/in/foo.cc: In function 'int dp(int, int)':
/in/foo.cc:35:30: error: 'sum' was not declared in this scope
         if(dp(x,k)+dp(k+1,y)+sum[x][y]<=minv) {
                              ^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:72:8: error: 'DP' was not declared in this scope
     DP();
        ^