#include <iostream>
using namespace std;
int main() {
int arr[] = {15, -2, 2, -8, 1, 7, 10 };
int n = 7;
int maxlength = 0;
for(int i = 0; i < n; i++) {
int sum = 0;
for(int j = i; j < n; j++) {
sum += arr[j];
if(sum == 0) {
maxlength = max(maxlength, j - i + 1);
}
}
}
cout << maxlength << endl;
return 0;
}
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