제출 #572909

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
572909		Theo830	Stranded Far From Home (BOI22_island)	C++17	0 / 100	139 ms	22384 KiB

island

#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 ull unsigned ll
#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
ll sum[2000005];
ll par[2000005];
ll find_par(ll x){
    if(par[x] == x){
        return x;
    }
    return par[x] = find_par(par[x]);
}
void enose(ll a,ll b){
    ll p1 = find_par(a);
    ll p2 = find_par(b);
    if(p1 != p2){
        par[p1] = p2;
        sum[p2] += sum[p1];
        sum[p1] = 0;
    }
}
int main(void){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    ll n,m;
    cin>>n>>m;
    f(i,1,n+1){
        par[i] = i;
    }
    ll s[n];
    vector<ii>exo;
    ll maxxi = 0;
    f(i,0,n){
        cin>>s[i];
        sum[i+1] = s[i];
        maxxi = max(maxxi,s[i]);
        exo.pb(ii(s[i],i+1));
    }
    vector<iii>edges;
    f(i,0,m){
        ll a,b;
        cin>>a>>b;
        if(s[a-1] > s[b-1]){
            swap(a,b);
        }
        edges.pb(iii(s[b-1],ii(a,b)));
    }
    sort(all(edges));
    sort(all(exo));
    ll pos = 0;
    ll posa[n];
    ll maxi[n+5] = {0};
    ll p[n];
    ll next[n+5];
    bool ok[n];
    for(auto x:exo){
        while(pos < m && edges[pos].F <= x.F){
            maxi[find_par(edges[pos].S.F)] = edges[pos].F;
            next[find_par(edges[pos].S.F)] = edges[pos].S.F - 1;
            enose(edges[pos].S.F,edges[pos].S.S);
            pos++;
        }
        posa[x.S - 1] = sum[find_par(x.S)];
        p[x.S - 1] = find_par(x.S);
    }
    reverse(all(exo));
    for(auto x:exo){
        if(x.F != maxxi){
            ok[x.S - 1] = ok[next[p[x.S - 1]]] * (posa[x.S - 1] >= maxi[p[x.S - 1]]);
        }
        else{
            ok[x.S - 1] = true;
        }
    }
    f(i,0,n){
        cout<<ok[i];
    }
}

컴파일 시 표준 에러 (stderr) 메시지

island.cpp: In function 'int main()':
island.cpp:90:48: warning: '*' in boolean context, suggest '&&' instead [-Wint-in-bool-context]
   90 |             ok[x.S - 1] = ok[next[p[x.S - 1]]] * (posa[x.S - 1] >= maxi[p[x.S - 1]]);
      |                           ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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