/in/foo.cc:1:4: error: stray '#' in program
  1 #include<iostream>
    ^
/in/foo.cc:2:4: error: stray '#' in program
  2 #include<cstring>
    ^
/in/foo.cc:3:4: error: stray '#' in program
  3 #include<cstdio>
    ^
/in/foo.cc:4:4: error: stray '#' in program
  4 #include<cmath>
    ^
/in/foo.cc:1:2: error: expected unqualified-id before numeric constant
  1 #include<iostream>
  ^
/in/foo.cc:6:2: error: expected unqualified-id before numeric constant
  6 const int maxn=2505;
  ^
/in/foo.cc:7:2: error: expected unqualified-id before numeric constant
  7 int n,m,f[maxn],s[maxn],a;
  ^
/in/foo.cc:8:2: error: expected unqualified-id before numeric constant
  8 int main(){
  ^