6. Parentheses Nesting | Index << >> |
depth ← {+\1 ¯1 0['()'⍳⍵]} x ← '⍵((∇<S),=S,(∇>S))⍵⌷⍨?≢⍵' ⍉ x , ⍪depth x ⍵ ( ( ∇ < S ) , = S , ( ∇ > S ) ) ⍵ ⌷ ⍨ ? ≢ ⍵ 0 1 2 2 2 2 1 1 1 1 1 2 2 2 2 1 0 0 0 0 0 0 0 '()' ⍳ x 2 0 0 2 2 2 1 2 2 2 2 0 2 2 2 1 1 2 2 2 2 2 2 1 ¯1 0['()' ⍳ x] 0 1 1 0 0 0 ¯1 0 0 0 0 1 0 0 0 ¯1 ¯1 0 0 0 0 0 0 +\ 1 ¯1 0['()' ⍳ x] 0 1 2 2 2 2 1 1 1 1 1 2 2 2 2 1 0 0 0 0 0 0 0 ('('=x) - (x=')') 0 1 1 0 0 0 ¯1 0 0 0 0 1 0 0 0 ¯1 ¯1 0 0 0 0 0 0 +\ ('('=x) - (x=')') 0 1 2 2 2 2 1 1 1 1 1 2 2 2 2 1 0 0 0 0 0 0 0 |