code - https://ide.codingblocks.com/s/340220
error -
source.cpp: In function ‘long long int findlastidx(long long int*, long long int, long long int)’:
source.cpp:9:1: warning: control reaches end of non-void function [-Wreturn-type]
9 | }
| ^
Find last element
Hey @guptarahul3100
Line 8 should be
else return findlastidx(a,n-1,m) ;
otherwise u will not be returning anything which is why u are getting this error that control reaches end of function 
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