foo.cc:7:19: error: stray '#' in program
 double MIN = 2333;#include <cstdio>
                   ^
foo.cc:7:20: error: 'include' does not name a type
 double MIN = 2333;#include <cstdio>
                    ^~~~~~~
foo.cc:12:12: error: redefinition of 'int a [33333]'
 int a[33333], n, fx, fy;
            ^
foo.cc:5:5: note: 'int a [33333]' previously declared here
 int a[33333], n, fx, fy;
     ^
foo.cc:12:15: error: redefinition of 'int n'
 int a[33333], n, fx, fy;
               ^
foo.cc:5:15: note: 'int n' previously declared here
 int a[33333], n, fx, fy;
               ^
foo.cc:12:18: error: redefinition of 'int fx'
 int a[33333], n, fx, fy;
                  ^~
foo.cc:5:18: note: 'int fx' previously declared here
 int a[33333], n, fx, fy;
                  ^~
foo.cc:12:22: error: redefinition of 'int fy'
 int a[33333], n, fx, fy;
                      ^~
foo.cc:5:22: note: 'int fy' previously declared here
 int a[33333], n, fx, fy;
                      ^~
foo.cc:13:14: error: redefinition of 'const double perfert'
 const double perfert = 0.6180339887498949;  
              ^~~~~~~
foo.cc:6:14: note: 'const double perfert' previously defined here
 const double perfert = 0.6180339887498949;  
              ^~~~~~~
foo.cc:14:8: error: redefinition of 'double MIN'
 double MIN = 2333;
        ^~~
foo.cc:7:8: note: 'double MIN' previously defined here
 double MIN = 2333;#include <cstdio>
        ^~~
foo.cc: In function 'int IF(double)':
foo.cc:49:5: error: redefinition of 'int IF(double)'
 int IF(double flag) {
     ^~
foo.cc:16:5: note: 'int IF(double)' previously defined here
 int IF(double flag) {
     ^~
foo.cc: In function 'int main()':
foo.cc:60:5: error: redefinition of 'int main()'
 int main() {
     ^~~~
foo.cc:27:5: note: 'int main()' previously defined here
 int main() {
     ^~~~

自豪的采用 HydroJudge 进行评测(github.com/hydro-dev/HydroJudge)