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  1. #include<bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. int n, dp[200005];
  6. pair<int, int> a[200005];
  7.  
  8. int main() {
  9.     cin >> n;
  10.     for (int i = 1; i <= n; i++) {
  11.         cin >> a[i].first;
  12.         a[i].second = 0;
  13.     }
  14.     for (int i = n + 1; i <= n * 2; i++) {
  15.         cin >> a[i].first;
  16.         a[i].second = 1;
  17.     }
  18.  
  19.     sort(a + 1, a + 2 * n + 1);
  20.  
  21.     /// 0 : mau den
  22.     /// 1 : mau trang
  23.     for (int i = 2; i <= 2 * n; i++) {
  24.         /// TH1 : ko noi duoc
  25.         dp[i] = dp[i - 1];
  26.         /// TH2 : noi duoc
  27.         if (a[i].second != a[i - 1].second)
  28.             dp[i] = max(dp[i], dp[i - 2] + 1);
  29.     }
  30.     cout << dp[2 * n];
  31.  
  32. }
  33.  
Success #stdin #stdout 0s 5280KB
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https://ideone.com/Thgw7o
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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