hdu 3794 Magic Coupon

 1 #include<iostream>
 2 #include<cstring>
 3 #include<cstdio>
 4 #include<string>
 5 #include<cmath>
 6 #include<algorithm>
 7 using namespace std;
 8 #define MAX 1000000
 9 __int64 c[MAX+5];
10 __int64 p[MAX+5];
11 __int64 nc,np;
12 int main()
13 {
14     //freopen("INPUT.txt", "r", stdin);
15     while(cin>>nc&&nc>=0){
16         __int64 i=0;
17         for(;i<nc;i++){
18             scanf("%I64d",&c[i]);
19         }
20         cin>>np;
21         i=0;
22         for(;i<np;i++){
23             scanf("%I64d",&p[i]);
24         }
25         sort(c,c+nc);
26         sort(p,p+np);
27         i=0;
28         __int64 sum=0;
29         while(c[i]<0&&p[i]<0&&i<nc&&i<np){
30             sum+=c[i]*p[i];
31             i++;
32         }
33         __int64 cc=nc-1;
34         __int64 pp=np-1;
35         while(c[cc]>0&&p[pp]>0&&cc>=0&&pp>=0){
36             sum+=c[cc]*p[pp];
37             cc--;
38             pp--;
39         }
40         printf("%I64d\n",sum);
41     }
42     return 0;
43 }