题解 | 添加逗号
添加逗号
https://www.nowcoder.com/practice/f51c317e745649c0900996fd3f683aed
#include <iostream>
using namespace std;
#include <string>
int main(){
string s;
cin >> s;
string res;
int ans = 0;
for(int i = s.size() -1 ;i>=0;i--){
++ans;
res += s[i];
if(ans % 3 == 0 && ans<s.size()){
res += ",";
}
}
for(int i = res.size() -1 ;i>=0;i--){
cout << res[i];
}
return 0;
}
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