Submission #671981

#	Time	Username	Problem	Language	Result	Execution time	Memory
671981		Lobo	Swap (BOI16_swap)	C++17	0 / 100	1 ms	340 KiB

swap

#include<bits/stdc++.h>
using namespace std;
const long long inf = (long long) 1e18 + 10;
const int inf1 = (int) 1e9 + 10;
#define int long long
#define dbl long double
#define endl '\n'
#define sc second
#define fr first
#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()
const int maxn = 4e5+10;

int n, p[maxn], id[maxn], ans[maxn];
vector<set<int>> st;
void join(int id1, int id2) {
    if(id1 == id2) return;
    if(st[id1].size() < st[id2].size()) swap(id1,id2);
    for(auto x : st[id2]) {
        id[x] = id1;
        st[id1].insert(x);
    }
}
void solve() {
    cin >> n;
    for(int i = 1; i <= n; i++) {
        cin >> p[i];
        id[p[i]] = i-1;
        st.pb(set<int>{});
        st.back().insert(p[i]);
    }

    for(int i = 1; i <= n; i++) {
        int a = inf, b = inf, c = inf;
        a = *st[id[p[i]]].begin();
        if(2*i <= n) b = *st[id[p[2*i]]].begin();
        if(2*i+1 <= n) c = *st[id[p[2*i+1]]].begin();

        int mn = min({a,b,c});
        st[id[mn]].erase(mn);
        ans[i] = mn;
        if(mn == c) {
            // cout << p[i] << " " << p[2*i] << endl;
            p[2*i+1] = p[2*i];
            p[2*i] = p[i];
            join(id[p[2*i]],id[p[2*i+1]]);
        }
        else if(mn == b) {
            p[2*i] = p[i];
        }
        // cout << i << " - " << a << " " << b << " " << c << endl;
        // for(int i = 1; i <= n; i++) {
            // cout << p[i] << " ";
        // }cout << endl << endl;
    }

    for(int i = 1; i <= n; i++) {
        cout << ans[i] << " ";
    }cout << endl;

}

int32_t main() {
    ios::sync_with_stdio(false); cin.tie(0);

    // freopen("in.in", "r", stdin);
    // freopen("out.out", "w", stdout);
    int tt = 1;
    // cin >> tt;
    while(tt--) {
        solve();
    }

}

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