JavaScript (ES7), 108 byte
Accetta input come una matrice di caratteri.
f=m=>(g=(y,X,V)=>m.map(r=>r.map((v,x)=>V?v>f&V>'a'>(x-X)**2+y*y-2?r[x]=n--:0:v<f?g(-y,x,v):n++)|y++))(n=0)|n
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Simile alla mia risposta originale, ma fare V>'a'>(x-X)**2+y*y-2è in realtà 1 byte più breve rispetto all'uso del trucco hexa descritto di seguito. ¯ \ _ (ツ) _ / ¯
JavaScript (ES7), 109 byte
Accetta input come una matrice di caratteri.
f=m=>(g=(y,X,V)=>m.map(r=>r.map((v,x)=>V?v>f&(x-X)**2+y*y<V-8?r[x]=n--:0:v<f?g(-y,x,'0x'+v):n++)|y++))(n=0)|n
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Come?
UN1= ( x1, y1)UN2= ( x2, y2)
Q ( A1, A2) = ( x2- x1)2+ ( y2- y1)2
Considerando le coordinate intere, appare come segue:
854585212541∙145212585458
Perciò:
- UN1UN2Q ( A1, A2) < 2
- UN1UN2Q ( A1, A2) < 3
238
- UN16- 810= 210
- B16- 810= 310
Commentate
f = // named function, because we use it to test if a character
// is below or above 'm'
m => ( // m[] = input matrix
g = ( // g is a recursive function taking:
y, // y = offset between the reference row and the current row
X, // X = reference column
V // V = reference value, prefixed with '0x'
) => //
m.map(r => // for each row r[] in m[]:
r.map((v, x) => // for each value v at position x in r[]:
V ? // if V is defined:
v > f & // if v is equal to 'v'
(x - X) ** 2 + // and the quadrance between the reference point and
y * y // the current point
< V - 8 ? // is less than the reference value read as hexa minus 8:
r[x] = n-- // decrement n and invalidate the current cell
: // else:
0 // do nothing
: // else:
v < f ? // if v is either 'a' or 'b':
g( // do a recursive call:
-y, // pass the opposite of y
x, // pass x unchanged
'0x' + v // pass v prefixed with '0x'
) // end of recursive call
: // else:
n++ // increment n
) | y++ // end of inner map(); increment y
) // end of outer map()
)(n = 0) // initial call to g with y = n = 0
| n // return n