Submission #1151427

#	Time	Username	Problem	Language	Result	Execution time	Memory
1151427		irmuun	Group Photo (JOI21_ho_t3)	C++20	12 / 100	299 ms	436 KiB

Main

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define pb push_back
#define ff first
#define ss second
#define all(s) s.begin(),s.end()
#define rall(s) s.rbegin(),s.rend()

int main(){
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    int n;
    cin>>n;
    int p[n+5];
    for(int i=1;i<=n;i++){
        cin>>p[i];
    }
    int ans=1e9;
    for(int x=1;x<(1<<n);x++){
        vector<int>v;
        for(int i=0;i<n;i++){
            if(x&(1<<i)){
                v.pb(i+1);
            }
        }
        if(v.back()!=n) continue;
        int b[n+5];
        {
            int l=0;
            for(auto x:v){
                l++;
                b[l]=x;
                for(int i=l+1;i<=x;i++){
                    b[i]=b[i-1]-1;
                }
                l=x;
            }
        }
        int a[n+5];
        for(int i=1;i<=n;i++){
            a[i]=p[i];
        }
        int cur=0;
        for(int i=1;i<=n;i++){
            for(int j=1;j<=n;j++){
                if(a[j]==b[i]){
                    for(int k=j-1;k>=i;k--){
                        cur++;
                        swap(a[k],a[k+1]);
                    }
                    break;
                }
            }
        }
        ans=min(ans,cur);
    }
    cout<<ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 0 / 32
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36