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#include <iostream>
bool isLowerChar(char ch)
{
return ch >= 'a' && ch <= 'z';
}
char* sortLowerChars(const char* str)
{
const int ALPHABET_SIZE = 26;
int hist[ALPHABET_SIZE] = { 0 };
int newSize = 0;
while (*str != '\0')
{
if (isLowerChar(*str))
{
newSize++;
hist[*str - 'a']++;
}
str++;
}
char* result = new char[newSize + 1];
result[newSize] = '\0';
int resultIndex = 0;
for (int i = 0; i < ALPHABET_SIZE; i++)
{
while (hist[i] > 0)
{
result[resultIndex++] = 'a' + i;
hist[i]--;
}
}
return result;
}
int main()
{
char* result = sortLowerChars("bbzzAaaTYb");
std::cout << result << std::endl;
delete[] result;
}
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