/in/foo.cc: In function 'int main()':
/in/foo.cc:32:18: error: 'scanf' was not declared in this scope
     scanf("%d",&a);
                  ^
/in/foo.cc:46:47: error: 'printf' was not declared in this scope
     printf("%d\n",min(dp[root][1],dp[root][0]));
                                               ^