What is the problem in this code? it runs good till first half then it creates problem

#1
#2

hi @yamangoyal100_ff74db54bdf01539 refer https://ide.codingblocks.com/s/666639

#3

please elaborate this condition:–>

#4

please elaborate this condition in this code :->https://ide.codingblocks.com/s/666639

#5

which condition u want to elaborate?