TREEORD WA SPOJ

general
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1

Problem link: SPOJ.com - Problem TREEORD

My code: https://hastebin.com/exivelihob.cpp

I am getting WA on Test case 6. I am unable to figure out what case I am missing. Could someone please suggest some corner cases so I could test my code and understand?

2

On my local computer your code outputs ‘yes’ for this input, but correct answer is ‘no’.

2
2 1
2 1
1 2

Also g++ prints some undefined behavior warnings:

treeord.cpp:51:5: warning: ‘rootindex’ may be used uninitialized in this function [-Wmaybe-uninitialized]
     if(nextindex>rootindex)
     ^~
treeord.cpp:38:5: warning: ‘nextindex’ may be used uninitialized in this function [-Wmaybe-uninitialized]
     if(nextindex<rootindex)