Revise paste Untitled

#include <iostream>
#include <queue>
#include <algorithm>
using namespace std;

int main()
{
    int n, m;
    cin >> n >> m;
    int mat[n][m];
    vector<pair<int, pair<int, int>>> v;
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < m; j++) {
            cin >> mat[i][j];
            v.push_back(make_pair(mat[i][j], make_pair(i, j)));
        }
    }
    sort(v.begin(), v.end());
    bool visited[n][m];
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < m; j++) {
            visited[i][j] = false;
        }
    }
    int di[] = {-1, 1, 0, 0};
    int dj[] = {0, 0, -1, 1};
    int robotcinja = 0;

for(int i = 0; i < v.size(); i++) {
        int x = v[i].second.first;
        int y = v[i].second.second;
        if(!visited[x][y]) {
            queue<int> q;
            q.push(x);
            q.push(y);

visited[x][y] = true;
            robotcinja++;
            while(!q.empty()) {
                int ci = q.front();
                q.pop();
                int cj = q.front();
                q.pop();

for(int k = 0; k < 4; k++) {
                    int ti = ci + di[k];
                    int tj = cj + dj[k];
                    if(ti >= 0 and ti < n and tj >= 0 and tj < m and !visited[ti][tj]) {
                        if(mat[ci][cj] <= mat[ti][tj]) {
                            q.push(ti);
                            q.push(tj);
                            visited[ti][tj] = true;
                        }
                    }
                }

}
        }
    }
cout << robotcinja << endl;
    return 0;
}