이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include<bits/stdc++.h>
using namespace std;
using i64 = long long;
using pil = pair<int, i64>;
using pli = pair<i64, int>;
const int N = 1e5 + 5;
#define ALL(a) a.begin(), a.end()
struct edge {
int u, v;
i64 w;
edge(int u = 0, int v = 0, i64 w = 0) : u(u), v(v), w(w) {}
};
int n;
int tc;
vector<pil> adj[N];
vector<edge> e;
i64 ans = 0;
i64 last = 0;
i64 maxw = 0;
vector<pli> best[N];
void DFS(int u, int p) {
best[u].clear();
for(auto [v, w] : adj[u]) {
if(v == p)
continue;
DFS(v, u);
best[u].emplace_back(best[v].front().first + w, v);
}
best[u].emplace_back(0, u);
while(best[u].size() < 2)
best[u].emplace_back(0, 0);
sort(ALL(best[u]));
reverse(ALL(best[u]));
while(best[u].size() > 2)
best[u].pop_back();
}
void GET(int u, int p, i64 cur) {
ans = max(ans, best[u][0].first + best[u][1].first);
ans = max(ans, cur + best[u][0].first);
for(auto [v, w] : adj[u]) {
if(v == p)
continue;
i64 b = max(cur, best[u].front().second == v ? best[u].back().first : best[u].front().first) + w;
GET(v, u, b);
}
}
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cin >> n >> tc >> maxw;
for(int i = 1; i < n; i++) {
int u, v;
i64 w;
cin >> u >> v >> w;
e.emplace_back(u, v, w);
}
while(tc--) {
int p;
i64 w;
cin >> p >> w;
p = (p + last) % (n - 1);
w = (w + last) % maxw;
e[p].w = w;
for(auto [u, v, w] : e) {
// cout << u << " " << v << " " << w << "\n";
adj[u].emplace_back(v, w);
adj[v].emplace_back(u, w);
}
ans = 0;
DFS(1, 0);
GET(1, 0, 0);
cout << ans << "\n";
for(int i = 1; i <= n; i++)
adj[i].clear();
last = ans;
}
}
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