Run Error in some test cases

I am getting “Run Error” in some test cases. What does Run Error mean? Are we supposed to implement the node class for Linked List section problems or use the STL??
https://ide.codingblocks.com/s/479556

hello @gautam74

check now

error that occurs at runtime are called run error.
it case of linkedlist problem this problem may happen due to access of null pointer .

Are we supposed to implement the node class for Linked List section problems or use the STL??

…

its upto u . but since u are a beginner i will suggest to implement things on ur own

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