[DP] 백준-핸드폰번호 궁합 C++ 17202번

https://www.acmicpc.net/problem/17202

17202번: 핸드폰 번호 궁합

#include <iostream>  
#include <vector>
using namespace std;

int main()
{
	string a, b;
	vector<int> k1;
	vector<int> k2;

	cin >> a >> b;
	for (int i = 0; i < 8; i++)
	{
		k1.push_back(a[i] - '0');
		k1.push_back(b[i] - '0');
	}

	while (k1.size() != 2)
	{
		for (int i = 0; i < k1.size() - 1; i++)
		{
			k2.push_back((k1[i] + k1[i + 1]) % 10);
		}
		k1.clear();
		for (int i = 0; i < k2.size(); i++)
		{
			k1.push_back(k2[i]);
		}
		k2.clear();
	}

	for (int i = 0; i < k1.size(); i++)
		cout << k1[i];

	return 0;
}