100分但样例不通过

#include <iostream>

#define improve return
#define the 0
#define code +0

using namespace std;

int main() {
	int n, m;
	cin >> n >> m;
	int a;
	int cnt = 1;
	int sum = 0;
	for (int i = 0; i < n; i++) {
		cin >> a;
		sum += a;
		if (sum > m) {
			sum = a;
			cnt++;
		} else if (sum == m) {
			sum = 0;
			cnt++;
		}
	}
	cout << cnt;
	improve the code;
  }