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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. typedef long long ll;
  5. const ll lim = 2e5 + 10;
  6. ll n, a[lim], l, r, ans, m[lim];
  7.  
  8. int main() {
  9.     ios_base::sync_with_stdio(0);
  10.     cin.tie(0); cout.tie(0);
  11.  
  12.     cin >> n;
  13.     for (ll i = 1; i <= n; i++) cin >> a[i];
  14.  
  15.     l = 1;
  16.     for (ll r = 1; r <= n; r++) {
  17.         m[a[r]]++;
  18.         while (m[a[r]] > 1 && l < r) {
  19.             m[a[l]]--;
  20.             l++;
  21.         }
  22.         ans += r - l + 1;
  23.     }
  24.  
  25.     cout << ans;
  26.     return 0;
  27. }
Success #stdin #stdout 0s 5312KB
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https://ideone.com/vA2jwI
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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