fork download 
  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main()
  5. {
  6.     ios_base::sync_with_stdio(false);
  7.     cin.tie(nullptr);
  8.     cout.tie(nullptr);
  9.     if(fopen(".inp","r"))
  10.     {
  11.         freopen(".inp","r",stdin);
  12.         freopen(".out","w",stdout);
  13.     }
  14.  
  15.     int n;
  16.     cin >> n;
  17.  
  18.     vector<long long> h(n);
  19.     for(int i = 0; i < n; ++i) {
  20.         cin >> h[i];
  21.     }
  22.  
  23.     sort(h.begin(), h.end());
  24.  
  25.     vector<long long> p;
  26.     vector<bool> u(n, false);
  27.  
  28.     if (n % 2 == 0) {
  29.         int m = n / 2;
  30.         if ((h[m - 1] % 2) != (h[m] % 2)) {
  31.             cout << -1 << endl;
  32.             return 0;
  33.         }
  34.  
  35.         p.push_back(h[m - 1]);
  36.         p.push_back(h[m]);
  37.         u[m - 1] = true;
  38.         u[m] = true;
  39.  
  40.     } else {
  41.         int m = n / 2;
  42.         if ((h[m - 1] % 2) == (h[m] % 2)) {
  43.             p.push_back(h[m - 1]);
  44.             p.push_back(h[m]);
  45.             u[m - 1] = true;
  46.             u[m] = true;
  47.         } else if ((h[m - 1] % 2) == (h[m + 1] % 2)) {
  48.             p.push_back(h[m - 1]);
  49.             p.push_back(h[m + 1]);
  50.             u[m - 1] = true;
  51.             u[m + 1] = true;
  52.         } else {
  53.             p.push_back(h[m]);
  54.             p.push_back(h[m + 1]);
  55.             u[m] = true;
  56.             u[m + 1] = true;
  57.         }
  58.     }
  59.  
  60.     int l = 0, r = n - 1;
  61.     while (p.size() < n) {
  62.         while (u[l]) l++;
  63.         while (u[r]) r--;
  64.  
  65.         p.push_back(h[l]);
  66.         u[l] = true;
  67.  
  68.         if (l != r) {
  69.             p.push_back(h[r]);
  70.             u[r] = true;
  71.         }
  72.     }
  73.  
  74.     for(int i = 0; i < n; ++i) {
  75.         cout << p[i] << (i == n - 1 ? "" : " ");
  76.     }
  77.     cout << endl;
  78.  
  79.     return 0;
  80. }
Success #stdin #stdout 0.01s 5316KB
comments (?)
stdin 
Standard input is empty
stdout 
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https://ideone.com/8nkcrw
language:
C++14 (gcc 8.3)
created:
13 days ago
visibility:
public

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