Simplified Sudoku

input/code.cpp: In function 'int main()':
input/code.cpp:11:5: warning: 'm' may be used uninitialized in this function [-Wmaybe-uninitialized]
   m +=q;
   ~~^~~

#include <iostream>
#include <vector>
using namespace std;
int main (){
	int n;
	int m;
	int f;
	cin >> n;
	vector<vector<int>> grid;
	for (int q = 1;q <= n;q++){
		m +=q;
	}
	for (int i = 0;i < n;i++){
		f = 0;
		for (int j = 0;j < n;j++){
			cin >> grid[i][j];
			f += m;
		}
		if (f != m) {
			cout << "NO";
		}
	}
}

Test 1

Verdict: RUNTIME ERROR

Test 2

Verdict: RUNTIME ERROR

Test 3

Verdict: RUNTIME ERROR

Test 4

Verdict: RUNTIME ERROR

Test 5

Verdict: RUNTIME ERROR

Test 6

Verdict: RUNTIME ERROR

Test 7

Verdict: RUNTIME ERROR

Test 8

Verdict: RUNTIME ERROR

Test 9

Verdict: RUNTIME ERROR

Test 10

Verdict: RUNTIME ERROR