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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define int              long long int
  4. #define double           long double
  5. #define print(a)         for(auto x : a) cout << x << " "; cout << endl
  6. inline int power(int a, int b) {
  7.     int x = 1;
  8.     while (b) {
  9.         if (b & 1) x *= a;
  10.         a *= a;
  11.         b >>= 1;
  12.     }
  13.     return x;
  14. }
  15.  
  16.  
  17. const int M = 1000000007;
  18. const int N = 3e5+9;
  19. const int INF = 2e9+1;
  20. const int LINF = 2000000000000000001;
  21.  
  22. //_ ***************************** START Below *******************************
  23.  
  24. vector<int> a;
  25.  
  26. pair<int, vector<int>> consistency(int n){
  27.  
  28. 	sort(begin(a), end(a));
  29. 	vector<int> order(n);
  30.  
  31. 	int j = 0;
  32. 	for(int i=1; i<n; i+=2){
  33. 		order[i] = a[j];
  34. 		j++;
  35. 	}
  36. 	for(int i=0; i<n; i+=2){
  37. 		order[i] = a[j];
  38. 		j++;
  39. 	}
  40.  
  41. 	int ct = 0;
  42. 	for(int i=1; i<n-1; i+=2){
  43. 		if(order[i] < order[i-1] && order[i] < order[i+1]) ct++;
  44. 	}
  45.  
  46.  
  47. 	return {ct, order };
  48.  
  49. }
  50.  
  51. void solve() {
  52.  
  53.     int n;
  54.     cin>>n;
  55.  
  56.     a.resize(n);
  57.     for(int i=0; i<n; i++) cin >> a[i];
  58.  
  59.     auto ans = consistency(n);
  60.  
  61.     cout << ans.first << endl;
  62.     for(auto& it : ans.second){
  63.         cout << it << " ";
  64.     }cout << endl;
  65.  
  66.  
  67. }
  68.  
  69.  
  70.  
  71.  
  72.  
  73. int32_t main() {
  74.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  75.  
  76.     int t = 1;
  77.     // cin >> t;
  78.     while (t--) {
  79.         solve();
  80.     }
  81.  
  82.     return 0;
  83. }
Success #stdin #stdout 0.01s 5324KB
comments (?)
stdin
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5
1 2 2 4 5
7
1 3 2 2 4 5 4
6
4 1 4 4 4 4 
6
4 1 2 3 2 4
stdout
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2
2 1 4 2 5
https://ideone.com/9zvFXo
language:
C++14 (gcc 8.3)
created:
1 hour ago
visibility:
public

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