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https://leetcode.com/problems/permutation-sequence/ The set [1,2,3,...,n] contains a total of n! unique permutations. By listing and labeling all of t 阅读全文
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https://leetcode.com/problems/minimum-path-sum/ Given a m x n grid filled with non-negative numbers, find a path from top left to bottom right which m 阅读全文
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https://leetcode.com/problems/search-a-2d-matrix/ Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the follo 阅读全文
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https://leetcode.com/problems/jump-game/ Given an array of non-negative integers, you are initially positioned at the first index of the array. Each e 阅读全文
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https://leetcode.com/problems/n-queens-ii/ The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack 阅读全文