[백준 - 2577번] 숫자의 개수

• string foreach for 
  (char& c : str)
  {
  //code
  }

 

#include <iostream>
#include <string>
#include <map>

using namespace std;

int main(void)
{
	int A, B, C;
	int mul_three_num;
	map<int, int> m;

	cin >> A >> B >> C;
	mul_three_num = A * B * C;

	string str = to_string(mul_three_num);

	for (int i = 0; i < 10; i++)
	{
		m.insert(make_pair(i, 0));
	}

	for (char& c : str)
	{
		// char to int " = '0'"
		auto item = m.find(c - '0');
		item->second++;
	}

	for (int i = 0; i < 10; i++)
	{
		cout << m[i] << '\n';
	}

	if (str.empty() != 0) {
	}
	return 0;
}

 

[참고 자료]