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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,S1=0,n,m,p;
  5.  
  6. int main()
  7. {
  8. cin>>n>>m>>p;
  9.  
  10. S=(n+1)*n*(m+1)*m/4;
  11. // cout<<S<<endl;
  12. p=p/2;
  13. for(int i=2;i<p;++i)
  14. {
  15. for(int j=1;j<=i-1;++j)
  16. {
  17. int x=j;
  18. int y=i-j;
  19. if(n-x+1>0&&m-y+1>0)
  20. {
  21. S-=(n-x+1)*(m-y+1);
  22. }
  23. }
  24. }
  25. cout<<S;
  26. }
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