Submission #876447

#	Time	Username	Problem	Language	Result	Execution time	Memory
876447		tch1cherin	다리 (APIO19_bridges)	C++17	100 / 100	1493 ms	9096 KiB

bridges

#pragma GCC optimize("Ofast,no-stack-protector")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2")
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("vpt")
#pragma GCC optimize("rename-registers")
#pragma GCC optimize("move-loop-invariants")
#pragma GCC optimize("unswitch-loops")
#pragma GCC optimize(3)
#pragma GCC optimize("O3")
#pragma GCC optimize("inline")
#pragma GCC optimize("-fgcse")
#pragma GCC optimize("-fgcse-lm")
#pragma GCC optimize("-fipa-sra")
#pragma GCC optimize("-ftree-pre")
#pragma GCC optimize("-ftree-vrp")
#pragma GCC optimize("-fpeephole2")
#pragma GCC optimize("-fsched-spec")
#pragma GCC optimize("-falign-jumps")
#pragma GCC optimize("-falign-loops")
#pragma GCC optimize("-falign-labels")
#pragma GCC optimize("-fdevirtualize")
#pragma GCC optimize("-fcaller-saves")
#pragma GCC optimize("-fcrossjumping")
#pragma GCC optimize("-fthread-jumps")
#pragma GCC optimize("-freorder-blocks")
#pragma GCC optimize("-fschedule-insns")
#pragma GCC optimize("inline-functions")
#pragma GCC optimize("-ftree-tail-merge")
#pragma GCC optimize("-fschedule-insns2")
#pragma GCC optimize("-fstrict-aliasing")
#pragma GCC optimize("-falign-functions")
#pragma GCC optimize("-fcse-follow-jumps")
#pragma GCC optimize("-fsched-interblock")
#pragma GCC optimize("-fpartial-inlining")
#pragma GCC optimize("-freorder-functions")
#pragma GCC optimize("-findirect-inlining")
#pragma GCC optimize("-fhoist-adjacent-loads")
#pragma GCC optimize("-frerun-cse-after-loop")
#pragma GCC optimize("inline-small-functions")
#pragma GCC optimize("-finline-small-functions")
#pragma GCC optimize("-ftree-switch-conversion")
#pragma GCC optimize("-foptimize-sibling-calls")
#pragma GCC optimize("-fexpensive-optimizations")
#pragma GCC optimize("inline-functions-called-once")
#pragma GCC optimize("-fdelete-null-pointer-checks")
#include <bits/stdc++.h>
using namespace std;
  
struct dsu_save {
    int v, rnkv, u, rnku;

    dsu_save() {}

    dsu_save(int _v, int _rnkv, int _u, int _rnku)
        : v(_v), rnkv(_rnkv), u(_u), rnku(_rnku) {}
};

struct dsu_with_rollbacks {
    vector<int> p, rnk;
    int comps;
    stack<dsu_save> op;

    dsu_with_rollbacks() {}

    dsu_with_rollbacks(int n) {
        p.resize(n);
        rnk.resize(n);
        for (int i = 0; i < n; i++) {
            p[i] = i;
            rnk[i] = 1;
        }
        comps = n;
    }

    int find_set(int v) {
        return (v == p[v]) ? v : find_set(p[v]);
    }

    bool unite(int v, int u) {
        v = find_set(v);
        u = find_set(u);
        if (v == u)
            return false;
        comps--;
        if (rnk[v] > rnk[u])
            swap(v, u);
        op.push(dsu_save(v, rnk[v], u, rnk[u]));
        p[v] = u;
        rnk[u] += rnk[v];
        return true;
    }

    void rollback() {
        if (op.empty())
            return;
        dsu_save x = op.top();
        op.pop();
        comps++;
        p[x.v] = x.v;
        rnk[x.v] = x.rnkv;
        p[x.u] = x.u;
        rnk[x.u] = x.rnku;
    }
};

struct edge {
  int from, to;
  int weight;
};
  
bool operator>(edge a, edge b) {
  return a.weight > b.weight;
}
  
const int BLOCK = 1050;
  
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_with_rollbacks 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])];
            rollbacks += sets.unite(from, to);
          }
          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;
            rollbacks += sets.unite(edges[B].from, edges[B].to);
          }
        }
        answer[j] = sets.rnk[sets.find_set(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";
    }
  }
}

• Subtask 1: 13 / 13
• Subtask 2: 16 / 16
• Subtask 3: 17 / 17
• Subtask 4: 14 / 14
• Subtask 5: 13 / 13
• Subtask 6: 27 / 27