Submission #941621

#	Time	Username	Problem	Language	Result	Execution time	Memory
941621		TAhmed33	Festivals in JOI Kingdom 2 (JOI23_festival2)	C++98	10 / 100	9016 ms	432 KiB

festival2

#include <bits/stdc++.h>
using namespace std;
bool vis[17];
int a[9], b[9];
int n;
int cnt = 0;
void recurse (int pos) {
    if (pos == n + 1) {
        vector <pair <int, int>> dd;
        for (int i = 1; i <= n; i++) {
            dd.push_back({a[i], b[i]});
        }
        int c1 = 0, c2 = 0;
        sort(dd.begin(), dd.end());
        int prev = 0;
        for (auto i : dd) {
            if (i.first > prev) {
                c1++; prev = i.second;
            }
        }
        sort(dd.begin(), dd.end(), [&] (pair <int, int> &x, pair <int, int> &y) {
            return x.second < y.second;
        });
        prev = 0;
        for (auto i : dd) {
            if (i.first > prev) {
                c2++; prev = i.second;
            }
        }
        if (c1 < c2) cnt++;
        return;
    }
    int u; for (int i = 1; i <= 2 * n; i++) {
        if (!vis[i]) {
            u = i;
            break;
        }
    }
    a[pos] = u; vis[u] = 1;
    for (int i = 1; i <= 2 * n; i++) {
        if (!vis[i]) {
            vis[i] = 1;
            b[pos] = i;
            recurse(pos + 1);
            vis[i] = 0;
        }
    }
    vis[u] = 0;
}
int main () {
    cin >> n;
    recurse(1);
    cout << cnt << '\n';
}

Compilation message (stderr)

festival2.cpp: In function 'void recurse(int)':
festival2.cpp:39:12: warning: 'u' may be used uninitialized in this function [-Wmaybe-uninitialized]
   39 |     a[pos] = u; vis[u] = 1;
      |     ~~~~~~~^~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 0 / 27
• Subtask 4: 0 / 14
• Subtask 5: 0 / 36
• Subtask 6: 0 / 13