제출 #1009239

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1009239		lrancic	Special graph (IZhO13_specialg)	C++17	0 / 100	1014 ms	5648 KiB

specialg

#include <iostream>
#include <vector>
#include <unordered_set>

int path(std::vector<int> &vec) {
	int x, y, c = 0; std::cin >> x >> y;
	std::unordered_set<int> visited;

	while (x != y) {
		x = vec[x];

		if (visited.find(x) != visited.end() || x == -1) return -1;
		visited.insert(x);

		c++;
	}

	return c;
}

int main() {
	std::ios_base::sync_with_stdio(false), std::cin.tie(nullptr), std::cout.tie(nullptr);

	int n; std::cin >> n;
	std::vector<int> vec(n+1); for (int i = 1; i <= n; i++) std::cin >> vec[i];

	int m; std::cin >> m;
	for (int i = 0; i < m; i++) {
		int act; std::cin >> act;

		if (act == 1) {
			int x; std::cin >> x;
			vec[x] = -1;
			continue;
		}

		std::cout << path(vec) << '\n';
	}
}

• Subtask 1: 0 / 100