feat: Problem Filter Ideas

[ShivamSinghal1]

Problems to Upsolve (i.e. Problems not solved in Contest)

UVa - Filter Problems from CP3 Book.

Important Tags

Atcoder Contest - Begineer, Grand, Regular, Educational DP

SPOJ - Classical, Challenge, Partial, Tutorial, Riddle, Basics

Improvements -

Set per_page minimum bound 5.