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383. 赎金信
给你两个字符串:ransomNote 和 magazine ,判断 ransomNote 能不能由 magazine 里面的字符构成。
如果可以,返回 true ;否则返回 false 。
magazine 中的每个字符只能在 ransomNote 中使用一次。
示例 1:
输入:ransomNote = "a", magazine = "b"
输出:false
示例 2:
输入:ransomNote = "aa", magazine = "ab"
输出:false
示例 3:
输入:ransomNote = "aa", magazine = "aab"
输出:true
提示:
1 <= ransomNote.length, magazine.length <= 105
ransomNote 和 magazine 由小写英文字母组成
- 来源:力扣(LeetCode)
- 链接:https://leetcode.cn/problems/ransom-note
javascript
/**
* @param {string} ransomNote
* @param {string} magazine
* @return {boolean}
*/
var canConstruct = function (ransomNote, magazine) {
if (ransomNote.length > magazine.length) return false
var magazineArr = magazine.split("")
for (var i = 0; i < ransomNote.length; i++) {
var ele = ransomNote[i]
var index = magazineArr.indexOf(ele)
if (index === -1) {
return false
} else {
magazineArr[index] = "-"
}
}
return true
}
console.log(canConstruct("a", "b"))
console.log(canConstruct("aa", "ab"))
console.log(canConstruct("aa", "aab"))