摘要：
There is an m x n matrix that is initialized to all 0's. There is also a 2D array indices where each indices[i] = [ri, ci] represents a 0-indexed loca 阅读全文
摘要：
1、数组a中一组数（a[i]只能是0或者1），0变成1，1变成0，怎样操作？比如，lt 832题 答：a[i]与1进行异或运算（异或运算：不同为真，相同为假） 2、判断一个数是奇数还是偶数？比如，lt 1342题 一个数的二进制从右向左的与1进行&运算，结果为0，则这个十进制数是偶数，结果为1，则这 阅读全文
摘要：
Given an n x n binary matrix image, flip the image horizontally, then invert it, and return the resulting image. To flip an image horizontally means t 阅读全文