445. 数字反转 字符串处理

Posted 2021-05-26 幽殇默

https://www.acwing.com/problem/content/447/

#include<cstdio>
#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
int main(void)
{
	string s; cin>>s;
	if(s[0]=='-') cout<<'-',s=s.substr(1);//去除第一位
	reverse(s.begin(),s.end());
	while(s.size()>1&&s[0]=='0') s=s.substr(1);//去除前导零
	cout<<s<<endl;
	return 0;
}