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#include <iostream>
using namespace std;
int n, ans, arr[101];
int main() {
cin >> n;
for (int i = 0;i < n;i++)
cin >> arr[i];
for (int i = n - 1; i > 0; i--) {
if (arr[i - 1] >= arr[i]) {
ans+=arr[i - 1] - (arr[i] - 1);
arr[i - 1] = arr[i] - 1;
}
}
cout << ans;
}
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cs |
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