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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. const int N=1500;
  4. const int inf=0x3f3f3f;
  5.  
  6. int main()
  7. {
  8. 	int n,k,w;cin>>k>>n>>w;
  9. 	int sum=0,ans=0;
  10. 	for (int i=1;i<=w;i++)
  11. 	{
  12. 		sum+=i*k;
  13. 	}
  14. 	ans=abs(sum-n);
  15. 	cout<<ans<<endl;
  16. }
Success #stdin #stdout 0s 3472KB
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https://ideone.com/tGgAET
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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