#include <bits/stdc++.h>
using namespace std;
const int N = 50010;
typedef long long LL;
int  s, d;
int a[N], b[N];
LL  f[N];

int main() {
	cin >> s >> d;
	for (int i = 1; i <= s; i++) {
		cin >> a[i] >> b[i];
for (int j = b[i]; j <= d; j++)
f[j] = max(f[j], f[j - b[i]] + a[i]);
	}
	int t = 0;
	while (f[t] < d)
		t++;
	cout << t;
}

为什么5，6，10测试点会RE呢 不懂欸