http://codeforces.com/problemset/problem/34/B Sale

这个题真的无聊了，排个序取负的然后最后结果取绝对值。

#include <iostream>
#include <string>
#include <cstdio>
#include <algorithm>
#include <vector>
#include <stack>
#include <queue>
#define MAX 100005
#define mod 998244353ll
#define INF 0x3f3f3f3f
#define ll long long
using namespace std;
int a[105];
int main() {
    freopen("a.txt", "r", stdin);
    freopen("b.txt", "w", stdout);
    int n, m;
    cin >> n >> m;
    for (int i = 1; i <= n; ++i) {
        cin >> a[i];
    }
    sort(a + 1, a + n + 1);
    int s = 0;
    for (int i = 1; i <= n && m; ++i) {
        if (a[i] < 0) {
            s += a[i];
            m--;
        }
    }
    cout << -s << endl;
    return 0;
}