PAT 1049

#include<cstdio>#include<iostream>#include<string>#include<string.h>#include<algorithm>#include<queue>#include<map>#include<set>using namespace std;int main(){	//freopen("input.txt","r",stdin);	int n,a=1;	int ans=0;	int left,now,right;	scanf("%d",&n);	while(n/a!=0)	{		left=n/(a*10);		now=n/a%10;		right=n%a;		if(now==0)			ans+=left*a;		else if(now==1)			ans+=left*a+right+1;		else 			ans+=(left+1)*a;		a*=10;	}	cout<<ans;	//freopen("con","r",stdin);	system("pause");	return 0;}