[SPOJ] NOTATRI – Not a Triangle | 书脊



[SPOJ] NOTATRI – Not a Triangle | 书脊

分析:睡前A一道. 简单的计算. 两边之和<第三边, 先排序一下数组, 然后把第三边取数组最后一个, 也是最大一个数. 然后两个指针left和right, meet in middle, 个数是 right-left, 因为每次当满足条件时, 所有在right和left中的元素, 都可以看成以当前i为第三边和当前的left为一条边时, 移动right往left靠拢,这些可能的组合, 都是满足条件的, 因为right靠谱left是一个递减的过程.


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