[프로그래머스]전화번호 목록 (C++/해시 Level 2)

https://school.programmers.co.kr/learn/courses/30/lessons/42577

프로그래머스

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문제 풀이

Algorithm 헤더의 Sort를 활용하여 해결했습니다.

#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());
    int size = phone_book.size();
    string beforeNum = phone_book[0];
    for (int i=0; i<size; i++)
    {
        if (phone_book[i].substr(0, beforeNum.size()) != beforeNum || i == 0)
        {
            beforeNum = phone_book[i];
            continue;
        }
        if (phone_book[i].substr(0, beforeNum.size()) == beforeNum) answer = false;
    }
    
    return answer;
}