The card number, a thirteen - or sixteen-digit string with a check digit.
信用卡号，13或16位数字组成的字符串，包括一个校验位。
Given a digit string, return all possible letter combinations that the number could represent.
给定一个数字字符串，返回所有这些数字可以表示的字母组合。
Given a digit string, return all possible letter combinations that the number could represent.
题目如下，输入一串数字，根据电话键盘布局输出此数字可能代表的字母组合。
According to the principle of pattern recognition, a digit string is presegmented into single digits, then each of the digits is recognized by using an associated method.
它首先应用模式识别原理将待识别数字串分割为单个数字，再用一种联合式方法识别每个数字。
According to the principle of pattern recognition, a digit string is presegmented into single digits, then each of the digits is recognized by using an associated method.
它首先应用模式识别原理将待识别数字串分割为单个数字，再用一种联合式方法识别每个数字。
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