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There are n cities connected by m flights. Each flight starts from city u and arrives at v with a price w. Now given all the cities and flights, toget 阅读全文
posted @ 2021-04-05 07:05
北叶青藤
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Given a matrix of integers A with R rows and C columns, find the maximum score of a path starting at [0,0] and ending at [R-1,C-1]. The score of a pat 阅读全文
posted @ 2021-03-31 22:35
北叶青藤
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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 @ 2021-03-29 06:23
北叶青藤
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Given an array nums containing n distinct numbers in the range [0, n], return the only number in the range that is missing from the array. Follow up: 阅读全文
posted @ 2021-03-29 06:09
北叶青藤
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Given a binary search tree, return a balanced binary search tree with the same node values. A binary search tree is balanced if and only if the depth 阅读全文
posted @ 2021-03-29 05:43
北叶青藤
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Given a non-negative integer, you could swap two digits at most once to get the maximum valued number. Return the maximum valued number you could get. 阅读全文
posted @ 2021-03-29 05:18
北叶青藤
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Given a string S of '(' and ')' parentheses, we add the minimum number of parentheses ( '(' or ')', and in any positions ) so that the resulting paren 阅读全文
posted @ 2021-03-29 05:13
北叶青藤
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Given a robot cleaner in a room modeled as a grid. Each cell in the grid can be empty or blocked. The robot cleaner with 4 given APIs can move forward 阅读全文
posted @ 2021-03-29 04:32
北叶青藤
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Given an integer array nums which is sorted in ascending order and all of its elements are unique and given also an integer k, return the kth missing 阅读全文
posted @ 2021-03-29 02:33
北叶青藤
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You need to construct a binary tree from a string consisting of parenthesis and integers. The whole input represents a binary tree. It contains an int 阅读全文
posted @ 2021-03-29 01:11
北叶青藤
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