北叶青藤

2021年3月12日

摘要： Given a string s and a list of strings dict, you need to add a closed pair of bold tag <b> and </b> to wrap the substrings in s that exist in dict. If 阅读全文

posted @ 2021-03-12 11:26 北叶青藤阅读(67) 评论(0) 推荐(0) 编辑

981. Time Based Key-Value Store

摘要： Create a timebased key-value store class TimeMap, that supports two operations. 1. set(string key, string value, int timestamp) Stores the key and val 阅读全文

posted @ 2021-03-12 09:40 北叶青藤阅读(77) 评论(0) 推荐(0) 编辑

1570. Dot Product of Two Sparse Vectors

摘要： Given two sparse vectors, compute their dot product. Implement class SparseVector: SparseVector(nums) Initializes the object with the vector nums dotP 阅读全文

posted @ 2021-03-12 05:53 北叶青藤阅读(480) 评论(0) 推荐(0) 编辑

2021年3月11日

443. String Compression

摘要： Given an array of characters chars, compress it using the following algorithm: Begin with an empty string s. For each group of consecutive repeating c 阅读全文

posted @ 2021-03-11 02:23 北叶青藤阅读(42) 评论(0) 推荐(0) 编辑

2021年3月7日

Binary Search 相关的case

摘要： Case 1: 在一个sorted array里面找出target value的 index，如果target value 出现了多次，返回任何一个就可以了。 Cas 2: Find the smallest number which is greater than the target Case 阅读全文

posted @ 2021-03-07 10:03 北叶青藤阅读(50) 评论(0) 推荐(0) 编辑

1428. Leftmost Column with at Least a One

摘要： (This problem is an interactive problem.) A row-sorted binary matrix means that all elements are 0 or 1 and each row of the matrix is sorted in non-de 阅读全文

posted @ 2021-03-07 09:40 北叶青藤阅读(84) 评论(0) 推荐(0) 编辑

2021年3月5日

phone keypad combination

摘要：给一个phone pad mapping like: {1，{‘A’,'B' , 'C'}}, {2, { 'D' , 'E' , 'F' }} ... {0， {'X', 'Y', 'Z'}}. 按一次1 返回A，连续两次返回B，连续四次重新返回A. 输入一组数字，不清楚之间间隔，返回所有可能的阅读全文

posted @ 2021-03-05 00:56 北叶青藤阅读(78) 评论(0) 推荐(0) 编辑

2021年3月3日

1498. Number of Subsequences That Satisfy the Given Sum Condition

摘要： Given an array of integers nums and an integer target. Return the number of non-empty subsequences of nums such that the sum of the minimum and maximu 阅读全文

posted @ 2021-03-03 00:16 北叶青藤阅读(236) 评论(0) 推荐(0) 编辑

2020年12月27日

653. Two Sum IV - Input is a BST

摘要： Given the root of a Binary Search Tree and a target number k, return true if there exist two elements in the BST such that their sum is equal to the g 阅读全文

posted @ 2020-12-27 03:43 北叶青藤阅读(87) 评论(0) 推荐(0) 编辑

567. Permutation in String

摘要： Given two strings s1 and s2, write a function to return true if s2 contains the permutation of s1. In other words, one of the first string's permutati 阅读全文

posted @ 2020-12-27 03:24 北叶青藤阅读(69) 评论(0) 推荐(0) 编辑

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