/in/foo.cc: In function 'int main()':
/in/foo.cc:38:10: warning: unused variable 'x' [-Wunused-variable]
  int m,n,x,f[100]={0},s[50][2];
          ^
/in/foo.cc:65:6: warning: unused variable 'temx' [-Wunused-variable]
  int temx=s[0][0],temy=s[0][1];
      ^~~~
/in/foo.cc:65:19: warning: unused variable 'temy' [-Wunused-variable]
  int temx=s[0][0],temy=s[0][1];
                   ^~~~