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- #include <iostream>
- #define Nmax 100000
- #define inf 1001
- using namespace std;
- int max_st[Nmax],max_dr[Nmax];
- int main()
- {
- int n,a[Nmax];
- cin>>n;
- for(int i=0;i<n;++i)
- cin>>a[i];
- max_st[0]=a[0];
- for(int i=1;i<n;++i)
- max_st[i]=max(a[i-1],max_st[i-1]);
- max_dr[n-1]=a[n-1];
- for(int i=n-2;i>=0;--i)
- max_dr[i]=max(a[i+1],max_dr[i+1]);
- int W=0;
- for(int i=0;i<n;++i)
- if(a[i]<max_st[i]&&a[i]<max_dr[i])
- W+=min(max_st[i],max_dr[i])-a[i];
- cout<<W;
- return 0;
- }
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