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  1. #include <bits/stdc++.h>
  2. #define ll long long
  3. #define N 100011
  4. using namespace std;
  5. ll n;
  6. ll a[N],t[N],m;
  7. map<ll,ll> mp;
  8. void update(ll pos,ll val) {
  9.     for (;pos<=m;pos+=pos&(-pos)) {
  10.         t[pos]=max(t[pos],val);
  11.     }
  12. }
  13. ll get(ll pos) {
  14.     ll ans=0;
  15.     for (;pos>0;pos-=pos&(-pos)) {
  16.         ans=max(ans,t[pos]);
  17.     }
  18.     return ans;
  19. }
  20. int main()
  21. {
  22.     ios_base::sync_with_stdio(false);
  23.     cin.tie(0);
  24.     cin >> n;
  25.     for (ll i=1;i<=n;i++) {
  26.         cin >> a[i];
  27.         mp[a[i]]++;
  28.     }
  29.     for (auto &x:mp) {
  30.         m++;
  31.         x.second=m;
  32.     }
  33.     for (ll i=1;i<=n;i++) a[i]=mp[a[i]];
  34.     ll ans=0;
  35.     for (ll i=1;i<=n;i++) {
  36.         update(a[i],1);
  37.         update(a[i],get(a[i]-1)+1);
  38.     }
  39.     cout << get(m) << endl;
  40. }
  41.  
Success #stdin #stdout 0.01s 5312KB
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https://ideone.com/e5DX7r
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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