标签:style blog http color os io 2014 for
题意:给定一些任务,每个任务有e,k,e表示完成需要时间,k表示完成后消耗,为完成时间t * k,求一个顺序使得完成消耗最少
思路:贪心,知道k大的尽量早晚餐,t小的尽量早完成,所以t / k小的尽量早完成,排个序即可
代码:
#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;
const int N = 100005;
int n;
struct Q {
__int64 e, k;
} q[N];
bool cmp(Q a, Q b) {
return a.e * b.k < a.k * b.e;
}
int main() {
while (~scanf("%d", &n)) {
for (int i = 0; i < n; i++)
scanf("%I64d", &q[i].e);
for (int i = 0; i < n; i++)
scanf("%I64d", &q[i].k);
sort(q, q + n, cmp);
long long ans = 0, now = 0;
for (int i = 0; i < n; i++) {
now += q[i].e;
ans += now * q[i].k;
}
printf("%I64d\n", ans);
}
return 0;
}HDU 4882 ZCC Loves Codefires(贪心水),布布扣,bubuko.com
HDU 4882 ZCC Loves Codefires(贪心水)
标签:style blog http color os io 2014 for
原文地址:http://blog.csdn.net/accelerator_/article/details/38095723