Submission #391110

#	Time	Username	Problem	Language	Result	Execution time	Memory
391110		Hegdahl	Swap (BOI16_swap)	C++17	0 / 100	1 ms	204 KiB

swap

#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(0);cin.tie(0);

  int n; cin >> n;

  vector<int> a(n);
  for (int &x : a) cin >> x;

  for (int i = 1; i+1 < n; i += 2) {
    int j = (i+1)/2 - 1;

    vector<int> vals(3);
    vals[0] = a[j];
    vals[1] = a[i];
    vals[2] = a[i+1];

    sort(vals.begin(), vals.end());

    int nxti = (i+1)*2-1;

    if (nxti+1 < n) {
      if (a[nxti] < vals[1] || a[nxti+1] < vals[1])
        swap(vals[1],vals[2]);
    } else if (nxti < n) {
      if (a[nxti] < vals[1] || a[nxti+1] < vals[1])
        swap(vals[1],vals[2]);
    }

    /*
    for (int x : a) cerr << x << ' ';
    cerr << '\n';
    cerr << j << ' ' << i << ' ' << i+1 << '\n'; // */

    a[j] = vals[0];
    a[i] = vals[1];
    a[i+1] = vals[2];
  }

  if (n%2 == 0) {
    int i = n-1;
    int j = (i+1)/2 - 1;
    if (a[i] < a[j]) swap(a[i], a[j]);
  }

  for (int x : a) cout << x << ' ';
  cout << '\n';

}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 11
• Subtask 3: 0 / 27
• Subtask 4: 0 / 20
• Subtask 5: 0 / 32