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Description: Count the number of prime numbers less than a non-negative number, n click to show more hints. References: How Many Primes Are There? Sie 阅读全文
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A binary watch has 4 LEDs on the top which represent the hours (0-11), and the 6 LEDs on the bottom represent the minutes (0-59). Each LED represents 阅读全文
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Convert a non-negative integer to its english words representation. Given input is guaranteed to be less than 231 - 1. Example 1: Example 2: Example 3 阅读全文
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What happens when you type an URL in the browser and press enter? 1. You type maps.google.com into the address bar of your browser. 2. The browser che 阅读全文
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HTTP Status Codes 1xx Informational 100 Continue 101 Switching Protocols 102 Processing (WebDAV) 2xx Success 200 OK 201 Created 202 Accepted 203 Non-A 阅读全文
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Binary Search: Search a sorted array by repeatedly dividing the search interval in half. Begin with an interval covering the whole array. If the value 阅读全文
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What is the difference between POST and GET HTTP requests? GET and POST are two different types of HTTP requests. According to Wikipedia: GET requests 阅读全文
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Given an integer array nums, find the contiguous subarray (containing at least one number) which has the largest sum and return its sum. Example: Foll 阅读全文
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Given a char array representing tasks CPU need to do. It contains capital letters A to Z where different letters represent different tasks.Tasks could 阅读全文
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Given a non-empty string str and an integer k, rearrange the string such that the same characters are at least distance k from each other. All input s 阅读全文