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Mar 30th, 2020
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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. long long S,n,m,p,g;
  5.  
  6. int main()
  7. {
  8. cin>>n>>m>>p;
  9. if(p%2==1)
  10. {
  11. p+=1;
  12. }
  13. S=(n+1)*n*(m+1)*m/4;
  14. // cout<<S<<endl;
  15. p=p/2;
  16. for(int i=2;i<p;++i)
  17. {
  18. for(int j=1;j<=i-1;++j)
  19. {
  20. int x=j;
  21. int y=i-j;
  22. if(n-x+1>0&&m-y+1>0)
  23. {
  24. S-=(n-x+1)*(m-y+1);
  25. }
  26. }
  27. }
  28. cout<<S;
  29. }
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