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AlgorithmStudy
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Programmers
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Level3
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HW_43163_2.java
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main
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AlgorithmStudy
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Level3
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HW_43163_2.java
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// 규칙에따라 begin에서 target으로 변환하는 가장 짧은 변환 과정 출력
// 시간 복잡도 : 3 <= 단어의 길이 <=10, 3<= words.length <=50 (중복 단어X) O(V+E)
// 최소 변환 횟수 찾기 : BFS
// 단어 변환 : 간선으로 생각하고, 한글자 차이나는 단어들을 간선으로 연결 후 간선 수 출력
import
java
.
util
.*;
class
HW_43163_2
{
public
int
solution
(
String
begin
,
String
target
,
String
[]
words
) {
Queue
<
String
>
queue
=
new
LinkedList
<>();
boolean
[]
visited
=
new
boolean
[
words
.
length
];
queue
.
add
(
begin
);
int
depth
=
0
;
while
(!
queue
.
isEmpty
()){
for
(
int
i
=
0
;
i
<
queue
.
size
();
i
++){
String
cur
=
queue
.
poll
();
if
(
cur
.
equals
(
target
)){
return
depth
;
}
for
(
int
j
=
0
;
j
<
words
.
length
;
j
++){
// 변환 가능한 단어 찾기
if
(!
visited
[
j
] &&
check
(
cur
,
words
[
j
])){
visited
[
j
] =
true
;
queue
.
add
(
words
[
j
]);
}
}
}
depth
++;
}
return
0
;
// 변환X -> 0
}
private
static
boolean
check
(
String
cur
,
String
word
){
// 한글자만 다른지 체크하는 함수
int
cnt
=
0
;
// 다른 글자 수
for
(
int
i
=
0
;
i
<
cur
.
length
();
i
++){
if
(
cur
.
charAt
(
i
) !=
word
.
charAt
(
i
)){
cnt
++;
// 다른 글자 개수 cnt
}
if
(
cnt
>
1
){
return
false
;
}
}
return
true
;
}
}
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