题解 | #把数字翻译成字符串#

public class Solution {
    /**
     * 解码
     * @param nums string字符串 数字串
     * @return int整型
     */
   public int solve (String nums) {
        if(nums.length() == 0 || nums.charAt(0) == '0')
            return 0;
        int[] dp = new int[nums.length()];
        dp[0] = 1;
        for(int i = 1; i < dp.length; i++){
            if(nums.charAt(i) != '0'){
                dp[i] = dp[i-1];
            }
            //  3 2 4 
            int num = (nums.charAt(i-1)-'0')*10 + (nums.charAt(i)-'0');
            if(num >= 10 && num <= 26){
                if(i == 1){
                    dp[i] += 1;
                }else{
                    dp[i] += dp[i-2];
                }
            }
        }
        return dp[nums.length()-1];

    }



}