Submission #597129

#	Time	Username	Problem	Language	Result	Execution time	Memory
597129		Valaki2	Dynamic Diameter (CEOI19_diameter)	C++14	7 / 100	203 ms	9032 KiB

diameter

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

#define int long long
#define pb push_back

const int maxn = 1e5;

struct edge {
    int to, wei;
    edge() : to(0), wei(0) {}
    edge(int to_, int wei_) :
        to(to_), wei(wei_) {}
};

int n, q, w;
vector<int> wei;
multiset<int> m;

int query() {
    int res = 0;
    auto it = m.rbegin();
    res += *it;
    it++;
    if(it != m.rend()) {
        res += *it;
    }
    return res;
}

void solve() {
    cin >> n >> q >> w;
    wei.assign(n - 1, 0);
    for(int i = 0; i < n - 1; i++) {
        int a, b, c;
        cin >> a >> b >> c;
        wei[i] = c;
        m.insert(c);
    }
    int last = 0;
    while(q--) {
        int d, e;
        cin >> d >> e;
        d = (d + last) % (n - 1);
        e = (e + last) % w;
        // ----- changable -----
        m.erase(m.find(wei[d]));
        wei[d] = e;
        m.insert(wei[d]);
        int result = query();
        // ----- changable -----
        cout << result << "\n";
        last = result;
    }
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    solve();
    return 0;
}

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