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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define int long long
  5.  
  6. const long double PI = 3.14159265359;
  7.  
  8. void solve()
  9. {
  10.     int n;
  11.     cin >> n;
  12.     vector<int> arr(n);
  13.     for (auto &val : arr)
  14.         cin >> val;
  15.  
  16.     vector<int> freq(n + 1, 0);
  17.     int ans = 1;
  18.     for (int i = 0; i < n; i++)
  19.     {
  20.         if (i == 0 || arr[i] != arr[i - 1])
  21.             ans += i - freq[arr[i]];
  22.         freq[arr[i]]++;
  23.     }
  24.     cout << ans << '\n';
  25. }
  26.  
  27. signed main(void)
  28. {
  29.     ios_base::sync_with_stdio(0);
  30.     cin.tie(0);
  31.     cout.tie(0);
  32.     if (fopen("input.txt", "r"))
  33.     {
  34.         freopen("input.txt", "r", stdin);
  35.         freopen("output.txt", "w", stdout);
  36.     }
  37.     int t = 1;
  38.     // cin >> t;
  39.     while (t--)
  40.     {
  41.         solve();
  42.     }
  43.     return 0;
  44. }
Success #stdin #stdout 0s 5352KB
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https://ideone.com/DOdujb
language:
C++ (gcc 8.3)
created:
7 hours ago
visibility:
public

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