/in/foo.cc: In function 'int main()':
/in/foo.cc:4:10: warning: unused variable 'i' [-Wunused-variable]
  int n,m,i,k,j,f[102][102];
          ^
/in/foo.cc:4:14: warning: unused variable 'j' [-Wunused-variable]
  int n,m,i,k,j,f[102][102];
              ^
/in/foo.cc:7:6: warning: unused variable 't' [-Wunused-variable]
  int t;
      ^