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George took sticks of the same length and cut them randomly until all parts became at most 50 units long. Now he wants to return sticks to the origina 阅读全文
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A problem that is simple to solve in one dimension is often much more difficult to solve in more than one dimension. Consider satisfying a boolean exp 阅读全文
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Given three strings, you are to determine whether the third string can be formed by combining the characters in the first two strings. The first two s 阅读全文
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##题意 给出一列士兵的身高（会有重复），要求求出剔除最少士兵使得每一个士兵往左或者右看可以看到该队列的尽头士兵，原有的位置不得改变。 ##注意 不能直接排序去剔除除去最高士兵以外有重复的元素，因为题目要求原来的队列顺序不变。 A soldier see an extremity if there 阅读全文
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Description A palindrome is a symmetrical string, that is, a string read identically from left to right as well as from right to left. You are to writ 阅读全文
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n sprinklers are installed in a horizontal strip of grass l meters long and w meters wide. Each sprinkler is installed at the horizontal center line o 阅读全文