Submission #767584

#	Time	Username	Problem	Language	Result	Execution time	Memory
767584		Essa2006	Synchronization (JOI13_synchronization)	C++14	30 / 100	386 ms	20608 KiB

synchronization

#include<bits/stdc++.h>
using namespace std;
#define ll long long 
#define endl '\n'
#define FF first
#define SS second
#define all(a) a.begin(), a.end()
#define mod (ll)(1000000007)
const int inf=1e9;
int n, q1, q2, m;
vector<vector<int>>A;
map<int, pair<int, int>>mp;

void pre(){
    A.clear(), mp.clear();
    A.resize(n+1);
    m=n-1;
}
int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);
    cin>>n>>q1>>q2;
    pre();
    int cnt=1;
    while(m--){
        int u, v;
        cin>>u>>v;
        if(u>v)
            swap(u, v);
        A[u].push_back(v);
        A[v].push_back(u);
        mp[cnt++]={u, v};
    }
    vector<int>Mnf(n+1), Mxf(n+1);
    for(int i=1;i<=n;i++){
        Mnf[i]=Mxf[i]=i;
    }
    set<array<int, 2>>S;
    for(int i=1;i<=n;i++){
        S.insert({i, i});
    }
    vector<bool>Active(n);
    while(q1--){
        int id;
        cin>>id;
        int u=mp[id].FF, v=mp[id].SS;
        int L=u, R=v;
        array<int, 2>a={u, inf};
        auto it=S.upper_bound(a);
        a=*--it;
        L=a[0];
        a={v, inf};
        it=S.upper_bound(a);
        a=*--it;
        R=a[1];
        if(!Active[id]){
            Mxf[L]=Mxf[R], Mnf[R]=Mnf[L];
            a={u, inf};
            it=S.upper_bound(a);
            S.erase(--it);
            a={v, inf};
            it=S.upper_bound(a);
            S.erase(--it);
            S.insert({L, R});
        }
        else{
            Mnf[u]=Mnf[v]=Mnf[L];
            Mxf[u]=Mxf[v]=Mxf[R];
            a={L, R};
            S.erase(a);
            S.insert({L, u});
            S.insert({v, R});
        }
        Active[id]=!Active[id];
    }
    for(int i=2;i<=n;i++){
        Mxf[i]=max(Mxf[i], Mxf[i-1]);
    }
    for(int i=n-1;i>=1;i--){
        Mnf[i]=min(Mnf[i], Mnf[i+1]);
    }
    while(q2--){
        int x;
        cin>>x;
        cout<<Mxf[x]-Mnf[x]+1<<endl;
    }
    
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 20
• Subtask 3: 10 / 10
• Subtask 4: 20 / 20
• Subtask 5: 0 / 40