哦,不!你不小心把一个长篇文章中的空格、标点都删掉了,并且大写也弄成了小写。像句子"I reset the computer. It still didn’t boot!"已经变成了"iresetthecomputeritstilldidntboot"。在处理标点符号和大小写之前,你得先把它断成词语。当然了,你有一本厚厚的词典dictionary,不过,有些词没在词典里。假设文章用sentence表示,设计一个算法,把文章断开,要求未识别的字符最少,返回未识别的字符数。
注意:本题相对原题稍作改动,只需返回未识别的字符数
示例:
输入:
dictionary = ["looked","just","like","her","brother"]
sentence = "jesslookedjustliketimherbrother"
输出: 7
解释: 断句后为"jess looked just like tim her brother",共7个未识别字符。
/**
* @param {string[]} dictionary
* @param {string} sentence
* @return {number}
*/
var respace = function(dictionary, sentence) {
let len = sentence.length;
var dp = new Array(len+1)
dp[0] = 0;
for(let i=1;i<=len;i++){
dp[i]=dp[i-1]+1;
for(const word of dictionary){
if(sentence.slice(i-word.length,i)==word){
dp[i] = Math.min(dp[i],dp[i-word.length])
}
}
}
return dp[len]
};