백준 16953번

https://www.acmicpc.net/problem/16953

16953번: A → B

#include <iostream>

using namespace std;

int main() {
	long input1, input2, result = 0;
	cin >> input1 >> input2;

	while (input2 >= input1) {

		if (input2 == input1) {
			cout << result + 1;
			return 0;
		}

		result++;
		if (input2 % 10 == 1) {
			input2 -= 1;
			input2 = input2 / 10;
		}
		else if (input2 %2 == 0){
			input2 = input2 / 2;
		}
		else {
			break;
		}
		
		
	}

	cout << "-1";
	return 0;

}

설계