#include<iostream> #include<vector> #include<string> using namespace std; int numOfDecoding(string s,int len) { if(!len || s[0]=='0') return 0; vector<int> nums(len,0); nums[0]=1; if(s[1]=='0'&& s[0]<='2') nums[1]=1; else if(s[0]=='1' ||(s[0]=='2'&&...