Submission #222096

#	Time	Username	Problem	Language	Result	Execution time	Memory
222096		NONAME	Wand (COCI19_wand)	C++17	70 / 70	47 ms	5112 KiB

wand

#include <bits/stdc++.h>
#include <time.h>
//#include <random>
//#ifndef _LOCAL
//#pragma GCC optimize("-O3")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("unroll-loops")
//#endif
#define sz(x) int(x.size())
#define in(x) freopen(x, "r", stdin)
#define out(x) freopen(x, "w", stdout)
#define N 100500
#define oo ll(1e16)
#define pii pair <int, int>
#define pll pair <ll, ll>
#define ft first
#define sd second
#define pb push_back
#define ppb pop_back
#define el '\n'
#define elf endl
#define base ll(1e9 + 7)
#define re return
#define nins 4294967295
using namespace std;
typedef long long ll;
typedef long double ld;

//mt19937 rnd(0);

int n, m, rs[N];
vector <int> g[N];

void dfs(int v) {
    for (int i = 0; i < sz(g[v]); i++) {
        int to = g[v][i];

        if (rs[to])
            continue;

        rs[to] = 1;

        dfs(to);
    }
}

void solve() {
    cin >> n >> m;
    for (int i = 0; i < m; i++) {
        int v, u; cin >> v >> u; v--; u--;

        g[u].pb(v);
    }

    dfs(0);

    rs[0] |= g[0].empty();

    for (int i = 0; i < n; i++)
        cout << rs[i];
}

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    #ifdef _LOCAL
        in("input.txt");

        int t = 1;
//        cin >> t;
        for (int i = 1; i <= t; i++) {
            cout << "Test #" << i << elf;

            clock_t start_time = clock();

            solve();

            cerr.precision(4); cerr << fixed;
            cerr << elf;
            cerr << "Time :: " << ld(clock() - start_time) / CLOCKS_PER_SEC << elf;

            cout << elf;
        }
    #else
        int t = 1;
//        cin >> t;

        while (t--) {
            solve();
            cout << el;
        }
    #endif
}

• Subtask 1: 70 / 70