[백준 1439: 뒤집기] - C++

www.acmicpc.net/problem/1439

1439번: 뒤집기

#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
 
int main()
{
	string n;
	cin >> n;

	char first = n[0];
	int num1 = 0;
	int num2 = 0;
	
	if (first == '0')
	{
		num1++;
	}
	else
	{
		num2++;
	}

	int i = 0;
	while(n[++i]!='\0')
	{
		if (n[i-1]!= n[i]) 
		{			
			if ('0' == n[i])
			{
				num1++;
			}
			else 
			{
				num2++;
			}				
		}

	}

	int result = min(num1, num2);
	cout << result << '\n';
	
	return 0;
}