萌新，没怎么学算法，写了一段自认为全错的代码，结果全AZ了，求大佬指教，代码如下：

#include<iostream>
using namespace std;
int main() {
	int v, n, weight[31], what[31], sum = 0;
	cin >> v >> n;
	for (int i = 1; i <= n; i++) {
		cin >> weight[i];
		sum += weight[i];
		what[i] = 1;
	}
	for (int i = 1; i <= n; i++) {
		if (sum > v) {
			sum -= weight[i];
			what[i] = 0;
		}
		for (int j = 1; j <= n && j != i; j++) {
			if (what[j] == 0 && sum + weight[j] <= v) {
				sum += weight[j];
			}
		}
	}
	cout << v - sum << endl;
	return 0;
}