Submission #1012390

#	Time	Username	Problem	Language	Result	Execution time	Memory
1012390		hengliao	Swap (BOI16_swap)	C++17	0 / 100	1 ms	604 KiB

swap

#include<bits/stdc++.h>
#include <chrono>
#include <random>
using namespace std;

#define F first
#define S second
#define pb push_back
#define vll vector<ll>
#define pll pair<ll, ll>
typedef long long ll;

struct node{
    vll st;
    bool stop;

    node(){
        stop=0;
    }
};

const ll mxN=2e5+5;
const ll inf=1e18;

vector<node> tree;
ll n;
ll a[mxN];
bool used[mxN];

void solve(){
    memset(used, 0, sizeof(used));
	cin>>n;
    for(ll i=1;i<=n;i++){
        cin>>a[i];
    }
    tree.resize(n+1);
    for(ll i=1;i<=n;i++){
        tree[i].st.pb(a[i]);
    }
    vll ans(n+1);
    for(ll i=1;i<=n;i++){
        ll tar=i;
        ll mn=inf;
        ll type=1;
        for(auto &it:tree[i].st){
            if(!used[it]){
                mn=min(mn, it);
            }
        }
        /*while(tar>0){
            ll took=0;
            for(auto &it:tree[tar].st){
                if(!used[it]){
                    mn=min(mn, it);
                    took++;
                }
            }
            if(tree[tar].stop || took>=2){
                break;
            }
            tar/=2;
        }*/
        //if(i==3) cout<<f<<'\n';
        if(2*i<=n){
            if(a[2*i]<mn){
                type=2;
                mn=a[2*i];
            }
        }
        if(2*i+1<=n){
            if(a[2*i+1]<mn){
                type=3;
                mn=a[2*i+1];
            }
        }
        if(type==1){
            if(2*i<=n){
                tree[2*i].stop=1;
            }
            if(2*i+1<=n){
                tree[2*i+1].stop=1;
            }
        }
        else if(type==2){
            if(2*i+1<=n){
                tree[2*i+1].stop=1;
            }
            //tree[2*i].st.pb(f);
            for(auto &it:tree[i].st){
                tree[2*i].st.pb(it);
            }
        }
        else{
            //tree[2*i].st.pb(a[2*i+1]);
            //tree[i].st.pb(a[2*i]);
            for(auto &it:tree[i].st){
                tree[2*i].st.pb(it);
                tree[2*i+1].st.pb(it);
            }
            tree[2*i+1].st.pb(a[2*i]);
        }
        //cout<<i<<' '<<mn<<'\n';
        if(mn==inf){
            return;
        }
        assert(mn!=inf);
        ans[i]=mn;
        used[mn]=1;
    }
    for(ll i=1;i<=n;i++){
        cout<<ans[i]<<' ';
    }
    cout<<'\n';
}

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

	solve();
	return 0;
}

Compilation message (stderr)

swap.cpp: In function 'void solve()':
swap.cpp:42:12: warning: unused variable 'tar' [-Wunused-variable]
   42 |         ll tar=i;
      |            ^~~

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