Submission #378904

#	Time	Username	Problem	Language	Result	Execution time	Memory
378904		Atill83	Group Photo (JOI21_ho_t3)	C++14	100 / 100	425 ms	134508 KiB

Main

#include <bits/stdc++.h>
#define ff first
#define ss second
#define endl '\n'
using namespace std;
const long long INF = (long long) 1e18;
const int mod = (int) 1e9+7;
const int MAXN = (int) 5e3+5;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
ll n;
int a[MAXN];
int dp[MAXN];
int s[MAXN];

int arr[MAXN][MAXN], brr[MAXN][MAXN];


int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);cout.tie(nullptr);

    #ifdef Local
        freopen("C:/Users/Admin/Desktop/Yazilim/C/IO/int.txt","r",stdin);
        freopen("C:/Users/Admin/Desktop/Yazilim/C/IO/out.txt","w",stdout);
    #endif



    cin>>n;
    for(int i = 1; i <= n; i++){
        cin>>a[i];
    }
    for(int i = 1; i <= n; i++){
        dp[i] = mod;
        for(int j = a[i]; j <= n; j++)
            s[j]++;

        for(int j = a[i]; j <= n; j++){
            arr[a[i]][j] = s[n] - s[j];
            brr[a[i]][j] = (j - a[i]) - (s[j] - s[a[i]]);
        }
    }

    for(int i = 1; i <= n; i++){
        int sum = 0;
    
        for(int j = i; j >= 1; j--){
            sum += arr[j][i] + brr[j][i];
            dp[i] = min(dp[i], dp[j - 1] + sum);
        }
    }

    cout<<dp[n]<<endl;


    #ifdef Local
        cout<<endl<<fixed<<setprecision(2)<<1000.0 * clock() / CLOCKS_PER_SEC<< " milliseconds ";
    #endif
}

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