Submission #1040549

#	Time	Username	Problem	Language	Result	Execution time	Memory
1040549		anton	Dynamic Diameter (CEOI19_diameter)	C++17	24 / 100	5063 ms	27692 KiB

diameter

#include<bits/stdc++.h>

using namespace std;
#define int long long
#define pii pair<int, int>

int N, Q, W;
const int MAX_N = 1e5;

vector<unordered_map<int, int>> adj;


pii get_furthest(int u, int a){

    pii res ={0, u};
    for(auto e: adj[u]){
        if(e.first!=a){
            pii de = get_furthest(e.first, u);
            de.first += e.second;
            if(de.first>res.first){
                res = de;
            }
        }
    }
    return res;
}
signed main(){
    cin>>N>>Q>>W;
    adj.resize(N);

    vector<pii> edges;

    for(int i = 0; i<N-1; i++){
        int a, b, c;
        cin>>a>>b>>c;
        a--;b--;
        adj[a][b] = c;
        adj[b][a] = c;

        edges.push_back({a, b});
    }


    int last=  0;

    
    for(int i = 0; i<Q; i++){
        int d, e;
        cin>>d>>e;

        d = (d+last)%(N-1);
        e = (e +last)%W;

        int a = edges[d].first;
        int b=  edges[d].second;

        adj[a][b] = e;
        adj[b][a] =e;

        int u = get_furthest(0, -1).second;
        last = get_furthest(u, -1).first;

        cout<<last<<endl; 
    }
}

• Subtask 1: 11 / 11
• Subtask 2: 13 / 13
• Subtask 3: 0 / 7
• Subtask 4: 0 / 18
• Subtask 5: 0 / 24
• Subtask 6: 0 / 27