diff options
Diffstat (limited to 'leetcode/lc-504-base7.rkt')
| -rw-r--r-- | leetcode/lc-504-base7.rkt | 16 |
1 files changed, 0 insertions, 16 deletions
diff --git a/leetcode/lc-504-base7.rkt b/leetcode/lc-504-base7.rkt deleted file mode 100644 index 3e75052..0000000 --- a/leetcode/lc-504-base7.rkt +++ /dev/null @@ -1,16 +0,0 @@ -#lang racket - -(define/contract (convert-to-base7 num) - (-> exact-integer? string?) - (define (max-base-power n base [pow 1]) - (cond [(n . = . (expt base pow)) pow] - [(n . < . (expt base pow)) (sub1 pow)] - [else (max-base-power n base (add1 pow))])) - (define (add-next-digit n pow acc) - (cond [(= pow 0) (string-append acc (number->string n))] - [else (add-next-digit (remainder n (expt 7 pow)) - (sub1 pow) - (string-append acc - (number->string (quotient n (expt 7 pow)))))])) - (string-append (if (negative? num) "-" "") - (add-next-digit (abs num) (max-base-power (abs num) 7) "")))
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