摘要：
Give you an integer array (index from 0 to n-1, where n is the size of this array, value from 0 to 10000) . For each element Ai in the array, count th 阅读全文
摘要：
Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. 阅读全文
摘要：
Given n non-negative integers a1, a2, ..., an , where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two endp 阅读全文
摘要：
Count how many 1 in binary representation of a 32-bit integer. Count how many 1 in binary representation of a 32-bit integer. Count how many 1 in bina 阅读全文
摘要：
Given an integer array (index from 0 to n-1, where n is the size of this array), and an query list. Each query has two integers [start, end]. For each 阅读全文
摘要：
Insert Intervals Given a non-overlapping interval list which is sorted by start point. Insert a new interval into it, make sure the list is still in o 阅读全文
摘要：
Find the kth smallest number in at row and column sorted matrix. Example Given k = 4 and a matrix: [ [1 ,5 ,7], [3 ,7 ,8], [4 ,8 ,9], ] return 5. 分析： 阅读全文