Submission #9236

#	Time	Username	Problem	Language	Result	Execution time	Memory
9236		silas	Your life (kriii2_Y)	C++98	4 / 4	212 ms	7580 KiB

Y

#include <iostream>
#include <string.h>
#include <queue>
#include <vector>
#include <utility>
#define Nsize 100001
using namespace std;

int N, M; // N : 노드의 갯수, 선 갯수
vector<int> arr[Nsize];
int dist[Nsize];

int BFS(int cur) {
	queue<pair<int,int> > que;
	que.push(make_pair(1,0));
	while (!que.empty()) {
		int out = que.front().first;
		int out_dist = que.front().second + 1;
		que.pop();
		for (int i = 0 ; i < arr[out].size(); i++) {
			if (arr[out][i] == N) {
				return out_dist;
			}
			if (dist[arr[out][i]] == -1) {
				dist[arr[out][i]] = out_dist;
				que.push(make_pair(arr[out][i], out_dist));
			}
		}
	}
	return -1;
}

int main() {
	memset(dist, -1, sizeof(dist));
	cin >> N >> M;
	int temp1, temp2;
	for (int i = 0 ; i < M; i++) {
		cin >> temp1 >> temp2;
		arr[temp1].push_back(temp2);
	}
	cout << BFS(1) << endl;
	return 0;
}

• Subtask 1: 1 / 1
• Subtask 2: 3 / 3