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第一题是简单的构造。第 个数字是 的时候总和是 ，为了凑个条件三，我们给所有数再乘 就可以了。
树状数组
线段树
组合数学
思维
dfs
二分搜索
单调栈
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Little Mishka enjoys programming. Since her birthday has just passed, her friends decided to present her with array of non-negative integers a1, a2,...