fork download
copy 
  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.  
  7.  
  8. const int M = 1000000007;
  9. const int N = 3e5+9;
  10. const int INF = 2e9+1;
  11. const int LINF = 2000000000000000001;
  12.  
  13. inline int power(int a, int b, int mod=M) {
  14.     int x = 1;
  15.     a %= mod;
  16.     while (b) {
  17.         if (b & 1) x = (x * a) % mod; 
  18.         a = (a * a) % mod;
  19.         b >>= 1;
  20.     }
  21.     return x;
  22. }
  23.  
  24.  
  25. //_ ***************************** START Below *******************************
  26.  
  27.  
  28.  
  29.  
  30. vector<int> a;
  31.  
  32. int distinctAtmostK(int n, int k){
  33.  
  34. 	unordered_map<int,int> mp;
  35.  
  36. 	int s = 0,  e = 0;
  37. 	int ct = 0;
  38.  
  39. 	while(e<n){
  40. 		mp[a[e]]++;
  41.  
  42. 		while(s<=e && mp.size() > k){
  43. 			mp[a[s]]--;
  44. 			if(mp[a[s]] == 0) mp.erase(a[s]);
  45. 			s++;
  46. 		}
  47.  
  48. 		ct += e-s+1;
  49. 		e++;
  50. 	}
  51. 	return ct;
  52. }
  53.  
  54. int consistency(int n){
  55.  
  56. 	int total = n*(n+1)/2;
  57. 	int t = (total+1)/2; // ceil
  58.  
  59.  
  60. 	//* 1 distinct element
  61. 	int s = 1;
  62.  
  63. 	//* max distinct elements in a[ ] 
  64. 	int e = n;
  65.  
  66. 	while(s<e){
  67. 		int mid = s + (e-s)/2;
  68.  
  69. 		if(distinctAtmostK(n, mid) >= t){
  70. 			e = mid;
  71. 		}
  72. 		else s = mid+1;
  73. 	}
  74.  
  75.  
  76. 	return e;
  77. }
  78.  
  79.  
  80.  
  81.  
  82.  
  83.  
  84.  
  85.  
  86.  
  87.  
  88.  
  89.  
  90.  
  91.  
  92.  
  93. int practice(int n){
  94.  
  95.  
  96.     return 0;
  97. }
  98.  
  99.  
  100.  
  101.  
  102.  
  103. void solve() {
  104.  
  105.     int n;
  106.     cin>> n;
  107.  
  108.     a.resize(n);
  109.     for(int i=0; i<n; i++) cin >> a[i];
  110.  
  111.     cout << consistency(n) << endl;
  112.  
  113.  
  114. }
  115.  
  116.  
  117.  
  118.  
  119.  
  120. int32_t main() {
  121.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  122.  
  123.     int t = 1;
  124.     cin >> t;
  125.     while (t--) {
  126.         solve();
  127.     }
  128.  
  129.     return 0;
  130. }
Success #stdin #stdout 0s 5328KB
comments (?)
stdin
copy 
2
6
1 2 3 1 4 3
4
1 2 1 4
stdout
copy 
2
2
https://ideone.com/Oj24oi
language:
C++14 (gcc 8.3)
created:
3 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!