@admin , please fulfil the above suggestions. 
XD
Can someone share what was the other question present in the contest.
Are you sure you can use Gaussian elimination here? There are m equations and n variables, m!= n
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Oob right…sorry i haven’t used gaussian elimination method,i asked my friend how to solve linear equations,and he suggested this…
Though u can refer this for m!=n case:
http://cp-algorithms.com/linear_algebra/linear-system-gauss.html