Submission #1121377

#	Time	Username	Problem	Language	Result	Execution time	Memory
1121377		PagodePaiva	Swap (BOI16_swap)	C++17	48 / 100	1046 ms	32016 KiB

swap

#include<bits/stdc++.h>
 
using namespace std;
 
const int N = 200010;
vector <int> v[N];
int p[N];
int mark[N];
vector <int> g[N];
int mark2[N];
int matching[N];
int off[N];
int mark3[N];

bool kuhn(int v){
    if(mark2[v]){
        return false;
    }
    mark2[v] = true;
    for(auto x : g[v]){
        if(off[x]) continue;
        if(matching[x] == -1){
            matching[x] = v;
            return true;
        }
        if(kuhn(matching[x])){
            matching[x] = v;
            return true;
        }
    }
    return false;
}
 
const int B = 100;

int main(){
    int n;
    cin >> n;
    for(int i = 1;i <= n;i++){
        cin >> p[i];
        v[i].push_back(p[i]);
    }
    for(int i = 2;i <= n;i++){
        set <int> s;
        for(auto x : v[i]){
            s.insert(x);
        }
        for(auto x : v[i/2]){
            s.insert(x);
        }
        v[i/2].clear();
        v[i].clear();
        for(auto x : s){
            v[i/2].push_back(x);
            v[i].push_back(x);
        }
    }
    for(int i = 1;i <= n;i++){
        for(auto x : v[i]){
            g[x+n].push_back(i);
            g[i].push_back(x+n);
        }
    }
    for(int i = 1;i <= 2*n;i++){
        sort(g[i].begin(), g[i].end());
    }
    vector <pair <int, int>> res;
    if(n > 1e3){
        for(int i = 1;i <= B;i++){
            for(auto x : g[i]){
                if(off[x]) continue;
                off[i] = 1;
                off[x] = 1;
                res.push_back({i, x});
            }
        }
    }
    for(int i = 1;i <= n;i++){
        if(off[i]) continue;
        for(auto x : g[i]){
            if(off[x]) continue;
            off[i] = 1;
            off[x] = 1;
            memset(matching, -1, sizeof matching);
            memset(mark3, 0, sizeof mark3);
            for(int i = 1;i <= n;i++){
                if(off[i]) continue;
                vector <int> idx;
                for(auto x : g[i]){
                    if(off[x]) continue;
                    if(matching[x] == -1){
                        matching[x] = i;
                        mark3[i] = 1;
                        break;
                    }
                }
            }
            for(int i = 1;i <= n;i++){
                if(off[i]) continue;
                if(mark3[i]) continue;
                memset(mark2, 0, sizeof mark2);
                kuhn(i);
            }
            bool aux = true;
            for(int i = n+1;i <= 2*n;i++){
                if(off[i]) continue;
                if(matching[i] == -1) aux = false;
            }
            if(aux){
                res.push_back({i, x});
                break;
            }
            off[i] = 0;
            off[x] = 0;
        }
    }
    for(auto x : res){
        cout << x.second-n << ' ';
    }
    cout << '\n';
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 11 / 11
• Subtask 3: 27 / 27
• Subtask 4: 0 / 20
• Subtask 5: 0 / 32