Ruudukko

#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#define M 1000000007;
using namespace std;

int d = 0;

int vals[1000][1000];
//int vals2[1000][1000];
int rowChains[1000];
int prevRowChains[1000];
int colChains[1000];
int prevColChains[1000];
int totalChains = 0;
vector<pair<int, pair<int, int>>> orderTiles;


int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    
    //ifstream f("file.txt");
    
    cin >> d;
    //auto start = chrono::system_clock::now();
    
    int i, j;
    for (i = 0; i < d; ++i) {
        for (j = 0; j < d; ++j) {
            cin >> vals[i][j];
            orderTiles.push_back({/*vals2[j][i] = */vals[i][j], {i, j}});
        }
    }
    
    sort(orderTiles.begin(), orderTiles.end());
    //pair<int, pair<int, int>> p;
    int chainsFromThis, a, b, c;
    
    //auto stop1 = chrono::system_clock::now();
    //chrono::duration<double> time1 = stop1 - start;
    //cout << "\nmidtime: " << time1.count() << "\n";
    
    int prev = 0;
    for (i = 0; i < d * d; ++i) {
        //p = orderTiles[i];
        a = orderTiles[i].second.first;
        b = orderTiles[i].second.second;
        c = orderTiles[i].first;
        
        if (c > prev) {
            copy(rowChains, rowChains + 1000, prevRowChains);
            copy(colChains, colChains + 1000, prevColChains);
        }
        
        chainsFromThis = (1 + prevRowChains[a] + prevColChains[b]) % M;
        totalChains = (totalChains + chainsFromThis) % M;
        
        rowChains[a] = (rowChains[a] + chainsFromThis) % M;
        colChains[b] = (colChains[b] + chainsFromThis) % M;
        
        prev = c;
    }
    
    /*for (int i = 0; i < d; ++i) {
        cout << '\n';
        for (int j = 0; j < d; ++j) {
            cout << chains[i][j] << ' ';
        }
    }*/
    
    cout << "\n" << totalChains;
    //auto stop2 = chrono::system_clock::now();
    //chrono::duration<double> time2 = stop2 - start;
    //cout << "\ntime: " << time2.count();
}

Test 1

Group: 1, 2, 3

Verdict: ACCEPTED

Test 2

Group: 1, 2, 3

Verdict: ACCEPTED

Test 3

Group: 1, 2, 3

Verdict: ACCEPTED

Test 4

Group: 2, 3

Verdict: ACCEPTED

Test 5

Group: 2, 3

Verdict: ACCEPTED

Test 6

Group: 2, 3

Verdict: ACCEPTED

Test 7

Group: 3

Verdict: ACCEPTED

Test 8

Group: 3

Verdict: ACCEPTED

Test 9

Group: 3

Verdict: ACCEPTED