Runtime Error in Rupsa and the Game | CodeChef

why is it showing segmentation fault (SIGSEGV) for my solution:

Please either format your code or (better!) link to your submission - no one wants to squint at a PNG :slight_smile:

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Fails 100% reproducibly for me using the sample testcase:

echo "2
1 2
1 2 1" | ./a.out
karthik2_1-RGAME.cpp:107:29: runtime error: member access within null pointer of type 'struct node'
Segmentation fault (core dumped)
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yes bro i know that, but why is it showing runtime error?, is there some problem in the logic?