// 1094. Increasing Array #include using namespace std; int main() { static int arr_size; static long long arr, curr, cnt; scanf("%d", &arr_size); scanf("%lld", &curr); for (int i = 1; i < arr_size; i++) { scanf("%lld", &arr); curr = max(curr, arr); cnt += (curr - arr); } printf("%lld\n", cnt); }