hdu 4882 ZCC Loves Codefires（贪心）

# include<stdio.h># include <algorithm># include <string.h>using namespace std;struct node{    int v;    int t;};struct node a[100010];bool cmp(node a,node b){    return  a.v *a.t+(a.v+b.v)*b.t<b.v*b.t+(a.v+b.v)*a.t;}int main(){    int n;    __int64 sum;    int i;    while(~scanf("%d",&n))    {                for(i=0;i<n;i++)            scanf("%d",&a[i].v);        for(i=0;i<n;i++)            scanf("%d",&a[i].t);        sort(a,a+n,cmp);        __int64 sum1=0;        sum=0;        for(i=0;i<n;i++)        {            sum = (a[i].v+sum);            sum1+=sum*a[i].t;        }        printf("%I64d\n",sum1);    }    return 0;}