이상한 문자 만들기

https://programmers.co.kr/learn/courses/30/lessons/12930

기초적인 문제이다.

#include <iostream>
#include <deque>
#include <list>
#include <queue>
#include <stack>
#include <cstdio>
#include <vector>
#include <cstring>
#include <string>
#include <math.h>
#include <algorithm>
#include <map>
#include <set>
 
#pragma warning(disable:4996)  
#pragma comment(linker, "/STACK:336777216")
 
using namespace std;
 
string solution(string s) 
{
    string answer = "";
 
    int pos = 0;
 
    for (int i = 0; i < s.length(); i++)
    {
        if (!(pos % 2)) answer += ('a' <= s.at(i) && s.at(i) <= 'z') ? s.at(i) -= 'a' - 'A' : s.at(i);    
        else answer += ('A' <= s.at(i) && s.at(i) <= 'Z') ? s.at(i) += 'a' - 'A' : s.at(i);
 
        ++pos;
 
        if (s.at(i) == ' ') pos = 0;
    }
    
    return answer;
}
 
int main(void)
{
    cout << solution("try hello world") << '\n';
 
    return 0;
}