Submission #869445

#	Time	Username	Problem	Language	Result	Execution time	Memory
869445		lolismek	Stranded Far From Home (BOI22_island)	C++14	0 / 100	2 ms	6748 KiB

island

#include <algorithm>
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>

#define pii pair <int, int>


using namespace std;

//ifstream fin("input.in");
//ofstream fout("output.out");

#define fin cin
#define fout cout

const int NMAX = 2e5;

int v[NMAX + 1];
vector <int> adj[NMAX + 1];

int par[NMAX + 1];
int sum[NMAX + 1];

int Find(int x){
    if(x == par[x]){
        return x;
    }
    return par[x] = Find(par[x]);
}

void Join(int x, int y){
    x = par[x];
    y = par[y];

    par[x] = y;
    sum[y] += sum[x];
}

bool ins[NMAX + 1];

void Insert(int x){
    ins[x] = true;
    for(int vec : adj[x]){
        if(ins[vec]){
            Join(vec, x);
        }
    }
}

bool ans[NMAX + 1];

int main(){

    int n, m;
    fin >> n >> m;

    vector <pii> aux;
    priority_queue <pii, vector <pii>, greater <pii>> pq;

    for(int i = 1; i <= n; i++){
        fin >> v[i];
        par[i] = i;
        sum[i] = v[i];
        aux.push_back({v[i], i});
        pq.push({v[i], i});
        ans[i] = 1;
    }

    for(int i = 1; i <= m; i++){
        int a, b;
        fin >> a >> b;
        adj[a].push_back(b);
        adj[b].push_back(a);
    }

    //cout << v[1] << ' ' << v[1010] << ' ' << v[1999] << ' ' << v[2000] << endl;

    sort(aux.begin(), aux.end());

    for(int i = 0; i < (int)aux.size(); i++){
        //cout << i << endl;
        int val = aux[i].first;
        Insert(aux[i].second);
        //cout << "-- " << aux[i].second << endl;
        while(i + 1 < (int)aux.size() && aux[i + 1].first == aux[i].first){
            Insert(aux[++i].second);
            //cout << "-- " << aux[i].second << endl;
        }

        if(i == 1999){
            //cout << ") " << (int)pq.size() << endl;
        }

        vector <pii> toinsert;
        while(!pq.empty() && ((i == (int)aux.size() - 1 && pq.top().first >= val) || (i < (int)aux.size() - 1 && pq.top().first >= val && pq.top().first < aux[i + 1].first))){
            int node = pq.top().second;
            int x = pq.top().first;
            pq.pop();



            int s = sum[Find(node)];


            if(i == 1999){
               // cout << ")) " << node << endl;
            }
            if(s == x){
               // cout << ">> " << node << ' ' << val << ' ' << x << ' ' << s << endl;
                ans[node] = 0;
            }else{
                toinsert.push_back({s, node});
            }
        }

        for(pii x : toinsert){
            if(i == (int)aux.size() - 1){
                continue;
            }
            if(x.first >= aux[i + 1].first){
                pq.push(x);
            }else{
                ans[x.second] = 0;
            }
        }
    }

    for(int i = 1; i <= n; i++){
        fout << ans[i];
    }
    fout << '\n';

    return 0;
}

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