foo.c: In function ‘main’:
foo.c:6:31: warning: unused variable ‘c’ [-Wunused-variable]
    6 |         int list[N],n,a=1,b=0,c;
      |                               ^
foo.c:6:27: warning: unused variable ‘b’ [-Wunused-variable]
    6 |         int list[N],n,a=1,b=0,c;
      |                           ^
foo.c:6:23: warning: unused variable ‘a’ [-Wunused-variable]
    6 |         int list[N],n,a=1,b=0,c;
      |                       ^