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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- long long n,i,x,sum=0;
- vector<long long>h;
- cin>>n;
- for(i=0;i<n;i++)
- {
- cin>>x;
- h.push_back(x);
- }
- for(i=n-1;i>0;i--)
- {
- sum+=(h[i]-h[i-1]);
- }
- sum+=h[0];
- cout<<sum;
- return 0;
- }
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