POJ 3253: Fence Repair

 1 #include <stdio.h>
 2 #include <queue>
 3 #include <functional>
 4 using namespace std;
 5 
 6 priority_queue<int, vector<int>, greater<int> > q;    //优先队列
 7 
 8 
 9 int main()
10 {
11     int n;
12     while (scanf("%d", &n) != EOF)
13     {
14         while (!q.empty())
15             q.pop();
16 
17         for (int i = 0; i < n; i++)
18         {
19             int x;
20             scanf("%d", &x);
21             q.push(x);
22         }
23 
24         long long ans = 0;        //结果可能很大
25         while (q.size()>1)
26         {
27             int a = q.top();    //最小值
28             q.pop();
29             int b = q.top();    //次小值
30             q.pop();
31 
32             int t = a + b;
33             ans += t;            //结果
34 
35             q.push(t);        //合并值重新入队
36         }
37 
38         printf("%lld\n", ans);
39     }
40 
41     return 0;
42 }