Submission #603888

#	Time	Username	Problem	Language	Result	Execution time	Memory
603888		Theo830	Newspapers (CEOI21_newspapers)	C++17	9 / 100	40 ms	50508 KiB

newspapers

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll INF = 1e9+7;
const ll MOD = 998244353;
typedef pair<ll,ll> ii;
#define iii pair<ll,ii>
#define f(i,a,b) for(ll i = a;i < b;i++)
#define pb push_back
#define vll vector<ll>
#define F first
#define S second
#define all(x) (x).begin(), (x).end()
///I hope I will get uprating and don't make mistakes
///I will never stop programming
///sqrt(-1) Love C++
///Please don't hack me
///@TheofanisOrfanou Theo830
///Think different approaches (bs,dp,greedy,graphs,shortest paths,mst)
///Stay Calm
///Look for special cases
///Beware of overflow and array bounds
///Think the problem backwards
///Training
bool ok[1<<20] = {0};
vll res[1<<20];
bool v[1<<20] = {0};
vector<vll>adj;
bool solve(ll mask){
    if(ok[mask]){
        return 1;
    }
    if(v[mask]){
        return 0;
    }
    v[mask] = 1;
    ll siz = 500;
    f(j,0,20){
        if(mask & (1LL<<j)){
            ll num = mask ^ (1LL<<j);
            ll neo = 0;
            f(i,0,20){
                if(num & (1LL<<i)){
                    for(auto x:adj[i]){
                        neo |= (1<<x);
                    }
                }
            }
            ok[mask] |= solve(neo);
            if(solve(neo)){
                if(res[neo].size() + 1 < siz){
                    siz = res[neo].size() + 1;
                    res[mask] = res[neo];
                    res[mask].insert(res[mask].begin(),j+1);
                }
            }
        }
    }
    return ok[mask];
}
int main(void){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    ll n,m;
    cin>>n>>m;
    adj.assign(n+5,vll());
    f(i,0,m){
        ll a,b;
        cin>>a>>b;
        a--;
        b--;
        adj[a].pb(b);
        adj[b].pb(a);
    }
    ok[0] = 1;
    ll num = (1<<n) - 1;
    if(solve(num)){
        cout<<"YES\n";
        cout<<res[num].size()<<"\n";
        for(auto x:res[num]){
            cout<<x<<" ";
        }
    }
    else{
        cout<<"NO\n";
    }
}

Compilation message (stderr)

newspapers.cpp: In function 'bool solve(ll)':
newspapers.cpp:51:40: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   51 |                 if(res[neo].size() + 1 < siz){
      |                    ~~~~~~~~~~~~~~~~~~~~^~~~~

• Subtask 1: 9 / 12
• Subtask 2: 0 / 8
• Subtask 3: 0 / 80