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c++에서 정해지지 않은 갯수의 입력을 받을 때

#include 
#include 

using namespace std;

int N, M;
string str;

int main(void) {
	cin >> N >> M;
	cout << "N : " << N << ", M : " << M << '\n';

/**
   * cin >> 와 getline(cin, str) 사이에 '\n'이 섞여있으면 getline이 이걸 인식해버림
   * 따라서 cin.ignore(256, '\n')으로 '\n'을 제거해 준 다음 getline을 사용해야 한다.
   *

	cin.ignore(256, '\n');
	while(getline(cin, str)) {
		if(str.size() == 0) // 단순히 str == "\n"으로 하면 못잡아낸다. size == 0으로 해야 잡힌다
			break;
		cout << str << ' ' << str.size() << '\n';
	}
	return 0;
}

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