SUDOKU PROBLEM BACKTRACK

#1

For the above given diagrams, the corresponding input to your program will be

[[53…7…], [6…195…], [.98…6.], [8…6…3], [4…8.3…1], [7…2…6], [.6…28.], […419…5], […8…79]]
and we would expect your program to modify the above array of array of characters to

[[534678912], [672195348], [198342567], [859761423], [426853791], [713924856], [961537284], [287419635], [345286179]]

https://ide.codingblocks.com/s/238159,why run time error for the above question??
It is sudoku solver ques,jus the output format diffeent

#2

added comments

#3

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