foo.c: In function 'solve':
foo.c:5:24: warning: 'return' with a value, in function returning void [-Wreturn-type]
    5 |                 return 0;
      |                        ^
foo.c:2:6: note: declared here
    2 | void solve(long long int x)
      |      ^~~~~
foo.c:7:18: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
    7 |         printf("%d", x%2);
      |                 ~^   ~~~
      |                  |    |
      |                  int  long long int
      |                 %lld
foo.c: In function 'main':
foo.c:11:25: warning: unused variable 'j' [-Wunused-variable]
   11 |         long long int x,j;
      |                         ^

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