diff options
| -rw-r--r-- | daily/287easy/kaprekar.c | 13 | ||||
| -rw-r--r-- | daily/287easy/kaprekar.pas | 31 |
2 files changed, 12 insertions, 32 deletions
diff --git a/daily/287easy/kaprekar.c b/daily/287easy/kaprekar.c index 3121d88..0cf1bf6 100644 --- a/daily/287easy/kaprekar.c +++ b/daily/287easy/kaprekar.c @@ -40,19 +40,14 @@ short desc_digits(short n) return a[0] * 1000 + a[1] * 100 + a[2] * 10 + a[3]; } -short asc_digits(short n) -{ - sort_digits(n); - - return a[3] * 1000 + a[2] * 100 + a[1] * 10 + a[0]; -} - unsigned long long kaprekar(short n) { char i; - for (i = 0; n ^ 6174; i++) - n = desc_digits(n) - asc_digits(n); + for (i = 0; n ^ 6174; i++) { + sort_digits(n); + n = (a[0] - a[3]) * 999 + (a[1] - a[2]) * 90; + } return i; } diff --git a/daily/287easy/kaprekar.pas b/daily/287easy/kaprekar.pas index 7378f2d..f7a7f46 100644 --- a/daily/287easy/kaprekar.pas +++ b/daily/287easy/kaprekar.pas @@ -1,5 +1,5 @@ -type - aos = array[0 .. 3] of shortint; +var + a: array[0 .. 3] of shortint; function largest_digit(n: smallint): shortint; var @@ -20,9 +20,8 @@ function largest_digit(n: smallint): shortint; exit(m) end; -function sorted_digits(n: smallint): aos; +procedure sort_digits(n: smallint); var - a: aos; i, j: shortint; begin @@ -38,31 +37,16 @@ function sorted_digits(n: smallint): aos; inc(a[i], a[j]); a[j] := a[i] - a[j]; dec(a[i], a[j]) - end; - - exit(a) + end end; function desc_digits(n: smallint): smallint; - var - a: aos; - begin - a := sorted_digits(n); + sort_digits(n); exit(a[0] * 1000 + a[1] * 100 + a[2] * 10 + a[3]) end; -function asc_digits(n: smallint): smallint; - var - a: aos; - - begin - a := sorted_digits(n); - - exit(a[3] * 1000 + a[2] * 100 + a[1] * 10 + a[0]) - end; - function kaprekar(n: smallint): qword; var i: shortint = 0; @@ -70,8 +54,9 @@ function kaprekar(n: smallint): qword; begin while n <> 6174 do begin - n := desc_digits(n) - asc_digits(n); - inc(i) + inc(i); + sort_digits(n); + n := (a[0] - a[3]) * 999 + (a[1] - a[2]) * 90 end; exit(i) |