프로그래머스_전화번호부_C++

#include <string>
#include <vector>
#include <algorithm>

using namespace std;

bool solution(vector<string> phone_book) {
    bool answer = true;

    sort(phone_book.begin(), phone_book.end());
    
    for(int i = 0 ; i < phone_book.size() - 1;i++)
    {
        if (phone_book[i] == phone_book[i+1].substr(0, phone_book[i].length()))
                answer = false;
    }
    return answer;
}