View Compilation Error

0_0_31276126_18713.cpp: In function 'int main()':
0_0_31276126_18713.cpp:38:13: error: redeclaration of 'long long int ans'
   long long ans=max(dp[len][0],dp[len][1]);
             ^
0_0_31276126_18713.cpp:25:13: note: 'long long int ans' previously declared here
   long long ans = 0;
             ^