Create Total_Decoding_Messages

Day24/Total_Decoding_Messages

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+//{ Driver Code Starts
+#include<bits/stdc++.h>
+using namespace std;
+
+// } Driver Code Ends
+
+
+
+class Solution { 
+ public: 
+ const int N=1000000007; 
+ int countWaysUtil(string s, int i, vector<int>&dp) 
+ { 
+     if(i<=0)return 1; 
+     if(dp[i]!=-1)return dp[i]; 
+     int ways=0; 
+     if(s[i]>='1') 
+     { 
+         ways=countWaysUtil(s,i-1,dp); 
+     } 
+     if(s[i-1]=='1' or (s[i-1]=='2' and s[i]<'7')) 
+     { 
+         ways+=countWaysUtil(s,i-2,dp); 
+     } 
+     return dp[i]=ways%N; 
+ } 
+  int CountWays(string str){ 
+      // Code here 
+      int n=str.size(); 
+      vector<int>dp(n,-1); 
+
+      return countWaysUtil(str,n-1,dp)%N; 
+  } 
+
+};
+
+
+//{ Driver Code Starts.
+int main(){
+	int tc;
+	cin >> tc;
+	while(tc--){
+		string str;
+		cin >> str;
+		Solution obj;
+		int ans = obj.CountWays(str);
+		cout << ans << "\n";
+	}
+	return 0;
+}
+// } Driver Code Ends