/in/foo.cc: In function 'int main()':
/in/foo.cc:17:18: error: 'dp' was not declared in this scope
     if(len == 1){dp[i][g] = 1;continue;}
                  ^~
/in/foo.cc:19:6: error: 'dp' was not declared in this scope
      dp[i][g] = max(dp[i][g], dp[i][k] + dp[k][i] + pow(2,g-i-1));
      ^~
/in/foo.cc:23:12: error: 'i' was not declared in this scope
   ans += a[i];
            ^