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  1. #include<bits/stdc++.h>
  2. #define ll long long
  3. using namespace std ;
  4. const int MABU=1e6;
  5. vector<ll>a(MABU);
  6. vector<ll>b(MABU);
  7. int main()
  8. {
  9.     ios_base::sync_with_stdio(false);
  10.     cin.tie(0);
  11.     cout.tie(0);
  12.     freopen("MARBLE.INP","r",stdin);
  13.     freopen("MARBLE.OUT","w",stdout);
  14.     ll n;
  15.     cin>>n;
  16.     for(ll i = 0;  i< n ;i++)
  17.     {
  18.         cin>>a[i];
  19.     }
  20.     ll m ;
  21.     cin>>m;
  22.     for(ll i = 0 ; i<m;i++)
  23.     {
  24.         cin>>b[i];
  25.     }
  26.     vector<ll>d;
  27.     for(ll i =  m -2 ;i>=0;i--)
  28.     {
  29.         if(b[i]>b[i+1])
  30.             {
  31.                 for(ll j = i+1 ; j<=m;j++)
  32.                 {
  33.                     d.push_back(b[j]);
  34.                 }
  35.                 break;
  36.             }
  37.     }
  38.     ll res = 1 ;
  39.     for(ll i = 0;i<n;i++)
  40.     {
  41.         ll pos = lower_bound(d.begin(),d.end(),a[i])-d.begin();
  42.         if(a[i]>a[i+1])
  43.             break;
  44.         if(pos!=d.size())
  45.         res=max(res,((i+1)+(m-(pos+1))));
  46.         else
  47.             break;
  48.  
  49.     }
  50.     cout<<res<<endl;
  51.     return 0;
  52. }
  53. //3
  54. //1 4 9
  55. //4
  56. //5 2 4 5
  57.  
Success #stdin #stdout 0.01s 18728KB
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stdout 
Standard output is empty
https://ideone.com/GMkcqU
language:
C++ (gcc 8.3)
created:
16 days ago
visibility:
public

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