http://poj.org/problem?id=2190 //* @author: 82638882@163.com import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner in=new Scanner(System.in); String a=in.next(); int t=0; int n=-1; for(int i=0;i< 10;i++) { char c=a.charAt(i); if(c!='?'&&c!='X'){ t+=(c-'0')*(10-i); } else if(c=='X') t+=10; else if(c=='?') n=10-i; } int ans=-1; if(n!=1) for(int i=0;i< 10;i++) { if((t+n*i)%11==0){ ans=i; break; } } else if(n==1) { for(int i=0;i< 11;i++) if((t+i)%11==0){ ans=i; break; } } if(ans==10) System.out.println("X"); else System.out.println(ans); } }
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