Submission #3236725

---

Source Code Expand

# -*- coding: utf-8 -*-
from sys import stdin

s_in = lambda: stdin.readline()[:-1] # s = s_in()
d_in = lambda: int(stdin.readline()) # N = d_in()
ds_in = lambda: list(map(int, stdin.readline().split())) # List = ds_in()


N = d_in()
a_list = ds_in()

ans = 0
for i, a in enumerate(a_list):
	if i == a_list[a-1] - 1:
		ans += 1

print(ans // 2)

Submission Info

Judge Result