Submission #1311191

#	Time	Username	Problem	Language	Result	Execution time	Memory
1311191		_Temirhan	Povjerenstvo (COI22_povjerenstvo)	C++20	0 / 100	30 ms	12896 KiB

Main

#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>  
#include <ext/pb_ds/assoc_container.hpp>

using namespace std;
using namespace __gnu_pbds;

#if defined(__GNUC__) || defined(__clang__)
#pragma GCC optimize("Ofast,unroll-loops,inline-functions,no-stack-protector,03")
#pragma GCC target ("sse,sse2,sse3,ssse3,sse4,popcnt,abm,avx2,mmx,fma,avx,tune=native")
#pragma clang loop vectorize(enable)
#pragma clang loop interleave(enable)
#endif

#define int long long
#define sz(x) (int)x.size()
#define F first
#define S second
#define pb push_back
#define nl '\n'
#define o_set tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update>
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
typedef pair<int, int> pii;

void file( string s = "" )
{
    if( s.empty() )
        return;
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

const int N = 2e5 + 2;
const int N1 = 1e6 + 2;
const int inf = 1e9 + 2;
const int INF = 1e18 + 2;
const int mod = 1e9 + 7;
int T = 1, n, m, us[N], dg[N];
vector< int > g[N], ans;

void dfs( int v, int cnt )
{
    us[v] = cnt;
    int ch = (cnt == 1);
    for( int to: g[v] )
    {
        if( us[to] == cnt )
            ch = 0;
        if( !us[to] )
            dfs(to, 3 - cnt);
    }
    if( ch )
        ans.pb(v);
}

void solve()
{
    cin >>n >>m;
    for( int i = 1, u, v; i <= m; ++i )
    {
        cin >>u >>v;
        g[v].pb(u);
        ++dg[u];
    }
    vector< pii > lv(n + 1);
    for( int i = 1; i <= n; ++i )
        lv[i] = {dg[i], i};
    sort(lv.begin() + 1, lv.end());
    for( int i = 1; i <= n; ++i )
        if( !us[lv[i].S] )
            dfs(lv[i].S, 1);
    cout <<sz(ans) <<nl;
    for( int u: ans )
        cout <<u <<' ';
}

signed main()
{
    file("");
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    // cin >>T;
    while( T-- )
        solve();
}

Compilation message (stderr)

Main.cpp: In function 'void file(std::string)':
Main.cpp:29:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:30:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 13
• Subtask 2: 0 / 21
• Subtask 3: 0 / 33
• Subtask 4: 0 / 33