cpp

DP/Total Decoding Messages.cpp

@@ -0,0 +1,35 @@
+#include<iostream>
+#include<bits/stdc++.h>
+using namespace std;
+int main()
+ {
+	//code
+	int t;
+	cin>>t;
+	while(t--){
+	    int n;
+	    cin>>n;
+	    string s;
+	    cin>>s;
+	    if(s[0]=='0'){
+	        cout<<0<<endl;
+	        continue;
+	    }
+
+	    int dp[n+1];
+	    dp[0]=dp[1]=1;
+
+	    for(int i=2;i<=n;i++){
+	        dp[i]=0;
+
+	        if(s[i-1]>'0'){
+	            dp[i]=dp[i-1];
+	        }
+	        if( (s[i-2]=='1') || ( s[i-2]=='2' && s[i-1]<'7') ){
+	            dp[i]=dp[i]+dp[i-2];
+	        }
+	    }
+	    cout<<dp[n]<<endl;
+	}
+	return 0;
+}