View Compilation Error

0_0_36085310_28274.c:12:12: error: unknown type name 'lll'
 void setin(lll* head,int i, int x, int y)
            ^
0_0_36085310_28274.c:32:12: error: unknown type name 'lll'
 int setout(lll* head, int x)
            ^
0_0_36085310_28274.c: In function 'main':
0_0_36085310_28274.c:48:5: error: unknown type name 'lll'
     lll head{};
     ^
0_0_36085310_28274.c:48:13: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
     lll head{};
             ^
0_0_36085310_28274.c:50:9: error: 'head' undeclared (first use in this function)
         head.a[i] = nullptr;
         ^
0_0_36085310_28274.c:50:9: note: each undeclared identifier is reported only once for each function it appears in
0_0_36085310_28274.c:50:21: error: 'nullptr' undeclared (first use in this function)
         head.a[i] = nullptr;
                     ^