Submission #1050966

#	Time	Username	Problem	Language	Result	Execution time	Memory
1050966		sofijavelkovska	Stranded Far From Home (BOI22_island)	C++17	40 / 100	1088 ms	24312 KiB

island

#include <bits/stdc++.h>
using namespace std;

const int MAXN=300000, INF=2e9;
// 2e5 ??

int n, m;
int a[MAXN];
vector<int> adj[MAXN];

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin >> n >> m;
    for (int i=0; i<n; i++)
        cin >> a[i];
    for (int i=0; i<m; i++)
    {
        int x, y;
        cin >> x >> y;
        adj[x-1].push_back(y-1);
        adj[y-1].push_back(x-1);
    }
    set<int> values;
    for (int i=0; i<n; i++)
        values.insert(-a[i]);
    bool possible[n]={false};
    queue<int> q;
    for (auto kt : values)
    {
        int k=-kt;
        bool visited[n]={false};
        for (int i=0; i<n; i++)
        {
            if (a[i]!=k || visited[i])
                continue;
            visited[i]=true;
            long long sum=a[i];
            q.push(i);
            vector<int> nodes;
            nodes.push_back(i);
            int minsum=INF;
            while (!q.empty())
            {
                int x=q.front();
                q.pop();
                for (auto y : adj[x])
                {
                    if (a[y]<=k && !visited[y])
                    {
                        visited[y]=true;
                        sum=sum+a[y];
                        q.push(y);
                        if (a[y]==k)
                            nodes.push_back(y);
                    }
                    if (a[y]>k && possible[y])
                        minsum=min(minsum, a[y]);
                }
            }
            if (minsum>sum && k!=-(*values.begin()))
                continue;
            for (auto x : nodes)
                possible[x]=true;
        }
    }
    for (int i=0; i<n; i++)
        cout << possible[i];

    return 0;
}

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