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public class Permutation { | |
boolean permutation(String s, String t) { | |
if (s.length() != t.length()) { | |
return false; | |
} | |
//memo 저장 공간 | |
int[] marking = new int[128]; | |
//첫 번째 문자열을 memo +1 | |
char[] s_array = s.toCharArray(); | |
for (char c : s_array) { | |
marking[c]++; | |
} | |
//이미 memo된 문자 요소와 두 번째 문자 요소 memo -1 | |
for (int i = 0; i < t.length(); i++) { | |
int c = t.charAt(i); | |
marking[c]--; | |
//음수 발생 시, 두 문자열은 같이 않음 | |
if (marking[c] < 0) { | |
return false; | |
} | |
} | |
return true; | |
} | |
public static void main(String[] args) { | |
Permutation p = new Permutation(); | |
System.out.println(p.permutation("abc", "bca")); | |
} | |
} |
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