제출 #1032919

#제출 시각아이디문제언어결과실행 시간메모리
1032919ASN49K다리 (APIO19_bridges)C++14
13 / 100
3048 ms7432 KiB
#define LOCAL 1
#include <bits/stdc++.h>
using namespace std;
using i64=long long;
#define all(x) x.begin(),x.end()
#define pb push_back
#define UNSET -1
const int N = 50'000;
namespace dsu_roll_back
{
    vector<int>t,sz;
    stack<int>sk;
    void roll_back()
    {
        while(sk.size())
        {
            sz[t[sk.top()]]-=sz[sk.top()];
            t[sk.top()]=sk.top();
            sk.pop();
        }
    }
    int root(int x)
    {
        if(t[x]!=x)
        {
            return root(t[x]);
        }
        return x;
    }
    void unite(int x,int y,bool roll)
    {
        x=root(x);
        y=root(y);
        if(sz[x]<sz[y])
        {
            swap(x,y);
        }
        if(x==y)
        {
            return;
        }
        t[y]=x;
        sz[x]+=sz[y];
        if(roll)
        {
            sk.push(y);
        }
    }
    void init(int n)
    {
        t=sz=vector<int>(n,1);
        iota(all(t) , 0);
    }
    int size(int x)
    {
        return sz[root(x)];
    }
}
//do not edge kids
struct edge
{
    int x,y,weight;
};
struct query
{
    int tip,poz,weight;
};
int n,m,q;
vector<edge>edges;
vector<query>querys;


void solve_batch(int l,int r)
{
    vector<bool>appears(m,false);
    for(int i=l;i<r;i++)
    {
        if(querys[i].tip==1)
        {
            appears[querys[i].poz]=true;
        }
    }

    vector<int>good;
    vector<int>bad;
    good.reserve(n);
    for(int i=0;i<m;i++)
    {
        if(!appears[i])
        {
            good.pb(i);
        }
        else
        {
            bad.pb(i);
        }
    }
    vector<int>ord_querys(r-l,0);
    iota(all(ord_querys) , l);
    sort(all(good) , [&](int x,int y){return edges[x].weight>edges[y].weight;});
    sort(all(ord_querys) , [&](int x,int y){
        if(querys[x].weight==querys[y].weight)
        {
            return querys[x].tip<querys[y].tip;
        }
        return querys[x].weight>querys[y].weight;
    });

    vector<int>::iterator it_good=good.begin();
    vector<int>::iterator it_ord_querys=ord_querys.begin();

    dsu_roll_back::init(n);
    for(;it_ord_querys!=ord_querys.end();it_ord_querys++)
    {
        for(;it_good!=good.end() && edges[*it_good].weight>=querys[*it_ord_querys].weight;it_good++)
        {
            dsu_roll_back::unite(edges[*it_good].x , edges[*it_good].y ,false);
        }




        if(querys[*it_ord_querys].tip==2)
        {
            cout<<dsu_roll_back::size(querys[*it_ord_querys].poz)<<'\n';
        }
        dsu_roll_back::roll_back();
    }

    for(int i=l;i<r;i++)
    {
        if(querys[i].tip==1)
        {
            edges[querys[i].poz].weight=querys[i].weight;
        }
    }
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cin>>n>>m;
    edges.resize(m);
    for(int i=0;i<m;i++)
    {
        int x,y,z;
        cin>>x>>y>>z;
        x--;
        y--;
        edges[i]={x,y,z};
    }
    cin>>q;
    querys.resize(q);
    for(int i=0;i<q;i++)
    {
        cin>>querys[i].tip>>querys[i].poz>>querys[i].weight;
        querys[i].poz--;
    }
    for(int i=0;i<q;i++)
    {
        solve_batch(i,i+1);
    }
    //solve_batch(0,q);
}
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