[编程题]字符个数统计

/位存储 c++ bitset， 省空间/

#include <iostream>
#include <bitset>

using namespace std;

int main(int argc, char* argv[])
{
    char c;
    int count;
    bitset<128> setTest(0);
    while (c = getchar())
    {
        if (c == '\n')
        {
            break;
        }
        setTest.set(c, 1);
    }
    cout << setTest.count() << endl;
    return 0;
}