Submission #653889

#	Time	Username	Problem	Language	Result	Execution time	Memory
653889		urosk	Stranded Far From Home (BOI22_island)	C++14	0 / 100	241 ms	20608 KiB

island

#define here cerr<<"===========================================\n"
#define dbg(x) cerr<<#x<<": "<<x<<endl;
#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
#define ld double
#define ll long long
#define llinf 100000000000000000LL // 10^17
#define pb push_back
#define popb pop_back
#define fi first
#define sc second
#define endl '\n'
#define pll pair<ll,ll>
#define pld pair<ld,ld>
#define sz(a) (ll)(a.size())
#define all(a) a.begin(),a.end()
#define ceri(a,l,r) {cerr<<#a<<": ";for(ll i_ = l;i_<=r;i_++) cerr<<a[i_]<< " ";cerr<<endl;}
#define cer(a) {cerr<<#a<<": ";for(ll x_ : a) cerr<<x_<< " ";cerr<<endl;}

#define daj_mi_malo_vremena ios_base::sync_with_stdio(false);cerr.tie(0);cout.tie(0);cin.tie(0);

using namespace std;
using namespace __gnu_pbds;
/*
ll add(ll x,ll y){
    x+=y;
    if(x<0){
        x%=mod;
        x+=mod;
    }else{
        if(x>=mod) x%=mod;
    }
    return x;
}
ll mul(ll a,ll b){
	ll ans = (a*b)%mod;
	if(ans<0) ans+=mod;
	return ans;
}
typedef tree<int,null_type,less<ll>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;
typedef tree<int,null_type,less_equal<ll>,rb_tree_tag,tree_order_statistics_node_update> ordered_multiset;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll rnd(ll l,ll r){
    return uniform_int_distribution<ll>(l,r)(rng);
}
*/
#define maxn 200005
ll n,m;
pll a[maxn];
vector<ll> g[maxn];
ll dsu[maxn],sizi[maxn],sum[maxn];
bool los[maxn];
bool vis[maxn];
ll root(ll x){
    while(x!=dsu[x]) x = dsu[x];
    return x;
}
void upd(ll x,ll y){
    x = root(x); y = root(y);
    if(x==y) return;
    if(sizi[x]>sizi[y]) swap(x,y);
    dsu[x] = y;
    sizi[y]+=sizi[x];
    sum[y]+=sum[x];
}
void tc(){
    cin >> n >> m;
    for(ll i = 1;i<=n;i++) cin >> a[i].fi;
    for(ll i = 1;i<=n;i++) a[i].sc = i;
    for(ll i = 1;i<=n;i++) sum[i] = a[i].fi;
    for(ll i = 1;i<=m;i++){
        ll x,y; cin >> x >> y;
        g[x].pb(y);
        g[y].pb(x);
    }
    iota(dsu+1,dsu+1+n,1);
    fill(sizi+1,sizi+1+n,1);
    sort(a+1,a+1+n);
    for(ll j = 1;j<=n;j++){
        ll i = a[j].sc;
        ll x = a[j].fi;
        vis[i] = 1;
        for(ll j : g[i]){
            if(!vis[j]) continue;
            j = root(j);
            if(sum[j]<x) los[j] = 1;
        }
        for(ll j : g[i]){
            if(!vis[j]) continue;
            upd(i,j);
        }
    }

    for(ll i = 1;i<=n;i++){
        ll x = i;
        bool ok = 1;
        while(x!=dsu[x]){
            if(los[x]) ok = 0;
            x = dsu[x];
        }
        if(los[x]) ok = 0;
        if(sizi[x]!=n) ok = 0;
        cout<<ok;
    }
    cout<<endl;
}
int main(){
	daj_mi_malo_vremena
    int t; t = 1;
    while(t--){
        tc();
    }
	return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 30
• Subtask 5: 0 / 35