Submission #993675

#	Time	Username	Problem	Language	Result	Execution time	Memory
993675		amine_aroua	Stranded Far From Home (BOI22_island)	C++17	35 / 100	1048 ms	31728 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<bool> vis(N , 0);
vector<int> ans(N , -1);
priority_queue<pair<int ,int> , vector<pair<int ,int>>  , greater<pair<int , int>>> pq;
vector<int> possible;
vector<int> nodes;
void expand(int x)
{
    pq = priority_queue<pair<int ,int> , vector<pair<int ,int>>  , greater<pair<int , int>>>();
    int cur = a[x];
    pq.push({cur , x});
    possible.clear();
    nodes.clear();

    while(!pq.empty())
    {
        auto [val , node] = pq.top();
        pq.pop();
        if(val == cur)
        {
            possible.pb(node);
            if(ans[node] == 0)
            {
                for(auto v : nodes)
                    vis[v] = 0;
                ans[x] = 0;
                return ;
            }
        }
        if(val > cur)
            break;
        if(vis[node])
            continue;
        vis[node] = 1;
        nodes.pb(node);
        if(node != x)
            cur+=val;
        if(ans[node] == 1)
        {
            ans[x] = 1;
            for(auto v : nodes)
                vis[v] = 0;
            return;
        }
        for(auto u : adj[node])
        {
            pq.push({a[u] , u});
        }
    }
    bool acc = 1;
    if((int)nodes.size() != n)
        acc = 0;
    for(auto u : nodes)
        vis[u] = 0;
    if(acc)
    {
        ans[x] = 1;
        for(auto u : possible)
            ans[u] = 1;
    }
    else
    {
        for(auto p : nodes)
        {
            ans[p] = 0;
        }
        ans[x] = 0;
    }
}
signed main()
{

//    n = 2e5 , m = n - 1;
    cin>>n>>m;
    vector<pair<int ,int>> ve;
//    int f[10] = {1 , 2 , 5 , 10 , 20 , 6 , 7 , 18 , 40 , 31};
    fore(i , n)
    {

//        a[i] = f[rand()%10];
        cin>>a[i];
        ve.pb({a[i] , i});
    }
    sort(ve.begin() , ve.end());
    fore(i , m)
    {
        int u , v;
//        u = i + 1 ;
//        v = i + 2;
        cin>>u>>v;
        u-- , v--;
        adj[u].pb(v);
        adj[v].pb(u);
    }
//    int cnt = 0;
    for(auto [val , i] : ve)
    {
        if(ans[i] == -1)
        {
            expand(i);
        }
    }
    fore(i , n)
    {
        cout<<ans[i];
    }
}

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