foo.c: In function ‘main’:
foo.c:28:21: warning: variable ‘c’ set but not used [-Wunused-but-set-variable]
   28 |     int min[n],xiao,c;
      |                     ^
foo.c:14:19: warning: variable ‘b’ set but not used [-Wunused-but-set-variable]
   14 |     int max[m],da,b;
      |                   ^