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  1. #include<bits/stdc++.h>
  2. #include <iostream>
  3. using namespace std;
  4. //const int N = 1e5+9;
  5. //char s[N];
  6.  
  7. int main() {
  8. 	// your code goes here
  9. 	int n; cin>>n;
  10. 	bool watched[n+1];
  11. 	for(int i = 1; i<n; i++){
  12. 		watched[i] = false; //initially everything is false
  13. 	}
  14. 	for( int i = 1; i<n; i++){
  15. 		int episode; cin>> episode;
  16. 		watched [episode]= true;
  17. 	}
  18. 	int not_watched = -1;
  19. 	for(int i = 1; i<n; i++){
  20. 		if(!watched[i]){
  21. 			not_watched = i;
  22.  
  23. 		}
  24. 	}
  25. 	cout << not_watched << endl;
  26. 	assert(not_watched != -1);
  27.  
  28. 	return 0;
  29. }
Success #stdin #stdout 0.01s 5304KB
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stdin
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stdout
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4
https://ideone.com/waO2Za
language:
C++14 (clang 8.0)
created:
15 days ago
visibility:
public

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