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On a plane there are n points with integer coordinates points[i] = [xi, yi]. Your task is to find the minimum time in seconds to visit all points. You 阅读全文
posted @ 2019-11-27 04:27
Schwifty
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You have a lock in front of you with 4 circular wheels. Each wheel has 10 slots: '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'. The wheels can rota 阅读全文
posted @ 2019-11-26 09:19
Schwifty
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Given an Iterator class interface with methods: next() and hasNext(), design and implement a PeekingIterator that support the peek() operation -- it e 阅读全文
posted @ 2019-11-24 03:50
Schwifty
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Given a sorted integer array without duplicates, return the summary of its ranges. Example 1: Input: [0,1,2,4,5,7] Output: ["0->2","4->5","7"] Explana 阅读全文
posted @ 2019-11-23 02:28
Schwifty
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Given a 2D board and a list of words from the dictionary, find all words in the board. Each word must be constructed from letters of sequentially adja 阅读全文
posted @ 2019-11-22 10:06
Schwifty
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Implement a basic calculator to evaluate a simple expression string. The expression string contains only non-negative integers, +, -, *, / operators a 阅读全文
posted @ 2019-11-22 07:04
Schwifty
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Write a SQL query to find all numbers that appear at least three times consecutively. + + + | Id | Num | + + + | 1 | 1 | | 2 | 1 | | 3 | 1 | | 4 | 2 | 阅读全文
posted @ 2019-11-22 02:56
Schwifty
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Given a positive integer, return its corresponding column title as appear in an Excel sheet. For example: 1 -> A 2 -> B 3 -> C ... 26 -> Z 27 -> AA 28 阅读全文
posted @ 2019-11-22 02:47
Schwifty
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Given a string which contains only lowercase letters, remove duplicate letters so that every letter appears once and only once. You must make sure you 阅读全文
posted @ 2019-11-22 00:13
Schwifty
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Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1's in their binary representation and r 阅读全文
posted @ 2019-11-21 14:09
Schwifty
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