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  1. #include <iostream>
  2. #include <stdio.h>
  3.  
  4. using namespace std;
  5.  
  6. int main() {
  7. 	int n;
  8. 	scanf("%d\n",&n);
  9.  
  10. 	int *a;
  11. 	a = (int *)malloc(n * sizeof(int));
  12. 	for(int i=0; i<n; i++) scanf("%d\n",&a[i]);
  13.  
  14. 	int cnt = 0;
  15. 	int cur = 1;
  16. 	while (true){
  17. 		if (cur == 2) {
  18. 			printf("%d\n",cnt);
  19. 			break;
  20. 		}
  21. 		else if (cnt >= n){
  22. 			printf("-1\n");
  23. 			break;
  24. 		}
  25. 		else {
  26. 			cur = a[cur-1];
  27. 			++cnt;
  28. 		}
  29. 	}
  30.  
  31. 	return 0;
  32. }
Success #stdin #stdout 0s 15240KB
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stdin
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stdout
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3
https://ideone.com/2lp2Fm
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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