这个代码为什么通过不了，菜鸟求助~

#include <iostream>
using namespace std;

int main() {
    int N, sum = 0;
    cin >> N;
    int a[205];

    for (int i = 1; i <= 205; i++) {

    cin >> a[i];

    if (a[i] == 0) {
    break;
    }

    if (i % 2 != 0 && a[i] != 0) {
    for (int j = 1; j <= a[i]; j++) {

    cout << "0";
    sum++;
    if (sum == N) {
    cout << endl;
    sum = 0;
                }
            }                   
     } else if (i % 2 == 0 && a[i] != 0) {
    for (int k = 1; k <= a[i]; k++) {

    cout << "1";
    sum++;

    if (sum == N) {
    cout << endl;
    sum = 0;
    }
    }
    }

    }

    return 0;
}