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Nov 20th, 2018
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  1. #include<iostream>
  2. using namespace std;
  3. int a[2][1001000];
  4. int main()
  5. {
  6. // freopen("triangle.in","r",stdin);
  7. // freopen("triangle.out","w",stdout);
  8. int l,n;
  9. cin>>l>>n;
  10. int a[2][n];
  11. for(int i=0;i<n;i++)
  12. cin>>a[0][i]>>a[1][i];
  13. double smax=0,s;
  14. for(int i=0;i<n;i++)
  15. {
  16. s=l*a[0][i]/2;
  17. smax=max(s,smax);
  18. s=l*a[1][i]/2;
  19. smax=max(s,smax);
  20. s=l*(l-a[0][i])/2;
  21. smax=max(s,smax);
  22. s=l*(l-a[1][i])/2;
  23. }
  24. printf("%.1lf",smax);
  25. }
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