P5660 [CSP-J2019] 数字游戏 题解
代码
#include<bits/stdc++.h>
using namespace std;
string s;
int ans = 0;
int main() {
// freopen("number.in", "r", stdin);
// freopen("number.out", "w", stdout);
getline(cin, s);
for (int i = 0; i < s.size(); i++)
if (s[i] == '1') ans++;
printf("%d", ans);
return 0;
}