Submission #1131485

#	Time	Username	Problem	Language	Result	Execution time	Memory
1131485		vladilius	Collapse (JOI18_collapse)	C++20	5 / 100	1290 ms	72904 KiB

collapse

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
#define pb push_back
#define ff first
#define ss second
const int N = 4e5;
const int K = 255;

struct dsu{
    vector<int> sz, p, sizes;
    vector<pair<int&, int>> hist;
    int n;
    void init(int ns){
        n = ns;
        sz.resize(n + 1);
        p.resize(n + 1);
        for (int i = 1; i <= n; i++){
            sz[i] = 1;
            p[i] = i;
        }
    }
    int get(int v){
        return (v == p[v]) ? v : get(p[v]);
    }
    void unite(int x, int y){
        x = get(x); y = get(y);
        if (x == y) return;
        if (sz[x] > sz[y]) swap(x, y);
        hist.pb({p[x], p[x]});
        p[x] = y;
        hist.pb({sz[y], sz[y]});
        sz[y] += sz[x];
    }
    void check_point(){
        sizes.pb((int) hist.size());
    }
    int cc(){
        return n - (int) hist.size() / 2;
    }
    void roll_back(){
        while (hist.size() != sizes.back()){
            hist.back().ff = hist.back().ss;
            hist.pop_back();
        }
        sizes.pop_back();
    }
};

struct dsu1{
    vector<int> sz, p, rem;
    int n, cc1;
    void init(int ns){
        n = ns;
        sz.resize(n + 1);
        p.resize(n + 1);
        for (int i = 1; i <= n; i++){
            sz[i] = 1;
            p[i] = i;
        }
        cc1 = 0;
    }
    int get(int v){
        if (p[v] != v){
            p[v] = get(p[v]);
        }
        return p[v];
    }
    void unite(int x, int y){
        rem.pb(x); rem.pb(y);
        x = get(x); y = get(y);
        if (x == y) return;
        if (sz[x] > sz[y]) swap(x, y);
        p[x] = y;
        sz[y] += sz[x];
        cc1++;
    }
    void clear(){
        for (int i: rem){
            sz[i] = 1;
            p[i] = i;
        }
        cc1 = 0;
        rem.clear();
    }
};

vector<pii> ed[N], qs[N], d1[N], d2[N], f;
vector<int> out, mv;
int k, n;
dsu T[K];
dsu1 F;

void add(int v, int tl, int tr, int l, int r, pii x){
    if (l > tr || r < tl) return;
    if (l <= tl && tr <= r){
        ed[v].pb(x);
        return;
    }
    int tm = (tl + tr) / 2, vv = 2 * v;
    add(vv, tl, tm, l, r, x);
    add(vv + 1, tm + 1, tr, l, r, x);
}

void solve(int v, int tl, int tr){
    for (int j = 0; j < k; j++) T[j].check_point();
    for (auto [x, y]: ed[v]){
        int V = max(x, y);
        for (int j = 0; j < k; j++){
            auto [l, r] = f[j];
            if (V <= l){
                T[j].unite(x, y);
            }
        }
        d1[V].pb({x, y});
        V = min(x, y) - 1;
        for (int j = 0; j < k; j++){
            auto [l, r] = f[j];
            if (r <= V){
                T[j].unite(x, y);
            }
        }
        d2[V].pb({x, y});
    }
    if (tl == tr){
        for (auto [v, ii]: qs[tl]){
            for (int j = 0; j < k; j++){
                auto [l, r] = f[j];
                if (l <= v && v <= r){
                    for (int s = l + 1; s <= v; s++){
                        s = mv[s];
                        if (s > v) break;
                        for (auto [u1, u2]: d1[s]){
                            int v1 = T[j].get(u1);
                            int v2 = T[j].get(u2);
                            F.unite(v1, v2);
                        }
                    }
                    for (int s = v; s < r; s++){
                        s = mv[s];
                        if (s >= r) break;
                        for (auto [u1, u2]: d2[s]){
                            int v1 = T[j].get(u1);
                            int v2 = T[j].get(u2);
                            F.unite(v1, v2);
                        }
                    }
                    out[ii] = (T[j].cc() - F.cc1);
                    F.clear();
                    break;
                }
            }
        }
    }
    else {
        int tm = (tl + tr) / 2, vv = 2 * v;
        solve(vv, tl, tm);
        solve(vv + 1, tm + 1, tr);
    }
    for (int j = 0; j < k; j++){
        T[j].roll_back();
    }
    for (auto [x, y]: ed[v]){
        int V = max(x, y);
        d1[V].pop_back();
        V = min(x, y) - 1;
        d2[V].pop_back();
    }
}

vector<int> simulateCollapse(int N, vector<int> t, vector<int> x, vector<int> y, vector<int> w, vector<int> p){
    n = N;
    int m = (int) t.size();
    x.insert(x.begin(), 0);
    y.insert(y.begin(), 0);
    t.insert(t.begin(), 0);
    for (int i = 1; i <= m; i++){
        x[i]++; y[i]++;
    }
    int q = (int) w.size();
    for (int i = 0; i < q; i++){
        p[i]++; w[i]++;
    }
    
    const int S = 700;
    
    out.resize(q);
    vector<int> c1(n + 1);
    for (int i = 1; i <= m; i++){
        c1[max(x[i], y[i])]++;
        c1[min(x[i], y[i]) - 1]++;
    }
    int i = 1;
    while (i <= n){
        int j = i, sum = 0;
        while (j <= n && sum < S){
            sum += c1[j];
            j++;
        }
        f.pb({i, min(n, j)});
        i = j + 1;
    }

    k = (int) f.size();
    
    F.init(n);
    for (int i = 0; i < k; i++) T[i].init(n);
    
    mv.resize(n + 2); mv[n + 1] = n + 1;
    for (int i = n; i > 0; i--){
        if (c1[i]) mv[i] = i;
        else mv[i] = mv[i + 1];
    }
    
    map<pii, int> mp;
    for (int i = 1; i <= m; i++){
        if (x[i] > y[i]) swap(x[i], y[i]);
        if (!t[i]){
            if (mp.find({x[i], y[i]}) == mp.end()){
                mp[{x[i], y[i]}] = i;
            }
        }
        else {
            add(1, 1, m, mp[{x[i], y[i]}], i - 1, {x[i], y[i]});
            mp.erase({x[i], y[i]});
        }
    }
    
    for (auto tt: mp){
        add(1, 1, m, tt.ss, m, tt.ff);
    }
    
    for (int i = 0; i < q; i++) qs[w[i]].pb({p[i], i});
    solve(1, 1, m);
    return out;
}

• Subtask 1: 5 / 5
• Subtask 2: 0 / 30
• Subtask 3: 0 / 30
• Subtask 4: 0 / 35