Contest3182 - the 39th individual training match for 2021 freshmen_ C: [string] ISBN number

 

 The sample input  Copy
0-670-82162-4

 Sample output  Copy
Right

//
#include<bits/stdc++.h>
using namespace std;

const int MAXN=22;
char str[MAXN];

int main()
{
    int sum,cnt,ans,i;

    while( ~scanf("%s",str) )
    {
        sum=0; cnt=1;
        for( i=0;cnt!=10;i++ )
        {
            if( isdigit( str[i] ) )
            {
                sum+=( str[i]-'0' )*cnt;
                cnt++;
            }
        }
        ans=sum%11;

        if( ans==10 )           // 1-000-00001-1
        {
            if( str[12]=='X' )        printf("Right\n");
            else       { str[12]='X'; printf("%s\n",str); }
        }
        else if( ans+'0'==str[12] )   printf("Right\n");
        else       { str[12]=ans+'0'; printf("%s\n",str); }
    }
    return 0;
}

//
find:
01 
    9 1 3 == 13
    0~12 
02  Special judgement  'X'