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On a staircase, the i-th step has some non-negative cost cost[i] assigned (0 indexed). Once you pay the cost, you can either climb one or two steps. Y 阅读全文
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A self-dividing number is a number that is divisible by every digit it contains. For example, 128 is a self-dividing number because 128 % 1 == 0, 128 阅读全文
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Given an array of integers nums, write a method that returns the "pivot" index of this array. We define the pivot index as the index where the sum of 阅读全文
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Given two integer arrays A and B, return the maximum length of an subarray that appears in both arrays. Example 1: Note: 思路: 动态规划,dp[i][j]代表长度为i的a与长度为 阅读全文
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We have two special characters. The first character can be represented by one bit 0. The second character can be represented by two bits (10 or 11). N 阅读全文
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Given a sorted array consisting of only integers where every element appears twice except for one element which appears once. Find this single element 阅读全文