View Compilation Error

0_0_38371459_17497.c: In function 'main':
0_0_38371459_17497.c:37:44: error: 'false' undeclared (first use in this function)
         for (i = 0; i <= len; visit[i++] = false);
                                            ^
0_0_38371459_17497.c:37:44: note: each undeclared identifier is reported only once for each function it appears in
0_0_38371459_17497.c:51:24: error: 'true' undeclared (first use in this function)
             visit[k] = true;
                        ^
0_0_38371459_17497.c: At top level:
0_0_38371459_17497.c:76:5: error: redefinition of 'main'
 int main(void)
     ^
0_0_38371459_17497.c:5:5: note: previous definition of 'main' was here
 int main(void)
     ^
0_0_38371459_17497.c: In function 'main':
0_0_38371459_17497.c:108:44: error: 'false' undeclared (first use in this function)
         for (i = 0; i <= len; visit[i++] = false);
                                            ^
0_0_38371459_17497.c:122:24: error: 'true' undeclared (first use in this function)
             visit[k] = true;
                        ^