原创 vetor, list, map, set的區別
List封裝了鏈表,Vector封裝了數組, list和vector得最主要的區別在於vector使用連續內存存儲的，他支持[]運算符，而list是以鏈表形式實現的，不支持[]。 Vector對於隨機訪問的速度很快，但是對於插入
2020-06-25 21:06:12
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原创 【leetcode】Count and Say
Count and Say The count-and-say sequence is the sequence of integers beginning as follows: 1, 11, 21, 1211, 111221
2020-06-25 21:06:12
原创 【leetcode】House Robber II
House Robber II Note: This is an extension of House Robber. After robbing those houses on that street, the thief h
2020-06-25 21:06:12
原创 【leetcode】Subsets 1&2
Subsets Given a set of distinct integers, nums, return all possible subsets. Note: • Elements in a subset must
2020-06-07 19:33:13
原创 【leetcode】Jump Game II
Jump Game II Given an array of non-negative integers, you are initially positioned at the first index of the array.
2020-02-21 08:35:56
原创 【leetcode】Sqrt(x)
Sqrt(x) Implement int sqrt(int x). Compute and return the square root of x. 思路： 如果不知道二分之後左右的取法的話，可以找個實例進行推測。 cla
2020-02-21 08:35:56
原创 【leetcode】Unique Paths II
Unique Paths II Follow up for “Unique Paths”: Now consider if some obstacles are added to the grids. How many un
2020-02-21 08:35:56
原创 【leetcode】Longest Consecutive Sequence
Longest Consecutive Sequence Given an unsorted array of integers, find the length of the longest consecutive elemen
2020-02-21 08:35:56
原创 【leetcode】Reverse Linked List II
Reverse Linked List II Reverse a linked list from position m to n. Do it in-place and in one-pass. For example: G
2020-02-21 08:35:56
原创 【leetcode】Combination Sum
Combination Sum Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C whe
2020-02-21 08:35:56
原创 【leetcode】Combination Sum II
Combination Sum II Given a collection of candidate numbers (C) and a target number (T), find all unique combination
2020-02-21 08:35:56
原创 【leetcode】Pow(x, n)
Pow(x, n) Implement pow(x, n). 思路： 思路就是遞歸，用簡單遞歸的方法是O(n)的複雜度，但是如果二分之後再遞歸，複雜度爲O(lg(n))。但是一定注意leetcode有個極限值-21474836
2020-02-21 08:35:56
原创 【leetcode】Path Sum II
Path Sum II Given a binary tree and a sum, find all root-to-leaf paths where each path’s sum equals the given sum.
2020-02-21 08:35:56
原创 【leetcode】Multiply Strings
Multiply Strings Given two numbers represented as strings, return multiplication of the numbers as a string. Note:
2020-02-21 08:35:56
原创 【leetcode】Contains Duplicate
Contains Duplicate Given an array of integers, find if the array contains any duplicates. Your function should retu
2020-02-21 08:35:56