제출 #123217

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
123217		cvele	Wand (COCI19_wand)	C++14	70 / 70	124 ms	4852 KiB

wand

#include <iostream>
#include <sstream>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <cctype>
#include <cstring>
#include <climits>
#include <iomanip>
#include <bitset>
#include <algorithm>
#include <vector>
#include <stack>
#include <queue>
#include <deque>
#include <set>
#include <list>
#include <map>

using namespace std;

const int N = 100005;

int n, m;
bool used[N];
bool ok[N];
vector <int> adj[N];

void dfs(int u, int cnt) {
  if (cnt > 0) ok[u] = 1;
  used[u] = 1;
  for (int v : adj[u]) {
    if (!used[v] || v == 1) {
      dfs(v, min(2, cnt + 1));
    }
  }
}

int main() {
  cin >> n >> m;
  for (int i = 0; i < m; i++) {
    int x, y;
    cin >> x >> y;
    adj[y].push_back(x);
  }
  dfs(1, 0);
  if (adj[1].empty()) ok[1] = 1;
  for (int i = 1; i <= n; i++) {
    cout << ok[i];
  }
  cout << endl;
  return 0;
}

• Subtask 1: 70 / 70