1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
#include <iostream>
#include <vector>

int main()
{
	long long result = 0;

	int numberOfElements = 0;
	std::cin >> numberOfElements;

	std::vector<int> elements;
	elements.reserve(numberOfElements);

	for (auto i = 0; i < numberOfElements; i++)
	{
		int element = 0;
		std::cin >> element;
		elements.push_back(element);
	}

	for (auto i = 1; i < numberOfElements; ++i)
	{
		while (elements[i - 1] > elements[i])
		{
			result += 1;

			if (elements[i - 1] % 10 == 9)
			{
				elements[i] = elements[i] * 10;
			}
			else
			{
				elements[i] = elements[i] * 10 + elements[i - 1] % 10 + 1;
			}
		}
	}

	std::cout << result;
}