/in/foo.cc:3:0: warning: ignoring #pragma comment  [-Wunknown-pragmas]
 #pragma comment(linker, "/STACK:1024000000,1024000000")
 
/in/foo.cc: In function 'long long int max(long long int, long long int)':
/in/foo.cc:30:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  if (a>b) return a;return b;
  ^~
/in/foo.cc:30:20: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
  if (a>b) return a;return b;
                    ^~~~~~
/in/foo.cc: In function 'void change(long long int, long long int, long long int)':
/in/foo.cc:177:12: warning: unused variable 'ans' [-Wunused-variable]
  long long ans=0;
            ^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:263:14: warning: unused variable 'm' [-Wunused-variable]
  long long i,m,x,y,k,q,z;
              ^