2486: Nice Trick
时间限制: 10 Sec 内存限制: 128 MB提交: 4 解决: 2
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题目描述
输入
The input contains zero or more test cases and is terminated by end-of-file. For each test case,
The first line contains an integer n.
The second line contains n integers a1, a2, . . . , an.
• 1≤n≤105
• 0 ≤ ai ≤109
• The number of tests cases does not exceed 10.
The first line contains an integer n.
The second line contains n integers a1, a2, . . . , an.
• 1≤n≤105
• 0 ≤ ai ≤109
• The number of tests cases does not exceed 10.
输出
For each case, output an integer which denotes the result.
样例输入
3
1 2 3
4
1 2 3 4
5
1 2 3 4 5样例输出
0
24
274