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  1. #include<bits/stdc++.h>
  2. #include <iostream>
  3. #include<assert.h>
  4. using namespace std;
  5. //const int N = 1e5+9;
  6. //char s[N];
  7.  
  8. int main() {
  9. 	// your code goes here
  10. 	int n; cin>>n;
  11. 	bool watched[n+1];
  12. 	for(int i = 1; i<n; i++){
  13. 		watched[i] = false; //initially everything is false
  14. 	}
  15. 	for( int i = 1; i<n; i++){
  16. 		int episode; cin>> episode;
  17. 		watched [episode]= true;
  18. 	}
  19. 	int not_watched = -1;
  20. 	for(int i = 1; i<n; i++){
  21. 		if(!watched[i]){
  22. 			not_watched = i;
  23.  
  24. 		}
  25. 	}
  26. 	cout << not_watched << endl;
  27. 	assert(not_watched != -1);
  28.  
  29. 	return 0;
  30. }
Success #stdin #stdout 0.01s 5252KB
comments (?)
stdin 
10
3 8 10 1 7 9 6 5 2
stdout 
4
https://ideone.com/1Zwf2o
language:
C++14 (clang 8.0)
created:
15 days ago
visibility:
public

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