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| #include <bits/stdc++.h>
#define int long long
#define N 200005
#define IOS ios::sync_with_stdio(0),cin.tie(0)
using namespace std;
int n,arr[N];
signed main(){
IOS;
cin>>n;
for(int i=0;i<n;i++)cin>>arr[i];
int ans = 0;
for(int i=1;i<n;i++){
if(arr[i] < arr[i-1]){
ans += arr[i-1] - arr[i];
arr[i] = arr[i-1];
}
}
cout<<ans<<"\n";
}
|