Submission #1278730

#	Time	Username	Problem	Language	Result	Execution time	Memory
1278730		dosts	Group Photo (JOI21_ho_t3)	C++20	64 / 100	5017 ms	576 KiB

Main

#include <bits/stdc++.h>
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2")
#define int long long
#define pii pair<int,int>
#define vi vector<int>
#define ff first
#define ss second
#define sp << " " <<
#define all(x) x.begin(),x.end()
#define big(x) ((int)(x.size()))
using namespace std;
const int MOD = 1e9+7, LIM = 1e6+1, inf = 2e18;

const int N = 2e5+1;


void solve() {
    int n;
    cin >> n;
    vi a(n+1),pos(n+1);
    for (int i=1;i<=n;i++) cin >> a[i];
    for (int i=1;i<=n;i++) pos[a[i]] = i;
    vi dp(n+1,inf);
    dp[0] = 0;
    for (int i=0;i<n;i++) {
        //ilk i yere i sayıyı yerleştirdim
        int cost = 0;
        for (int j = i+1;j<=n;j++) {
            //[i+1..j] gelcek şimdi
            for (int k = i+1;k<=j-1;k++) {
                if (pos[k] > pos[j]) cost--;
            }
            for (int jj = 1;jj<pos[j];jj++) {
                if (a[jj] <= i) continue;
                cost++;
            }
            dp[j] = min(dp[j],dp[i]+cost);
        }
    }
    cout << dp[n] << '\n';
}   

signed main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    #ifdef Dodi
    freopen("in.txt", "r", stdin);
    freopen("out.txt", "w", stdout);
    #endif
    int t = 1;
    //cin >> t;
    while (t --> 0) solve();
}

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