Problems
Brackets#1653
Easy · Dynamic programming · Strings
Collinear Points#1654
Very easy · Geometry
The Least Common Multiple#1655
Very easy · Number theory
Sorting#1656
Easy · Sorting
Rectangles#1657
Hard · Geometry
Factorial#1658
Very easy · Implementation
Game#1660
Easy · Dynamic programming
Aladdin's knapsack#1661
Easy · Knapsack
Bracket sequences#1663
Very easy · Brute force
Gold Rush#1664
Hard · Graphs · Dynamic programming
The Tower of Babel#1665
Easy · Dynamic programming
Mines#1666
Very easy · Geometry
Graph condensation#1667
Very easy · Graphs
Matching#1669
Very hard · Graphs · Graph matchings
The average distance#1670
Very easy · Graphs
Candy#1671
Medium · Dynamic programming
Olympiad#1672
Easy · Dynamic programming
Sim-sim#1673
Medium · Math · Prefix Sums
Air conditioner#1674
Very easy · Implementation
Square Digital Root#1675
Easy · Implementation
Fractal#1676
Easy · Dynamic programming
Snake#1677
Easy · Implementation
Gifts#1678
Easy · Implementation
Honest Chain#1679
Very easy · Prefix Sums
Hamiltonian cycle#1680
Easy · Graphs