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;
}