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Given two words word1 and word2, find the minimum number of operations required to convert word1 to word2. You have the following 3 operations permitt 阅读全文
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https://leetcode.com/problems/sort-array-by-parity/ Given an array A of non-negative integers, return an array consisting of all the even elements of 阅读全文
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https://leetcode.com/problems/find-all-numbers-disappeared-in-an-array/ Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elemen 阅读全文
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https://leetcode.com/problems/valid-number/ Validate if a given string can be interpreted as a decimal number. Some examples:"0" => true" 0.1 " => tru 阅读全文
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https://leetcode.com/problems/sudoku-solver/ Write a program to solve a Sudoku puzzle by filling the empty cells. A sudoku solution must satisfy all o 阅读全文
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https://leetcode.com/problems/reverse-nodes-in-k-group/ Given a linked list, reverse the nodes of a linked list k at a time and return its modified li 阅读全文
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http://poj.org/problem?id=3264 Description For the daily milking, Farmer John's N cows (1 ≤ N ≤ 50,000) always line up in the same order. One day Farm 阅读全文
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http://acm.hdu.edu.cn/showproblem.php?pid=3974 Problem Description There is a company that has N employees(numbered from 1 to N),every employee in the 阅读全文
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http://codeforces.com/contest/1136 A #include <bits/stdc++.h> using namespace std; const int maxn = 1e5 + 10; int N, K; struct Node { int L; int R; }n 阅读全文
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https://leetcode.com/problems/longest-valid-parentheses/ Given a string containing just the characters '(' and ')', find the length of the longest val 阅读全文