Järjestys

#include <iostream>
const int N = 1<<17;
using namespace std;
int sp[N<<1];
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int n;
  cin >> n;
  int t[n];
  int mloc[n+1];
  for (int i = 0; i < n; ++i) cin >> t[i], mloc[t[i]] = i;
  cout << 4*n << endl;
  for (int i = 0; i < n; ++i) {
    int cur_i = mloc[n-i];
    int a = N, b = N+cur_i;
    while (a <= b) {
      if (a%2) cur_i -= sp[a++];
      if (!(b%2)) cur_i -= sp[b--];
      a >>= 1; b >>= 1;
    }
    int j = N+mloc[n-i];
    for (; j >= 1; j >>= 1) {
      sp[j]++;
    }
    cout << cur_i+1 << ' ' << n-i << ' ' << max(n-i-1, 1) << ' ' << max(cur_i, 1) << ' ';
  }
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED

Test 3

Group: 3

Verdict: ACCEPTED