找字符串中不重复的字符的个数

找字符串中不重复的字符的个数

#include<iostream>
#include<string>
using namespace std;
int main()
{
	int count = 0;
	int num[128] = { 0 };
	string a;
	getline(cin, a);
	for (int i = 0; i < a.length(); i++)
	{
		if (a[i] >= 0 && a[i] <= 127)
		{
			num[a[i]]++;
		}
	}
	for (int i = 0; i < 127; i++)
	{
		if (num[i] != 0)
			count++;
	}
	cout << count;
}