为什么我在ideone和codechef编译器中而不是在我的终端中遇到运行时错误？

Question

I have just started competitive programming in SPOJ.I'm confused from sometime why i'm getting runtime error in ideone .The question is:

A positive integer is called a palindrome if its representation in the decimal system is the same when read from left to right and from right to left. For a given positive integer K of not more than 1000000 digits, write the value of the smallest palindrome larger than K to output. Numbers are always displayed without leading zeros.

Input

The first line contains integer t, the number of test cases. Integers K are given in the next t lines.

Output

For each K, output the smallest palindrome larger than K.

Example

Input:
2
808
2133

Output:
818
2222
My program:

  #include <stdio.h>

  int main(void)
 {
   int t,i,reverse,same;

   scanf("%d",&t);  //t is no. of test cases

     int num[t];  //num[t] is array of t elements

   for(i=0;i<t;i++)
    scanf("%d",&num[i]);

   i=0;     //since i will be equal to t therefore i is assigned to 0.

   while(t--)
   {    
    if(num[i]<=1000000)  
    {
    while(num[i]++)
        {
         reverse=0;
         same=num[i];     

         while(same>0)
         {
          reverse=reverse*10;
          reverse=reverse+same%10;
          same=same/10;
         }
     if(reverse==num[i])
      printf("%d",reverse);

     printf("\n");

     if(reverse==num[i])
      break;
     }
    }
    i++;     
   }
  return 0;
 }

I don't know where i'm wrong.I'm sorry i'm asking this question may this question is asked by someone before.I tried to find the result but could not get the answer. Thankyou in advance and sorry for my bad english.

Answer 1

The question doesn't say that the number will be less than 1000000. It says that the number has less than 1 million digits . A number with a million digits looks like this

591875018734106743196734198673419067843196874398674319687431986743918674319867431986743198674319876341987643198764319876341987643198764319876431987643198763419876431987643198764319876139876...

You can't use scanf to read a number that has a million digits, and you can't store that number in an int .

Answer 2

The most likely reason for your error to occur is some memory fault. Keep in mind that online judges/compilers limit your available memory and if you try to allocate/use more memory than available, you get a runtime error. This also happens on your machine, but usually you have a lot more memory available for your program than in the case of online judges.

In your case, you could reduce the memory usage of your program by changing the data type of the num array from int to something like short or even char.