CC 1.1

#include <iostream>
#include <cstring>
using namespace std;

bool Unique(string str)
{
	bool b[256] = {0};
	int len = str.length();
	for (int i = 0; i < len; ++i)
	{
		int temp = str[i];
		if (b[temp]) return false;
		b[temp] = true;

	}

	return true;
}



int main()
{
	string str1 = "hello", str2 = "abcd";
	cout <<Unique(str1) << " " << endl;
	cout <<Unique(str2) << " " << endl;
	return 0;
}

你好，能解释一下第七行是怎么实现给bool b数组的全部元素赋值的么？