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题目:The Skyline Problem A city's skyline is the outer contour of the silhouette formed by all the buildings in that city when viewed from a distance. N 阅读全文
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题目:Self Crossing You are given an array x of n positive numbers. You start at point (0,0) and moves x[0] metres to the north, then x[1] metres to the 阅读全文
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题目:Increasing Triplet Subsequence Given an unsorted array return whether an increasing subsequence of length 3 exists or not in the array. Formally th 阅读全文