Ruudukko

#include <bits/stdc++.h>
using namespace std;
 
int main(){
    int size;
    cin >> size;
 
    short grid[size][size] = {0};
    vector<set<short>> rivit(size-1);
    vector<set<short>> sarakkeet(size-1);
 
    for(int i = 0; i < size; i++){
        grid[i][0] = i+1;
        grid[0][i] = i+1;
        if(i > 0) {
            set<short> temp;
            temp.insert(i + 1);
            temp.insert(1);
            rivit[i-1] = temp;
            sarakkeet[i-1] = temp;
        }
    }
 
    for(int i = 1; i < size; i++){
        grid[i][i] = 1;
        for(int p = i+1; p < size; p++){
            int x1 = i;
            int y1 = p;
 
            int x2 = p;
            int y2 = i;
 
 
            for(int n = 1; n <= size*2; n++){
                if(sarakkeet[x1-1].find(n) == sarakkeet[x1-1].end() && rivit[y1-1].find(n) == rivit[y1-1].end()){
                    grid[y1][x1] = n;
                    sarakkeet[x1-1].insert(n);
                    rivit[y1-1].insert(n);
                    break;
                }
            }
            for(int n = 1; n <= size*2; n++){
                if(sarakkeet[x2-1].find(n) == sarakkeet[x2-1].end() && rivit[y2-1].find(n) == rivit[y2-1].end()){
                    grid[y2][x2] = n;
                    sarakkeet[x2-1].insert(n);
                    rivit[y2-1].insert(n);
                    break;
                }
            }
        }
    }
 
 
 
    for(int y = 0; y < size; y++){
        for(int x = 0; x < size; x++){
            cout << grid[y][x] << " ";
        }
        cout << endl;
    }
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED