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Hello. I get WA with my code and i don't know why. Can you help me?

#include <iostream>

using namespace std;

int main() {
long long M[110][110];
int T;
cin >> T;
for(int cas = 1; cas <= T; cas++) {
char a, b;
int N;
cin >> a >> b >> N;

if(N <= 0)
continue;

for(int i = 0; i < N; i ...