题解 | #字符个数统计#

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int main() {
    string strInput;    //存放输入的字符串
    getline(cin, strInput);
    vector<char> vecChar;

    for (size_t i = 0; i < strInput.size(); i++) {
        char chTmp = strInput[i];
        if (chTmp>=0 && chTmp<=127) {
            vecChar.push_back(strInput[int(i)]);
        }
        
    }
	sort(vecChar.begin(), vecChar.end());
    vecChar.erase(unique(vecChar.begin(), vecChar.end()), vecChar.end());
    cout << vecChar.size() << endl;
}
// 64 位输出请用 printf("%lld")