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  1. #include<bits/stdc++.h> 
  2. using namespace std; 
  3. #define int long long 
  4. main() 
  5. { 
  6. 	ios_base::sync_with_stdio(false); 
  7. 	cin.tie(0); cout.tie(0); 
  8. 	int n; 
  9. 	cin >> n; 
  10. 	if (n%2 != 0) cout << (n/2)*(n/2+1); 
  11. 	else if (n%2 == 0 and n%4 != 0) cout << (n/2-2)*(n/2+2); 
  12. 	else cout << (n/2-1)*(n/2+1); 
  13. 	return 0; 
  14. }
Success #stdin #stdout 0.01s 5300KB
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7299345643830412287
https://ideone.com/iNYfHR
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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