BZOJ 3253 Fence Repair 哈夫曼树 水题

http://poj.org/problem?id=3253

这道题约等于合并果子，但是通过这道题能够看出来哈夫曼树是什么了。

 1 #include<cstdio>
 2 #include<cstring>
 3 #include<algorithm>
 4 #include<cmath>
 5 #include<iostream>
 6 #include<queue>
 7 using namespace std;
 8 #define LL long long
 9 const int maxn=300010;
10 int n;
11 priority_queue< LL,vector<LL>,greater< LL > >q;
12 int main(){
13     while(~scanf("%d",&n)){
14         LL x,y;
15         for(int i=1;i<=n;i++){scanf("%lld",&x);q.push(x);}
16         LL ans=0;
17         while(!q.empty()){
18             x=q.top();q.pop();
19             if(q.empty())continue;
20             y=q.top();q.pop();
21             ans+=x+y;
22             q.push(x+y);
23         }
24         printf("%lld\n",ans);
25         while(!q.empty())q.pop();
26     }
27     return 0;
28 }

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