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数独生成算法
1.先生成一个种子列表代码:swift2.行变换之后,替换左右两边3.列变换之后替换上下两边4.左右两边分别列变换替换四个角的3*3空格代码:swift
leetcode 695. Max Area of Island
Given a non-empty 2D array grid of 0's and 1's, an island is a group of 1's (representing land) connected 4-directionally (horizontal or ve…
leetcode 130. Surrounded Regions
Given a 2D board containing 'X' and 'O' (the letter O), capture all regions surrounded by 'X'. A region is captured by flipping all 'O's in…
leetcode 200. Number of Islands
Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by connect…
lc463. Island Perimeter
You are given a map in form of a two-dimensional integer grid where 1 represents land and 0 represents water. Grid cells are connected hori…
lc1502. Can Make Arithmetic Progression From Sequence
Given an array of numbers arr. A sequence of numbers is called an arithmetic progression if the difference between any two consecutive elem…
lc238. Product of Array Except Self
Given an array nums of n integers where n > 1, return an array output such that output[i] is equal to the product of all the elements of nu…
lc152. Maximum Product Subarray
Given an integer array nums, find the contiguous subarray within an array (containing at least one number) which has the largest product. E…
lc1389. Create Target Array in the Given Order
Given two arrays of integers nums and index. Your task is to create target array under the following rules: Initially target array is empty…
lc119. Pascal's Triangle II
Given a non-negative index k where k ≤ 33, return the kth index row of the Pascal's triangle. Note that the row index starts from 0. In Pas…
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