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Given a string s and a string t, check if s is subsequence of t. You may assume that there is only lower case English letters in both s and t. t is po 阅读全文
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In LeetCode Store, there are some kinds of items to sell. Each item has a price. However, there are some special offers, and a special offer consists 阅读全文
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Initially on a notepad only one character 'A' is present. You can perform two operations on this notepad for each step: Copy All : You can copy all th 阅读全文
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Given an array of scores that are non negative integers. Player 1 picks one of the numbers from either end of the array followed by the player 2 and t 阅读全文
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Given a non negative integer n, count all numbers with unique digits, x, where 0 ≤ x Given n = 2, return 91. (The answer should be the total numbers i 阅读全文
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Given a positive integer n, break it into the sum of at least two positive integers and maximize the product of those integers. Return the maximum pro 阅读全文
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You are given n pairs of numbers. In every pair, the first number is always smaller than the second number. Now, we define a pair (c, d) can follow an 阅读全文
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Given two strings s1, s2, find the lowest ASCII sum of deleted characters to make two strings equal. Example 1: Input: s1 = "sea", s2 = "eat" Output: 阅读全文
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A sequence of number is called arithmetic if it consists of at least three elements and if the difference between any two consecutive elements is the 阅读全文
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Given a string, your task is to count how many palindromic substrings in this string. The substrings with different start indexes or end indexes are c 阅读全文