/in/foo.cc: In function 'int main()':
/in/foo.cc:59:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j;
        ^
/in/foo.cc: In function 'void zyf(int)':
/in/foo.cc:45:10: warning: 's2' may be used uninitialized in this function [-Wmaybe-uninitialized]
    if (s1-s2<=9-minn2) 
        ~~^~~
/in/foo.cc:45:10: warning: 's1' may be used uninitialized in this function [-Wmaybe-uninitialized]