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Aug 18th, 2018
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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main()
  5. {
  6. long long n,i,x,sum=0;
  7. vector<long long>h;
  8. cin>>n;
  9. for(i=0;i<n;i++)
  10. {
  11. cin>>x;
  12. h.push_back(x);
  13. }
  14. for(i=n-1;i>0;i--)
  15. {
  16. sum+=(h[i]-h[i-1]);
  17. }
  18. sum+=h[0];
  19. cout<<sum;
  20. return 0;
  21. }
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