leileicaocao的专栏

Implement an algorithm to determine if a string has all unique characters. What if you cannot use additional data structures? /* Implement an algorithm to determine if a string has all unique charac

Given an image represented by an NxN matrix, where each pixel in the image is 4 bytes, write a method to rotate the image by 90 degrees. Can you do this in place? /* Given an image represented by an

Write an algorithm such that if an element in an MxN matrix is 0, its entire row and column are set to 0. /* Write an algorithm such that if an element in an MxN matrix is 0, its entire row and co

Write a method to replace all spaces in a string with '%20'.  You may assume that the string has sufficient space at the  end of the string to hold the additional characters, and  that you are give