Submission #993642

#	Time	Username	Problem	Language	Result	Execution time	Memory
993642		amine_aroua	Stranded Far From Home (BOI22_island)	C++17	10 / 100	1084 ms	19024 KiB

island

#include<bits/stdc++.h>
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
using namespace std;
#define int long long
#define pb push_back
#define fore(i , n) for(int i = 0 ; i<n;i++)
#define forr(i , x , y) for(int i = x ; i <= y; i++)
#define forn(i , x , y) for(int i = x ; i >= y; i--)
const int N = 2e5 + 10;
vector<int> adj[N];
int a[N];
int n , m;
vector<int> ans(N , -1);
void expand(int x)
{
    for(auto u : adj[x])
    {
        if(a[u] <= a[x] && ans[u] == 1)
        {
            ans[x] = 1;
            return ;
        }
    }
    priority_queue<pair<int ,int> , vector<pair<int ,int>>  , greater<pair<int , int>>> pq;
    int cur = a[x];
    vector<bool> vis(n , 0);
    pq.push({cur , x});
    vector<int> possible;
    while(!pq.empty())
    {
        auto [val , node] = pq.top();
        pq.pop();
        if(val >= cur)
        {
            possible.pb(node);
        }
        if(val > cur)
            continue;
        if(vis[node])
            continue;
        vis[node] = 1;
        if(node != x)
            cur+=val;
        for(auto u : adj[node])
        {
            pq.push({a[u] , u});
        }
    }
    bool acc = 1;
    fore(i , n)
    {
        if(!vis[i])
        {
            acc = 0;
            break;
        }
    }
    if(acc)
    {
        for(auto u : possible)
            ans[u] = 1;
        ans[x] = 1;
    }
    else
    {
        fore(i , n)
        {
            if(vis[i])
                ans[i] = 0;
        }
        ans[x] = 0;
    }
}
signed main()
{
    cin>>n>>m;
    vector<pair<int ,int>> ve;
    fore(i , n)
    {
        cin>>a[i];
        ve.pb({a[i] , i});
    }
    sort(ve.begin() , ve.end());
    fore(i , m)
    {
        int u , v;
        cin>>u>>v;
        u-- , v--;
        adj[u].pb(v);
        adj[v].pb(u);
    }
    for(auto [val , i] : ve)
    {
        if(ans[i] == -1)
            expand(i);
    }
    fore(i , n)
        cout<<ans[i];
}

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