Rome

Beautiful Triplets

binary search  frequency table  manifold 

Electronics Shop

2 pointers  sorting 

Equal Stacks

prefix sum 

Find the Missing Value

manifold  frequency-table  math 

Minimum Loss

binary search  patterns  sort 

Pairs

sorting  hashtable  binary-search 

Queue Using Two Stacks

constrained  stack 

Strong Password

manifold  bitset  design