23 lines
417 B
C++
23 lines
417 B
C++
// Increasing Array
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#include<bits/stdc++.h>
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using namespace std;
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typedef long long ll;
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int main() {
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int n;
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cin >> n;
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vector<ll> array(n);
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for (auto &e : array) cin >> e;
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ll count = 0;
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for (int i = 1; i < n; i++) {
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if (array[i] < array[i-1]) {
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count += array[i-1] - array[i];
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array[i] = array[i-1];
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}
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}
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cout << count << endl;
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return 0;
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}
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