1023 Have Fun with Numbers (20分)

1.模拟*2运算

2.string的排序方法

3.string的逆序方法

#include<iostream>
#include<algorithm>
#include<vector>
#include<cstring>
#include<set>
#include<map>
#include<sstream>

using namespace std;

int main() {

	string s, ans="";
	cin >> s;
	int len = s.length(), flag = 0;
	for(int i=len-1; i>=0; i--) {
		int tmp = s[i]-'0';
		tmp = tmp*2+flag;

		if(tmp > 9) {
			flag = 1;
			tmp -= 10;
		} else flag = 0;

		ans += tmp+'0';
	}
	if(flag) {
		ans += '1';
	}
	string tmp = ans;
	sort(s.begin(), s.end());
	sort(tmp.begin(), tmp.end());
	
	
	if(s == tmp) {
		cout << "Yes" << endl;
	} else cout << "No" << endl;

	string tans(ans.rbegin(), ans.rend() );

	cout << tans << endl;

	return 0;
}