题目1

题解

var replaceWords = function(dictionary, sentence) {
    const dictionarySet = new Set();
    for (const root of dictionary) {
        dictionarySet.add(root);
    }
    const words = sentence.split(" ");
    for (let i = 0; i < words.length; i++) {
        const word = words[i];
        for (let j = 0; j < word.length; j++) {
            if (dictionarySet.has(word.substring(0, 1 + j))) {
                words[i] = word.substring(0, 1 + j);
                break;
            }
        }
    }
    return words.join(' ');
};