383. Ransom Note
Given an arbitrary ransom note string and another string containing letters from all the magazines, write a function that will return true if the ransom note can be constructed from the magazines ; otherwise, it will return false.
Each letter in the magazine string can only be used once in your ransom note.
Note:
You may assume that both strings contain only lowercase letters.
canConstruct("a", "b") -> false canConstruct("aa", "ab") -> false canConstruct("aa", "aab") -> true
Seen this question in a real interview before?
题意:
这个题叫绑架信是模仿绑架信的写法
我们信中的内容要从杂志上剪出来,所以确保我们信中的每一个字在杂志上都要有
算法思路:
首先先把信和杂志上的每一个字符的出现次数统计在一个数组中
然后比较信中的字符出现的次数,如果有大于杂志上的返回失败,否则成功
代码:
package easy;
import javax.print.attribute.standard.RequestingUserName;
public class RansomNote {
public boolean canConstruct(String ransomNote, String magazine) {
int[] ran = new int[26];
int[] mag = new int[26];
for(int i=0; i<ransomNote.length(); i++){
ran[ransomNote.charAt(i) - 'a']++;
}
for(int i=0; i<magazine.length(); i++){
mag[magazine.charAt(i) - 'a']++;
}
for(int i=0; i<ran.length; i++){
if(ran[i] > mag[i]){
return false;
}
}
return true;
}
}