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J = zeros(100);- R$ k3 z! C+ j7 O& a( v/ |
J(50:59,30:39)=1;6 G7 O R6 b& f
J(50:59,70:79)=1;0 u* X: e0 @; A7 r" E
J(50:59,50:59)=1;
, v+ P: a, i8 Z$ o: gJ(70:79,40:49)=1;
5 y+ s# }6 P8 W" [4 B6 G9 Z
* D" `* P. f2 w0 H[rows, columns] = size(J);
' q, O5 ~" A" ?& q! e: ^" `count = 0;2 A4 t: L, z* r! T
& x6 c2 |3 _7 {
% 找到一个值为1的点的坐标5 x& G: K/ u# [4 I+ d
[y, x] = find(J==1, 1);
% x, d) V$ [' ~$ }! Gwhile ~isempty(y). {) V8 B) G, L, f
count = count + 1;" C) U9 N' [8 p b9 e. I3 R$ O7 G
flag = 1;
# I$ a) G6 {3 E& }; X. m ns = 1;/ ?( K D) x/ I( V* L& J/ m
sy(1) = y;
% R- u/ z& l* Y; ?8 T# S sx(1) = x; C b" I% H# }. E
while flag& j4 a2 \( l: x# ?7 k" h
nns = 0;
! }2 H. ]6 ?0 T8 |8 ] nsy = [];: ?6 p5 G+ D- G7 |
nsx = [];
* h' E6 `6 h/ @* P/ ?8 y6 D % 向周围扩散
. U0 C. q6 A+ x/ F) L8 ?7 [ for i = 1:ns
" T, L6 g% T$ s+ L6 P, {) R/ y J(sy(i), sx(i)) = 0;1 E) H$ z0 U; m0 t. [
% top& a3 q; w0 Y! g) L. g, S
if sy(i) > 1 && J(sy(i)-1, sx(i))==1' [/ @0 Z; N: U M
nns = nns + 1;5 M7 }+ J/ F' R! t
nsy(nns) = sy(i) - 1;
& z! Y/ ~5 @( S; J" u) O nsx(nns) = sx(i);
2 j9 K# ^9 m$ D6 C, j( m' k N end a2 ~6 U' |, h) v# u
% down
; w, _5 {. {5 o& n5 L6 }; a if sy(i) < rows && J(sy(i)+1, sx(i))==1: Q) k+ W) a1 f \
nns = nns + 1;1 ]$ v: f$ _( t
nsy(nns) = sy(i) + 1;
2 S' {$ q0 u l$ t3 X7 T nsx(nns) = sx(i);
3 S8 o+ A1 O( x" I3 f6 {/ s end- r5 o3 c" I. e8 L4 w- }4 E! ^9 L
% left; V V, d: P1 P8 i7 O
if sx(i) > 1 && J(sy(i), sx(i)-1)==1 G# d S: r! {& `0 b! g
nns = nns + 1;! c" _+ P" q8 j" ^ T! I
nsy(nns) = sy(i);
8 N6 r! r, D0 i: s nsx(nns) = sx(i) - 1;
" H, P, k5 k4 ~8 S8 G/ q: D end7 n" _* r6 ]- P# z
% right
' t5 z4 C/ F" q) E0 E if sx(i) < columns && J(sy(i), sx(i)+1)==1* B# V+ h% \$ C- j. }" o, ?5 p+ Z
nns = nns + 1;# d6 j, @5 E( D3 W; ]8 a% b; q2 |
nsy(nns) = sy(i);
7 v& h& ~# J M$ O4 H9 Y& y: ~ nsx(nns) = sx(i) + 1;; s5 A' Y. s8 k/ q3 i P$ `
end/ H; x4 o( X9 s# n
end
. }1 g0 y* _ h$ G, r
6 Q% r; i1 H* o5 J ns = nns;! }$ G, T' K! m$ s+ V
sy = nsy;! X+ C0 @ b5 _4 j/ }2 [: J8 r
sx = nsx;
) Z" D* _+ J; c0 C7 ]
8 i( d) p& Y; k& W if ns == 0
9 C) A4 I. I7 h$ U2 O flag = 0;( l. E7 @+ L# z: e
end
$ u. a4 E# E2 Z0 v+ O/ r% O" D6 o" y7 Q* [' x2 ] a7 ]( K5 @
end8 m% a0 t! Z8 i) U& g" k
4 O; A5 r" W/ j6 S" X$ {1 M p
[y, x] = find(J==1, 1);
* j# r3 m- b- L5 J+ q/ C+ D% Yend
( o+ a4 Y' z& D7 k% x* G2 x9 ` Z; A! K% v
disp(count);2 m% n/ ^$ k E) l3 s# Q, {- \6 S
' d7 [" f* ~" m, h
5 G3 D( h& K$ }+ g( h. _
2 i+ j c8 j- j3 y试一下行不行啊8 Q7 e! m6 D1 Z! ~$ m4 n
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