結果

問題 No.3025 Chocol∀te
ユーザー 👑 potato167
提出日時 2025-04-17 09:48:17
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 843 ms / 2,000 ms
コード長 4,174 bytes
コンパイル時間 2,413 ms
コンパイル使用メモリ 213,308 KB
実行使用メモリ 39,352 KB
最終ジャッジ日時 2025-04-17 09:48:59
合計ジャッジ時間 29,495 ms
ジャッジサーバーID
(参考情報)
judge1 / judge5
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 1
other AC * 77
権限があれば一括ダウンロードができます

ソースコード

diff #

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

const int MAXN = 100000;
const int B = 450;  // threshold for heavy

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int N, M;
    cin >> N >> M;

    vector<unordered_set<int>> adj(N + 1);
    vector<int> deg(N + 1, 0);
    for (int i = 0; i < M; i++) {
        int x, y;
        cin >> x >> y;
        adj[x].insert(y);
        adj[y].insert(x);
        deg[x]++;
        deg[y]++;
    }

    vector<ll> A(N + 1);
    for (int i = 1; i <= N; i++) {
        cin >> A[i];
    }

    // heavy‐light initialization
    vector<bool> isHeavy(N + 1, false);
    vector<int> heavyIndex(N + 1, -1);
    vector<int> heavyNodes;
    vector<ll> heavySum; 
    vector< bitset<MAXN+1> > heavyBitsets; 

    // classify initial heavies
    for (int i = 1; i <= N; i++) {
        if (deg[i] > B) {
            heavyIndex[i] = heavyNodes.size();
            heavyNodes.push_back(i);
            isHeavy[i] = true;
            heavySum.push_back(0);
            heavyBitsets.emplace_back();
        }
    }
    // build heavy data
    for (int h = 0; h < (int)heavyNodes.size(); h++) {
        int u = heavyNodes[h];
        auto &bs = heavyBitsets[h];
        bs.reset();
        ll s = 0;
        for (int v : adj[u]) {
            bs.set(v);
            s += A[v];
        }
        heavySum[h] = s;
    }

    int Q;
    cin >> Q;
    while (Q--) {
        int t;
        cin >> t;
        if (t == 1) {
            int u, v;
            cin >> u >> v;
            bool added = false;
            if (adj[u].count(v)) {
                // remove edge
                adj[u].erase(v);
                adj[v].erase(u);
                deg[u]--; deg[v]--;
            } else {
                // add edge
                adj[u].insert(v);
                adj[v].insert(u);
                deg[u]++; deg[v]++;
                added = true;
            }
            // update existing heavies for u/v
            if (isHeavy[u]) {
                int h = heavyIndex[u];
                if (added) {
                    heavyBitsets[h].set(v);
                    heavySum[h] += A[v];
                } else {
                    heavyBitsets[h].reset(v);
                    heavySum[h] -= A[v];
                }
            }
            if (isHeavy[v]) {
                int h = heavyIndex[v];
                if (added) {
                    heavyBitsets[h].set(u);
                    heavySum[h] += A[u];
                } else {
                    heavyBitsets[h].reset(u);
                    heavySum[h] -= A[u];
                }
            }
            // dynamic classify newly heavy nodes
            for (int x : {u, v}) {
                if (!isHeavy[x] && deg[x] > B) {
                    // become heavy
                    int h = heavyNodes.size();
                    isHeavy[x] = true;
                    heavyIndex[x] = h;
                    heavyNodes.push_back(x);
                    heavySum.push_back(0);
                    heavyBitsets.emplace_back();
                    auto &bs2 = heavyBitsets[h];
                    bs2.reset();
                    ll s2 = 0;
                    for (int w : adj[x]) {
                        bs2.set(w);
                        s2 += A[w];
                    }
                    heavySum[h] = s2;
                }
            }
        }
        else if (t == 2) {
            int p;
            ll a;
            cin >> p >> a;
            ll delta = a - A[p];
            A[p] = a;
            // update sums of all heavies that are adjacent to p
            for (int h = 0; h < (int)heavyNodes.size(); h++) {
                if (heavyBitsets[h].test(p)) {
                    heavySum[h] += delta;
                }
            }
        }
        else if (t == 3) {
            int c;
            cin >> c;
            if (isHeavy[c]) {
                cout << heavySum[heavyIndex[c]] << "\n";
            } else {
                ll s = 0;
                for (int v : adj[c]) {
                    s += A[v];
                }
                cout << s << "\n";
            }
        }
    }

    return 0;
}
0