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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int n;
  4. int cnt[100005];
  5. long long dp[100005][2];
  6.  
  7. main() {
  8.     ios_base::sync_with_stdio(false);
  9.     cin.tie(0); cout.tie(0);
  10.     freopen("TEST.inp", "r", stdin);
  11.     freopen("TEST.out", "w", stdout);
  12.     cin >> n;
  13.     for (int i = 1; i <= n; i++) {
  14.         int a;
  15.         cin >> a;
  16.         cnt[a]++;
  17.     }
  18.  
  19.     int _n = 1e5;
  20.     for (int i = 1; i <= _n; i++) {
  21.         dp[i][0] = max(dp[i - 1][0], dp[i - 1][1]);
  22.         dp[i][1] = dp[i - 1][0] + 1LL * cnt[i] * i;
  23.     }
  24.  
  25.     cout << max(dp[_n][0], dp[_n][1]) << '\n';
  26.  
  27.     return 0;
  28. }
  29.  
Success #stdin #stdout 0.01s 5424KB
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https://ideone.com/HLhBTN
language:
C++14 (gcc 8.3)
created:
15 hours ago
visibility:
public

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