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V11WATER.cpp
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V11WATER.cpp
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#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> ii;
typedef unsigned long long ull;
#define X first
#define Y second
#define pb push_back
#define mp make_pair
#define ep emplace_back
#define EL printf("\n")
#define sz(A) (int) A.size()
#define FOR(i,l,r) for (int i=l;i<=r;i++)
#define FOD(i,r,l) for (int i=r;i>=l;i--)
#define fillchar(a,x) memset(a, x, sizeof (a))
#define faster ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
const int maxn = 200000;
int n,a[maxn],l[maxn],r[maxn];
long long res = 0;
int main() {
// freopen("INP.TXT", "r", stdin);
// freopen("OUT.TXT", "w", stdout);
scanf("%d",&n);
for (int i=1; i<=n; i++) scanf("%d",&a[i]);
for (int i=1; i<=n; i++) l[i] = max(l[i-1],a[i-1]);
for (int i=n; i>=1; i--) r[i] = max(r[i+1],a[i+1]);
for (int i=1; i<=n; i++) res += max((min(l[i],r[i])-a[i]),0);
printf("%lld",res);
return 0;
}