Letter Combinations of a Phone Number Given a digit string, return all possible letter combinations that the number could represent. A mapping ...
经典的backtracking 回溯算法 的题目。当一个题目,存在各种满足条件的组合,并且需要把它们全部列出来时,就可以考虑backtracking了。当然,backtracking在一定程度上属于穷举,所以当数据特别大的时候,不合适。而对于那些题目,可能就需要通过动态规划来完成。 这道题的思路很简单,假设输入的是 , 对应的是 abc , 对应的是 edf ,那么我们在递归时,先确定 对应的其 ...
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Letter Combinations of a Phone Number Given a digit string, return all possible letter combinations that the number could represent. A mapping ...
Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like ...
题目链接 Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like ...
原题地址:https://oj.leetcode.com/problems/letter-combinations-of-a-phone-number/ 题意: Given a digit string, return all possible letter combinations ...
题目: Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like ...
题目描述 给定一个仅包含数字 2-9 的字符串,返回所有它能表示的字母组合。 给出数字到字母的映射如下(与电话按键相同)。注意 1 不对应任何字母。 示例: ...
Given a string containing digits from 2-9inclusive, return all possible letter combinations that the number could represent. A mapping of digit ...
题目链接 Given two integers n and k, return all possible combinations of k numbers out of 1 ... n. For example, If n = 4 and k = 2, a solution ...