/in/foo.cc: In function 'void init()':
/in/foo.cc:21:6: warning: unused variable 't' [-Wunused-variable]
  int t=0,now=0; 
      ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:49:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j;
        ^