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  1. #include<stdio.h>
  2. #include<string.h>
  3. #include<stdlib.h>
  4. int main()
  5. {
  6.     char a[1000002];
  7.     int test,i,flag,check,l,m,k;
  8.     scanf("%d\n",&test);
  9.     while(test--)
  10.     {
  11.         flag=1;
  12.         gets(a);
  13.         l=strlen(a);
  14.         // baseof(length / 2) in integer.
  15.         k=l>>1; 
  16.         //printf("k=%d\n",k);
  17.         check=0;
  18.         for(i=0;i<l;i++)
  19.         {
  20.             if(a[i]!='9')
  21.             {
  22.                 flag=0;
  23.                 //printf("a\n");
  24.                 break;
  25.             }
  26.         }
  27.         //handaling case when 9, 99, 999 is given.(only 9s)
  28.         if(flag==1)
  29.         {
  30.             a[0]='1';
  31.             for(i=1;i<l;i++)
  32.             a[i]='0';
  33.             a[l]='1';
  34.             a[l+1]='\0';
  35.             check=1; //to check palindrom or not number
  36.         }
  37.  
  38.         flag=0;
  39.         if(check!=1)
  40.         {
  41.             for(i=0;i<k;i++)
  42.             {
  43.                 if(a[i]<a[l-1-i]){
  44.                 flag=-1;
  45.                 //printf("flag=-1\n");
  46.                 }
  47.                 else if(a[i]>a[l-1-i]){
  48.                 //printf("flag=1\n");
  49.                 flag=1;}
  50.                 a[l-1-i]=a[i];
  51.             }
  52.  
  53.             if(!(l&1))
  54.             m=k-1;
  55.             else m=k;
  56.             if(flag==0||flag==-1)
  57.             {
  58.                 i=0;
  59.                 while(a[m-i]=='9')
  60.                 {
  61.                     a[m-i]='0';
  62.                     a[l-1-m+i]='0';
  63.                     i++;
  64.                 }
  65.  
  66.                 a[m-i]++;
  67.                 a[l-1-m+i]=a[m-i];
  68.         }
  69.     }
  70.     printf("%s\n",a);
  71.     }
  72.     return 0;
  73. }
Success #stdin #stdout 0s 3148KB
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https://ideone.com/pfGBf9
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language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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