Submission #1092736

#	Time	Username	Problem	Language	Result	Execution time	Memory
1092736		I_am_Polish_Girl	Group Photo (JOI21_ho_t3)	C++14	0 / 100	1 ms	460 KiB

Main

#pragma GCC optimize("Ofast")
#pragma GCC optimize("O3")
#pragma GCC optimization ("unroll-loops")

#include <vector>
#include <algorithm>
#include <map>
#include <set>
#include <unordered_map>
#include <unordered_set>
#include <stack>
#include <queue>
#include <cmath>
#include <random>
#include <chrono>
#include <iomanip>
#include <iostream>
#include <bitset>

#define int long long

using namespace std;


int log_ = 3;
int inf = 2000000000000000000;
int mod = 5;

int p = 505;

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

    int n;
    cin >> n;

    vector <int> a(n);

    for (int i = 0; i < n; i++)
        cin >> a[i];

    vector <int> pos(n + 1);

    for (int i = 0; i < n; i++)
        pos[a[i]] = i;

    vector <int> dp(n + 1 , inf);

    dp[n] = 0;

    for (int i = n; i >= 1; i--)
    {
        for (int s = 1; s <= n; s++)
        {
            if (i - s < 0)
                break;

            int c = 0;

            int x = i;
            for (int j = i - s; j < i; j++)
            {
                c += abs(pos[x] - j);
                x--;
            }

            dp[i - s] = min(dp[i - s], dp[i] + c);
        }
    }

    cout << dp[0]/2;
}

Compilation message (stderr)

Main.cpp:4: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    4 | #pragma GCC optimization ("unroll-loops")
      |

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