Schwifty - 博客园

2020年3月12日

摘要： There is a room with n lights which are turned on initially and 4 buttons on the wall. After performing exactly m unknown operations towards buttons, 阅读全文

posted @ 2020-03-12 13:43 Schwifty 阅读(134) 评论(0) 推荐(0)

1375. Bulb Switcher III

摘要： There is a room with n bulbs, numbered from 1 to n, arranged in a row from left to right. Initially, all the bulbs are turned off. At moment k (for k 阅读全文

posted @ 2020-03-12 13:12 Schwifty 阅读(384) 评论(0) 推荐(0)

1376. Time Needed to Inform All Employees

摘要： A company has n employees with a unique ID for each employee from 0 to n - 1. The head of the company has is the one with headID. Each employee has on 阅读全文

posted @ 2020-03-12 04:57 Schwifty 阅读(224) 评论(0) 推荐(0)

1372. Longest ZigZag Path in a Binary Tree

摘要： Given a binary tree root, a ZigZag path for a binary tree is defined as follow: Choose any node in the binary tree and a direction (right or left). If 阅读全文

posted @ 2020-03-12 01:38 Schwifty 阅读(525) 评论(0) 推荐(0)

1374. Generate a String With Characters That Have Odd Counts

摘要： Given an integer n, return a string with n characters such that each character in such string occurs an odd number of times. The returned string must 阅读全文

posted @ 2020-03-12 00:16 Schwifty 阅读(471) 评论(0) 推荐(0)

2020年3月11日

371. Find the Longest Substring Containing Vowels in Even Counts

摘要： Given the string s, return the size of the longest substring containing each vowel an even number of times. That is, 'a', 'e', 'i', 'o', and 'u' must 阅读全文

posted @ 2020-03-11 08:36 Schwifty 阅读(271) 评论(0) 推荐(0)

1370. Increasing Decreasing String

摘要： Given a string s. You should re-order the string using the following algorithm: Pick the smallest character from s and append it to the result. Pick t 阅读全文

posted @ 2020-03-11 07:57 Schwifty 阅读(352) 评论(0) 推荐(0)

2020年3月2日

1366. Rank Teams by Votes

摘要： In a special ranking system, each voter gives a rank from highest to lowest to all teams participated in the competition. The ordering of teams is dec 阅读全文

posted @ 2020-03-02 11:10 Schwifty 阅读(619) 评论(0) 推荐(0)

2020年2月27日

1361. Validate Binary Tree Nodes

摘要： You have n binary tree nodes numbered from 0 to n - 1 where node i has two children leftChild[i] and rightChild[i], return true if and only if all the 阅读全文

posted @ 2020-02-27 11:46 Schwifty 阅读(250) 评论(0) 推荐(0)

2020年2月25日

1359. Count All Valid Pickup and Delivery Options

摘要： Given n orders, each order consist in pickup and delivery services. Count all valid pickup/delivery possible sequences such that delivery(i) is always 阅读全文

posted @ 2020-02-25 12:09 Schwifty 阅读(380) 评论(0) 推荐(0)

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