题解 | 添加逗号
添加逗号
https://www.nowcoder.com/practice/f51c317e745649c0900996fd3f683aed
#include <iostream>
#include<string>
using namespace std;
int main() {
string s;
cin>>s;
int n=s.size()-1;
for(int i=1;i<=n/3;i++)
s.insert(n-3*i+1,",");
cout<<s;
}
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