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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     ios::sync_with_stdio(false);
  6.     cin.tie(nullptr);
  7.  
  8.     int n;
  9.     if (!(cin >> n)) return 0;
  10.  
  11.     const int MAXV = 100000;
  12.     vector<long long> cnt(MAXV + 1, 0);
  13.     int x;
  14.     int maxv = 0;
  15.     for (int i = 0; i < n; ++i) {
  16.         cin >> x;
  17.         if (x >= 0 && x <= MAXV) {
  18.             cnt[x]++;
  19.             if (x > maxv) maxv = x;
  20.         }
  21.     }
  22.  
  23.     if (maxv == 0) {
  24.         cout << 0 << '\n';
  25.         return 0;
  26.     }
  27.  
  28.     vector<long long> dp(maxv + 1, 0);
  29.     dp[0] = 0;
  30.     dp[1] = cnt[1] * 1LL;
  31.  
  32.     for (int v = 2; v <= maxv; ++v) {
  33.         dp[v] = max(dp[v-1], dp[v-2] + cnt[v] * 1LL * v);
  34.     }
  35.  
  36.     cout << dp[maxv] << '\n';
  37.     return 0;
  38. }
Success #stdin #stdout 0.01s 5268KB
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https://ideone.com/c3ZElx
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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