500 I C 938 H C 804 H R 263 H ...` view save

Test 10

Verdict: ACCEPTED

input
`1000 1000 TITTTHTITTHTHTHITTTTTTTHTHTTTI...` view save

correct output
`1856 C 22 H R 531 T C 412 H C 288 H ...` view save

user output
`1856 C 22 H R 531 T C 412 H C 288 H ...` view save

Test 11

Verdict: ACCEPTED

input
`1000 1000 IHHTTTTHTIIIHTTTTHTIITTTHHITIT...` view save

correct output
`1826 R 200 H R 167 I C 445 I C 355 I ...` view save

user output
`1826 R 200 H R 167 I C 445 I C 355 I ...` view save

Test 12

Verdict: ACCEPTED

input
`1000 1000 TTTTTITTTHTHTITIIHTIITIHTTIHTT...` view save

correct output
`Impossible` view save

user output
`Impossible` view save

Test 13

Verdict: ACCEPTED

input
`1000 1000 TITHITITIITTIIIIIHIIIIHTIIIHTI...` view save

correct output
`Impossible` view save

user output
`Impossible` view save

Test 14

Verdict: ACCEPTED

input
`1000 1000 TTTTTTTTTTTTTTTTTTTITTTTTTTITT...` view save

correct output
`Impossible` view save

user output
`Impossible` view save

Test 15

Verdict: ACCEPTED

input
`1000 1000 IHTHHHIHIIIHHTTHHHHIHIIHHIHHHH...` view save

correct output
`Impossible` view save

user output
`Impossible` view save

Test 16

Verdict: ACCEPTED

input
`1000 500 HIHHTHTITTHIHTHTTHIHTTIHTTHHTH...` view save

correct output
`1417 C 75 I R 430 T C 195 H R 441 I ...` view save

user output
`1417 C 75 I R 430 T C 195 H R 441 I ...` view save

Test 17

Verdict: ACCEPTED

input
`500 1000 IHIIIHIIHIIIIIHIHHIIIIIIIIIIII...` view save

correct output
`1418 C 971 T C 744 I C 654 I C 540 T ...` view save

user output
`1418 C 971 T C 744 I C 654 I C 540 T ...` view save

Test 18

Verdict: ACCEPTED

input
`1000 500 IIIIIIIIIIIIIIITIIIIIIITTIIIII...` view save

correct output
`Impossible` view save

user output
`Impossible` view save

Test 19

Verdict: ACCEPTED

input
`500 1000 HIITITHHHHIHHIHHTHIIIHHHHTHTHH...` view save

correct output
`Impossible` view save

user output
`Impossible` view save

Test 20

Verdict: ACCEPTED

input
`1000 1000 TIITIIIIIIIIIIIIIIIIIHIHIIIIII...` view save

correct output
`Impossible` view save

user output
`Impossible` view save

Test 21

Verdict: ACCEPTED

input
`1000 1000 TTHTTTTTHTTTHTTTTTTTTHHTTTTTIT...` view save

correct output
`Impossible` view save

user output
`Impossible` view save

Test 22

Verdict: ACCEPTED

input
`1000 1000 IHIIIIITHIIIHIHHHITHIIIIHTTIHI...` view save

correct output
`Impossible` view save

user output
`Impossible` view save

Test 23

Verdict: ACCEPTED

input
`1000 1000 TTHIHIITHTI.HHIHHITIHIHIHIITIH...` view save

correct output
`Impossible` view save

user output
`Impossible` view save

Test 24

Verdict: ACCEPTED

input
`1000 1000 IHIHIIIIIIIIIHIIIHIHIITIHIIIII...` view save

correct output
`Impossible` view save

user output
`Impossible` view save

Test 25

Verdict: ACCEPTED

input
`1000 500 HIHITTIHITHHHTITHIHHHTHHIHHIII...` view save

correct output
`Impossible` view save

user output
`Impossible` view save

Test 26

Verdict: ACCEPTED

input
`500 1000 HHHHHHHHHHHHHHHHHHHHHHHHHHHHHH...` view save

correct output
`Impossible` view save

user output
`Impossible` view save

Test 27

Verdict: ACCEPTED

input
`1000 500 TTTTIHTTTHTTHTITTTTHTHTTHTITTI...` view save

correct output
`Impossible` view save

user output
`Impossible` view save

Test 28

Verdict: ACCEPTED

input
`500 1000 HTIIIHIIIHITIHIIIIIIHTIIIIITHI...` view save

correct output
`Impossible` view save

user output
`Impossible` view save

Test 29

Verdict: ACCEPTED

input
`1000 1000 .................................` view save

correct output
`0` view save

user output
`0` view save

Test 30

Verdict: ACCEPTED

input
`1000 1000 .................................` view save

correct output
`1 C 562 T` view save

user output
`1 C 562 T` view save

HIIT Open 2024

Hiitism

Code

Test details

Test 1

Test 2

Test 3

Test 4

Test 5

Test 6

Test 7

Test 8

Test 9

Test 10

Test 11

Test 12

Test 13

Test 14

Test 15

Test 16

Test 17

Test 18

Test 19

Test 20

Test 21

Test 22

Test 23

Test 24

Test 25

Test 26

Test 27

Test 28

Test 29

Test 30

Tasks

Submissions (Barren plateau)