백준 10814 c++

#include <iostream>
#include <algorithm>

using namespace std;

struct profile {
	int age = 0;
	int num = 0;
	string name;
};

int input(int lower, int upper);
bool cmp(profile a, profile b);
string input_string(int max_len);
void input_profile(profile* profile_array, int size);
void sort_struct_array(profile* profile_array, int size);
void print_struct_array(profile* profile_array, int size);

int main(void)
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);

	profile *profile_arr;
	int i, N;

	N = input(1, 100000);
	profile_arr = new profile[N];

	input_profile(profile_arr, N);
	sort_struct_array(profile_arr, N);
	print_struct_array(profile_arr, N);

	delete[] profile_arr;

	return 0;
}

int input(int lower, int upper)
{
	int A;

	while (1)
	{
		cin >> A;
		if (A >= lower && A <= upper)
		{
			break;
		}
		else
		{
			;
		}
	}

	return A;
}

void input_profile(profile* struct_array, int size)
{
	int i;

	for (i = 0; i < size; i++)
	{
		struct_array[i].age = input(1, 200);
		struct_array[i].name = input_string(100);
		struct_array[i].num = i;
	}

	return;
}

string input_string(int max_len)
{
	string word;

	cin >> word;
	if (word.length() > max_len)
	{
		word = ' ';
	}
	else
	{
		;
	}

	return word;
}

void sort_struct_array(profile* struct_array, int size)
{
	sort(struct_array, struct_array + size, cmp);

	return;
}

bool cmp(profile a, profile b)
{
	if (a.age == b.age)
	{
		return a.num < b.num; //입력은 빠른순
	}
	else
	{
		return a.age < b.age; //나이는 어린순
	}
}

void print_struct_array(profile* struct_array, int size)
{
	int i;
	
	for (i = 0; i < size; i++)
	{
		cout << struct_array[i].age << " " << struct_array[i].name << "\n";
	}

	return;
}