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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int main() {
  4. 	int n,m;
  5. 	cin>>n>>m;
  6. 	vector<int> a(n), b(m);
  7. 	vector<int> pre(m),suf(m);
  8. 	for(int i=0;i<n;i++){
  9. 		cin>>a[i];
  10. 	}
  11. 	for(int i=0;i<m;i++){
  12. 		cin>>b[i];
  13. 	}
  14. 	int j=0;
  15. 	for(int i=0;i<n;i++){
  16. 		if(a[i]==b[j]){
  17. 			pre[j]=i;
  18. 			j++;
  19. 		}
  20. 		if(j==m){
  21. 			break;
  22. 		}
  23. 	}
  24. 	j=m-1;
  25. 	for(int i=n-1;i>=0;i--){
  26. 		if(a[i]==b[j]){
  27. 			suf[j]=i;
  28. 			j--;
  29. 		}
  30. 		if(j==-1){
  31. 			break;
  32. 		}
  33. 	}
  34. 	int ans=0;
  35. 	for (int i = 0; i < m; i++) {
  36.         int l = (i > 0) ? pre[i - 1] : -1;  // Handling edge case
  37.         int r = (i < m - 1) ? suf[i + 1] : n; // Handling edge case
  38.         if (l < r) {
  39.             ans++;
  40.         }
  41.     }
  42.     cout<<ans;
  43.     return 0;
  44. }
Success #stdin #stdout 0.01s 5284KB
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stdin
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9 2
1 2 5 8 8 6 5 4 3
5 5
stdout
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2
https://ideone.com/aGCTiv
language:
C++ (gcc 8.3)
created:
5 days ago
visibility:
public

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