Submission #713534

#	Time	Username	Problem	Language	Result	Execution time	Memory
713534		bin9638	Bridges (APIO19_bridges)	C++17	14 / 100	176 ms	18252 KiB

bridges

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define pb push_back
#define N 100010
#define ii pair<int,int>
#define fs first
#define sc second
#define ld double

struct canh
{
    int u,v,L;

    bool operator<(const canh&A)const
    {
        return L>A.L;
    }
}edge[N];

struct DSU
{
    int lab[N];

    void init()
    {
        memset(lab,-1,sizeof(lab));
    }

    int root(int u)
    {
        if(lab[u]<0)
            return u;
        return(lab[u]=root(lab[u]));
    }

    void update(int u,int v)
    {
        if((u=root(u))==(v=root(v)))
            return;
        if(lab[u]>lab[v])
            swap(u,v);
        lab[u]+=lab[v];
        lab[v]=u;
    }
}T;

int kq[N],n,m,q;
ii tv[N];
map<ii,vector<int>>mp;

int main()
{
    #ifdef SKY
    freopen("A.inp","r",stdin);
    freopen("A.out","w",stdout);
    #endif // SKY
    ios::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);
    cin>>n>>m;
    for(int i=1;i<=m;i++)
        cin>>edge[i].u>>edge[i].v>>edge[i].L;
    cin>>q;
    sort(edge+1,edge+1+m);
    for(int i=1;i<=q;i++)
    {
        cin>>tv[i].fs>>tv[i].sc>>tv[i].fs;
        mp[tv[i]].pb(i);
    }
    T.init();
    sort(tv+1,tv+1+q,greater<ii>());
    for(int i=1,pos=1;i<=q;i++)
    {
        while(pos<=m&&edge[pos].L>=tv[i].fs)
        {
            T.update(edge[pos].u,edge[pos].v);
            pos++;
        }
        int id=mp[tv[i]].back();
        mp[tv[i]].pop_back();
        kq[id]=-T.lab[T.root(tv[i].sc)];
    }
    for(int i=1;i<=q;i++)cout<<kq[i]<<"\n";
    return 0;
}

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