/in/foo.c:2:1: error: unknown type name 'bool'; did you mean '_Bool'?
 bool flag;
 ^~~~
 _Bool
/in/foo.c:4:1: error: unknown type name 'bool'; did you mean '_Bool'?
 bool sg[1005];
 ^~~~
 _Bool
/in/foo.c:22:17: error: unknown type name 'bool'; did you mean '_Bool'?
 void outt(int u,bool check){
                 ^~~~
                 _Bool
/in/foo.c: In function 'main':
/in/foo.c:45:2: warning: implicit declaration of function 'outt'; did you mean 'puts'? [-Wimplicit-function-declaration]
  outt(1,flag);
  ^~~~
  puts