CSES - Datatähti 2023 alku - Results
Submission details
Task:Ruudukko
Sender:chaotic
Submission time:2022-11-02 17:17:29 +0200
Language:C++ (C++17)
Status:READY
Result:100
Feedback
groupverdictscore
#1ACCEPTED28
#2ACCEPTED33
#3ACCEPTED39
Test results
testverdicttimegroup
#1ACCEPTED0.00 s1, 2, 3details
#2ACCEPTED0.00 s1, 2, 3details
#3ACCEPTED0.00 s1, 2, 3details
#4ACCEPTED0.01 s2, 3details
#5ACCEPTED0.01 s2, 3details
#6ACCEPTED0.01 s2, 3details
#7ACCEPTED0.17 s3details
#8ACCEPTED0.72 s3details
#9ACCEPTED0.62 s3details

Code

#include <algorithm>
#include <cassert>
#include <cmath>
#include <iostream>
#include <numeric>
#include <vector>
using ll = long long;
ll mod = 1000000000 + 7;
// ll mod = 2;
struct Index {
ll value;
int idx;
};
class Sums {
public:
Sums(ll n_): n(n_) {
rowsum.resize(n, 0);
colsum.resize(n, 0);
}
ll size() const { return n; }
static ll do_mod(ll x) {
if (x >= mod) x %= mod;
return x;
}
ll sum_at(ll row, ll col) { return (rowsum[row] + colsum[col]) % mod; }
ll sum_at(ll i) { return sum_at(i / n, i % n); }
ll n;
std::vector<ll> rowsum; // jokaisen rivin summa
std::vector<ll> colsum; // jok. kolumnin summa
};
struct Array {
public:
Array(ll n_): n(n_) { array.resize(n * n, 0); }
ll& operator()(ll row, ll col) { return array[row * n + col]; }
ll& operator[](ll i) { return array[i]; }
ll operator[](ll i) const { return array[i]; }
ll size() const { return n; }
const ll n;
std::vector<ll> array;
};
Array read_input() {
ll n;
std::cin >> n;
Array array{ n };
for (ll i = 0; i < n * n; ++i) {
ll v;
std::cin >> v;
array[i] = v;
}
return array;
}
auto create_indices(Array const& array) {
std::vector<Index> indices;
const int n2 = array.size() * array.size();
indices.reserve(n2);
for (int i = 0; i < n2; ++i) { indices.push_back({ array[i], i }); }
std::sort(indices.begin(), indices.end(), [](Index a, Index b) { return a.value < b.value; });
return indices;
}
int main() {
std::cin.sync_with_stdio(false);
auto array = read_input();
// Array array(2);
// array.array = { 1, 2, 3, 4 };
const auto indices = create_indices(array);
Sums sums(array.size());
ll res = 0;
const ll n2 = array.size() * array.size();
ll i = 0;
ll cur_val = 0;
while (i < n2) {
auto tmp_sums = sums;
while (indices[i].value == cur_val) {
ll idx = indices[i].idx;
ll row = idx / array.size();
ll col = idx % array.size();
res += 1 + sums.rowsum[row] + sums.colsum[col];
tmp_sums.rowsum[row] += 1 + sums.rowsum[row] + sums.colsum[col];
tmp_sums.colsum[col] += 1 + sums.colsum[col] + sums.rowsum[row];
res %= mod;
tmp_sums.rowsum[row] %= mod;
tmp_sums.colsum[col] %= mod;
++i;
//
}
sums = std::move(tmp_sums);
cur_val = indices[i].value;
}
std::cout << res << "\n";
}

Test details

Test 1

Group: 1, 2, 3

Verdict: ACCEPTED

input
3
1 1 1
1 1 1
1 1 1

correct output
9

user output
9

Test 2

Group: 1, 2, 3

Verdict: ACCEPTED

input
3
1 2 3
6 5 4
7 8 9

correct output
135

user output
135

Test 3

Group: 1, 2, 3

Verdict: ACCEPTED

input
3
7 8 1
4 5 4
3 9 6

correct output
57

user output
57

Test 4

Group: 2, 3

Verdict: ACCEPTED

input
100
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...

correct output
10000

user output
10000

Test 5

Group: 2, 3

Verdict: ACCEPTED

input
100
1 2 3 4 5 6 7 8 9 10 11 12 13 ...

correct output
187458477

user output
187458477

Test 6

Group: 2, 3

Verdict: ACCEPTED

input
100
2995 8734 1018 2513 7971 5063 ...

correct output
964692694

user output
964692694

Test 7

Group: 3

Verdict: ACCEPTED

input
1000
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...

correct output
1000000

user output
1000000

Test 8

Group: 3

Verdict: ACCEPTED

input
1000
1 2 3 4 5 6 7 8 9 10 11 12 13 ...

correct output
229147081

user output
229147081

Test 9

Group: 3

Verdict: ACCEPTED

input
1000
520283 805991 492643 75254 527...

correct output
951147313

user output
951147313