Submission #576905

#	Time	Username	Problem	Language	Result	Execution time	Memory
576905		emad234	Exam (eJOI20_exam)	C++17	0 / 100	1 ms	340 KiB

exam

#include <bits/stdc++.h>
#define all(v) ((v).begin(),(v).end())
typedef long long ll;
using namespace std;
const int mod = 1e9 + 7;
const int mxN = 2e6 + 1;
int a[mxN];
int b[mxN];
int dp[mxN];
int main()
{
  ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
  int n;
  cin >>n;
  for(int i =0;i < n;i++){
    cin >>a[i];
  }
  for(int i = 0;i < n;i++){
    cin >>b[i];
  }
  for(int i = 0;i < n;i++){
    if(i != 0)
      dp[i] = dp[i - 1];
    if(i == 0){
      if(a[i] == b[i])
        dp[i] = 1;
    }
    else if(a[i] <= b[i]){
      for(int j = i;j >= 0;j--){
        if(a[j] == b[i]){
          dp[i] = max(dp[i - 1],dp[j] + 1);
        }
        if(a[j] > a[i])
          break;
      }
      for(int j = i;j < n;j++){
        if(a[j] == b[i]){
          dp[i] = max(dp[i],dp[i - 1] + 1);
        }
        if(a[j] > a[i])
          break;
      }
    }

  }
  cout <<dp[n - 1];
}































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