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Huahua's Tech Road

花花酱 LeetCode 128. Longest Consecutive Sequence

Given an unsorted array of integers, find the length of the longest consecutive elements sequence.

For example,
Given [100, 4, 200, 1, 3, 2],
The longest consecutive elements sequence is [1, 2, 3, 4]. Return its length: 4.

Your algorithm should run in O(n) complexity.


花花酱 Leetcode 371. Sum of Two Integers

Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -.


[ZOJ] 3612: Median


[ZOJ] 3713: In 7-bit


花花酱 Leetcode 419. Battleships in a Board