Submission #646767

#	Time	Username	Problem	Language	Result	Execution time	Memory
646767		Tenis0206	Stranded Far From Home (BOI22_island)	C++11	0 / 100	136 ms	19644 KiB

island

#include <bits/stdc++.h>
#define int long long

using namespace std;

int n,m;
int s[200005];

vector<pair<int,int>> e;

bool ok[200005];

int t[200005],sum[200005];

vector<int> l[200005];

int reprezentant(int nod)
{
    if(t[nod]==nod)
    {
        return nod;
    }
    return reprezentant(t[nod]);
}

void uneste(int x, int y)
{
    x = reprezentant(x);
    y = reprezentant(y);
    if(x==y)
    {
        return;
    }
    if(l[x].size() > l[y].size())
    {
        sum[x] += sum[y];
        t[y] = x;
        for(auto it : l[y])
        {
            l[x].push_back(it);
        }
    }
    else
    {
        sum[y] += sum[x];
        t[x] = y;
        for(auto it : l[x])
        {
            l[y].push_back(it);
        }
    }
}

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    cin>>n>>m;
    for(int i=1; i<=n; i++)
    {
        cin>>s[i];
    }
    for(int i=1; i<=m; i++)
    {
        int x,y;
        cin>>x>>y;
        if(s[x]>=s[y])
        {
            e.push_back({x,y});
        }
        else
        {
            e.push_back({y,x});
        }
    }
    for(int i=1; i<=n; i++)
    {
        t[i] = i;
        l[i].push_back(i);
        sum[i] = s[i];
        ok[i] = true;
    }
    sort(e.begin(),e.end());
    for(auto it : e)
    {
        int x = it.first;
        int y = it.second;
        swap(x,y);
        if(sum[reprezentant(x)] >= s[y])
        {
            uneste(x,y);
        }
        else
        {
            for(auto it2 : l[reprezentant(x)])
            {
                ok[it2] = false;
            }
        }
    }
    for(int i=1; i<=n; i++)
    {
        cout<<ok[i];
    }
    return 0;
}

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