Letter Combination of phone number
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class Solution: # @return a list of strings, [s1, s2] def letterCombinations(self, digits): def dfs(num, string, res): if num == length: res.append(string) return for letter in dict[digits[num]] : dfs(num+1,string+letter,res) dict = {'2':['a','b','c'], '3':['d','e','f'], '4':['g','h','i'], '5':['j','k','l'], '6':['m','n','o'], '7':['p','q','r','s'], '8':['t','u','v'], '9':['w','x','y','z'] } res = [] length = len(digits) dfs(0, '', res) return res 0 0
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