foo.c: In function 'jzzh':
foo.c:14:14: warning: unused variable 'j' [-Wunused-variable]
  int i=0,k,t,j;
              ^
foo.c:14:12: warning: unused variable 't' [-Wunused-variable]
  int i=0,k,t,j;
            ^
foo.c: In function 'main':
foo.c:7:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&m,&n);
  ^~~~~~~~~~~~~~~~~~~
foo.c: In function 'jzzh':
foo.c:25:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

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