江南第一少

摘要： Given isSubstring() which checks if one word is a substring of another, write code to check if s2 is a rotation of s1. class Solution { public bool... 阅读全文

摘要： class Solution { public String compress(String str) { int size = countCompression(str); //先check compress之后的size，若更大，返回原string。 if(size >= str.leng... 阅读全文

摘要： Design a stack that supports push, pop, top, and retrieving the minimum element in constant time.push(x) -- Push element x onto stack.pop() -- Removes... 阅读全文