Submission #1108077

#	Time	Username	Problem	Language	Result	Execution time	Memory
1108077		overwatch9	Group Photo (JOI21_ho_t3)	C++17	5 / 100	5060 ms	504 KiB

Main

#include <bits/stdc++.h>
using namespace std;
int main() {
    int n;
    cin >> n;
    vector <int> nums(n), pos(n+1);
    for (int i = 0; i < n; i++) {
        cin >> nums[i];
        pos[nums[i]] = i;
    }
    int ans = 1e9;
    vector <int> nums2(n);
    for (int i = 0; i < n; i++)
        nums2[i] = i+1;
    do {
        int cost = 0;
        bool valid = true;
        for (int i = 0; i+1 < n; i++) {
            if (nums2[i] >= nums2[i+1] + 2)
                valid = false;
        }
        if (!valid)
            continue;
        for (int i = 0; i < n; i++) {
            for (int j = i+1; j < n; j++) {
                if (pos[nums2[i]] > pos[nums2[j]])
                    cost++;
            }
        }
        ans = min(ans, cost);
    } while (next_permutation(nums2.begin(), nums2.end()));
    cout << ans << '\n';
}

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