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;
struct dsu {
vector<int> parent, rank;
vector<vector<pair<int*, int>>> changes;
dsu(int size) : parent(size), rank(size, 1) {
iota(parent.begin(), parent.end(), 0);
}
int get(int u) {
return parent[u] == u ? u : get(parent[u]);
}
void unite(int u, int v) {
u = get(u), v = get(v);
changes.push_back({});
if (u != v) {
if (rank[u] < rank[v]) {
swap(u, v);
}
changes.back().reserve(2);
changes.back().push_back({&rank[u], rank[u]});
changes.back().push_back({&parent[v], parent[v]});
rank[u] += rank[v];
parent[v] = u;
}
}
void rollback() {
for (auto &[x, y] : changes.back()) {
*x = y;
}
changes.pop_back();
}
};
struct edge {
int from, to;
int weight;
};
bool operator>(edge a, edge b) {
return a.weight > b.weight;
}
const int BLOCK = 320;
int main() {
cin.tie(nullptr)->sync_with_stdio(false);
int N, M;
cin >> N >> M;
vector<edge> edges(M);
for (auto &[from, to, weight] : edges) {
cin >> from >> to >> weight;
from--, to--;
}
int Q;
cin >> Q;
vector<int> answer(Q, -1);
vector<tuple<int, int, int>> changes, queries;
vector<bool> is_changed(M), used(M);
for (int i = 0; i < Q; i++) {
int T;
cin >> T;
if (T == 1) {
int B, R;
cin >> B >> R;
B--;
is_changed[B] = true;
changes.push_back({i, B, R});
} else {
int S, W;
cin >> S >> W;
S--;
queries.push_back({i, S, W});
}
if ((Q - i - 1) % BLOCK == 0) {
vector<pair<edge, int>> sorted_edges(M);
for (int i = 0; i < M; i++) {
sorted_edges[i] = {edges[i], i};
}
sort(sorted_edges.begin(), sorted_edges.end(),
[](pair<edge, int>& a, pair<edge, int>& b) {
return a.first > b.first;
});
sort(queries.begin(), queries.end(),
[](tuple<int, int, int> a, tuple<int, int, int> b) {
return get<2>(a) > get<2>(b);
});
int ptr = 0;
dsu sets(N);
for (auto [j, S, W] : queries) {
while (ptr < M && sorted_edges[ptr].first.weight >= W) {
if (!is_changed[sorted_edges[ptr].second]) {
sets.unite(sorted_edges[ptr].first.from, sorted_edges[ptr].first.to);
}
ptr++;
}
int x = (int)changes.size();
for (int k = 0; k < (int)changes.size(); k++) {
if (get<0>(changes[k]) > j) {
x = k;
break;
}
}
int rollbacks = 0;
for (int k = x - 1; k >= 0; k--) {
if (!used[get<1>(changes[k])] && get<2>(changes[k]) >= W) {
auto [from, to, weight] = edges[get<1>(changes[k])];
sets.unite(from, to);
rollbacks++;
}
used[get<1>(changes[k])] = true;
}
for (int k = (int)changes.size() - 1; k >= x; k--) {
auto [y, B, R] = changes[k];
if (!used[B] && edges[B].weight >= W) {
used[B] = true;
sets.unite(edges[B].from, edges[B].to);
rollbacks++;
}
}
answer[j] = sets.rank[sets.get(S)];
for (int k = (int)changes.size() - 1; k >= 0; k--) {
used[get<1>(changes[k])] = false;
}
for (int k = 0; k < rollbacks; k++) {
sets.rollback();
}
}
for (auto [j, B, R] : changes) {
is_changed[B] = false;
edges[B].weight = R;
}
vector<tuple<int, int, int>>().swap(changes);
vector<tuple<int, int, int>>().swap(queries);
}
}
for (int i = 0; i < Q; i++) {
if (answer[i] != -1) {
cout << answer[i] << "\n";
}
}
}
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