James Pan

原题网址：https://leetcode.com/problems/additive-number/Additive number is a string whose digits can form additive sequence.A valid additive sequence should contain at least three numbers. Except

原题网址：https://leetcode.com/problems/sudoku-solver/Write a program to solve a Sudoku puzzle by filling the empty cells.Empty cells are indicated by the character '.'.You may assume that th

原题网址：https://leetcode.com/problems/scramble-string/Given a string s1, we may represent it as a binary tree by partitioning it to two non-empty substrings recursively.Below is one possible