Nearest Smaller to left

[Priya272]

like if we have a array like
arr={2,7,4,8}
we need to find the nearest smaller no for each element in a array.
output:
{-1,2,2,4}

[Priya272]

@thisisshub please assign this issue to me.
i want to do this question using C++ as language and i will use stack data structure for this question