Dyalog APL Competition 2020 - Phase I solutions

phaseI.dyalog

((0>⊣)⌽((⊂↑),(⊂↓)))                    ⍝ 1. Let's Split
(⊢⊂⍨(128∘>∨191∘<))                     ⍝ 2. Characters
{26⊥⎕A⍳⍵}                              ⍝ 3. Columns
{(0=400|⍵)∨(≠⌿0=4 100∘.|⍵)}            ⍝ 4. Take a Leap
{⎕IO←0 ⋄ ⌽⍣(>/⍵)⊢(⌊/⍵)+⍳1+(⌈/-⌊/)⍵}    ⍝ 5. Stepping
{⍵[⍒⍺=⍵]}                              ⍝ 6. Move To Front
{⍺=2⊥bits∧⍺⊤⍨2⍴⍨≢bits←2⊥⍣¯1⊢⍵}         ⍝ 7. Bits
{(∨/(1 ¯1⍴⍨≢)⍷⍨(×2-/⊢))10⊥⍣¯1⊢⍵}       ⍝ 8. Zigzag
{peak←(⊢⍳⌈/),⍵ ⋄ notDesc←(⍳∘≢≡⍋) ⋄ (notDesc peak↑⍵) ∧ (notDesc ⌽peak↓⍵)}     ⍝ 9. Rise and fall
⍝ 10. Stacking It Up - not done