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Given a string S, check if the letters can be rearranged so that two characters that are adjacent to each other are not the same. If possible, output 阅读全文
posted @ 2018-11-20 16:02
fatttcat
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Given a string, sort it in decreasing order based on the frequency of characters. Example 1: Example 2: Example 3: 首先用hashmap扫一遍string，统计频率。按频率排序，将ha 阅读全文
posted @ 2018-11-20 13:30
fatttcat
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Given a non-empty array of integers, every element appears twice except for one. Find that single one. Note: Your algorithm should have a linear runti 阅读全文
posted @ 2018-11-20 13:01
fatttcat
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Find the kth largest element in an unsorted array. Note that it is the kth largest element in the sorted order, not the kth distinct element. Example 阅读全文
posted @ 2018-11-20 12:22
fatttcat
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摘要：
Design a class to find the kth largest element in a stream. Note that it is the kth largest element in the sorted order, not the kth distinct element. 阅读全文
posted @ 2018-11-20 12:00
fatttcat
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Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate number must exist. 阅读全文
posted @ 2018-11-20 03:07
fatttcat
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