线上OJ
洛谷：https://www.luogu.com.cn/problem/P5660 (opens in a new tab)
AcWing：https://www.acwing.com/file_system/file/content/whole/index/content/4184106/ (opens in a new tab)
核心思想
本题的长度只有8，送分题，读入时逐一判断即可
题解代码
#include <bits/stdc++.h>
using namespace std;
int main()
{
char c;
int cnt = 0;
for(int i = 0; i < 8; i++)
{
cin >> c;
if(c == '1') cnt++;
}
cout << cnt << endl;
return 0;
}