代码：

#include <bits/stdc++.h>
using namespace std;
long long n, m, p[1001], c[1001], cnt[1001];
vector<int>cs[1001];
long long ans = 1e18;

long long f(int num) {
	long long cur = cnt[1], res = 0;
	vector<int>tmp;
	for (int i = 2; i <= n; i++) {
		int b = max(int(cs[i].size() - num + 1), 0);
		for (int j = 0; j < b; j++) {
			res += cs[i][j];
		}
		cur += b;
		for (int j = b; j < cs[i].size(); j++) {
			tmp.push_back(cs[i][j]);
		}
	}
	sort(tmp.begin(), tmp.end());
	for (int i = 0; i < num - cur; i++) {
		res += tmp[i];
	}
	return res;
}

int main() {
	cin >> n >> m;
	for (int i = 1; i <= m; i++) {
		cin >> p[i] >> c[i];
		cnt[p[i]]++;
		cs[p[i]].push_back(c[i]);
	}
	for (int i = 1; i <= n; i++) {
		sort(cs[i].begin(), cs[i].end());
	}
	for (int i = max((int)(cnt[1]), 111); i <= m; i++) {
		ans = min(ans, f(i));
	}
	cout << ans << endl;
}

提交记录:https://www.luogu.com.cn/record/194716683 (疑似你谷新bug) (@niuniudundun,我参考了你的代码，为什么还是没AC？)