Just now I added 7 new challenges to Codr's ranked mode.
Four medium ones and 3 hard ones.
One of these challenges uses backtracking for creating all possible integer combinations from a given array, such that their sum equals a target value. It's pretty elegant implementation.
There are also two challenges that involve 2D matrix operations, a real brain twister, but nothing you can't handle.
Yesterday I've also improved the css/style of the input fields and buttons 💎
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