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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.  
  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. // 5
  28. // 4 5 5 2 4
  29.  
  30.  
  31. vector<int> a;
  32.  
  33. int consistency(int n) {
  34.  
  35. 	map<int,int> mp;
  36. 	for(int i=0; i<n; i++){
  37. 		mp[a[i]]++;
  38. 	}
  39.  
  40. 	int ans = 0;
  41. 	int ct = 0;
  42. 	for(auto& t : mp){
  43. 		ans += t.second * ct;
  44. 		ct++;
  45. 	}
  46.  
  47.     return ans;
  48.  
  49. }
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  72.  
  73. int practice(int n){
  74.  
  75.  
  76. }
  77.  
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  79.  
  80.  
  81.  
  82. void solve() {
  83.  
  84.     int n;
  85.     cin >> n;
  86.     a.resize(n);
  87.     for(int i=0; i<n; i++) cin >> a[i];
  88.  
  89.     cout << consistency(n) << endl ;
  90.  
  91.     // cout << practice(n) << endl;
  92.  
  93. }
  94.  
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  101.  
  102. int32_t main() {
  103.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  104.  
  105.     int t = 1;
  106.     // cin >> t;
  107.     while (t--) {
  108.         solve();
  109.     }
  110.  
  111.     return 0;
  112. }
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
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5
4 5 5 2 4
stdout
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6
https://ideone.com/TkaPRP
language:
C++14 (gcc 8.3)
created:
2 hours ago
visibility:
public

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