Submission #1332791

#	Time	Username	Problem	Language	Result	Execution time	Memory
1332791		Luvidi	Group Photo (JOI21_ho_t3)	C++20	64 / 100	5094 ms	456 KiB

Main

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

#define ll long long
#define pll pair<ll, ll>
#define pii pair<int, int>
#define fs first
#define sc second
#define pb push_back

void solve() {
    int n;
    cin>>n;
    int a[n+1];
    for(int i=1;i<=n;i++){
        int x;
        cin>>x;
        a[x]=i;
    }
    int dp[n+1];
    dp[0]=0;
    for(int i=1;i<=n;i++){
        dp[i]=1e9;
        int s=0;
        for(int j=i;j;j--){
            for(int k=j+1;k<=i;k++){
                s-=a[k]<a[j];
                s+=a[k]>a[j];
            }
            for(int k=1;k<j;k++){
                s+=a[k]>a[j];
            }
            dp[i]=min(dp[i],s+dp[j-1]);
        }
    }
    cout<<dp[n]<<'\n';
}

int main() {
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    solve();
}

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