Submission #973102

#	Time	Username	Problem	Language	Result	Execution time	Memory
973102		Unforgettablepl	Bridges (APIO19_bridges)	C++17	14 / 100	78 ms	12992 KiB

bridges

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

#define int long long

struct UFDS{
    vector<int> siz,p;
    UFDS(int n):siz(n+1,1),p(n+1){iota(p.begin(),p.end(),0);}
    int findRoot(int x){
        return x==p[x] ? x : p[x]= findRoot(p[x]);
    }
    void unite(int a,int b){
        a = findRoot(a);
        b = findRoot(b);
        if(a==b)return;
        if(siz[b]>siz[a])swap(a,b);
        siz[a]+=siz[b];
        p[b] = a;
    }
};


int ans[100001];
UFDS dsu(50000);

int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    vector<pair<int,pair<int,int>>> edges;
    vector<tuple<int,int,int>> queries;
    int n,m;
    cin >> n >> m;
    for(int i=1;i<=m;i++){
        int a,b,c;cin>>a>>b>>c;
        edges.emplace_back(c,make_pair(a,b));
    }
    int q;
    cin >> q;
    for(int i=1;i<=q;i++){
        int type,a,b;cin>>type>>a>>b;
        queries.emplace_back(b,a,i);
    }
    sort(edges.rbegin(), edges.rend());
    sort(queries.rbegin(), queries.rend());
    auto iter = edges.begin();
    for(auto[wt,x,idx]:queries){
        while(iter!=edges.end() and iter->first>=wt){
            dsu.unite(iter->second.first,iter->second.second);
            iter++;
        }
        ans[idx] = dsu.siz[dsu.findRoot(x)];
    }
    for(int i=1;i<=q;i++)cout<<ans[i]<<'\n';
}

• Subtask 1: 0 / 13
• Subtask 2: 0 / 16
• Subtask 3: 0 / 17
• Subtask 4: 14 / 14
• Subtask 5: 0 / 13
• Subtask 6: 0 / 27