【LeetCode热题100（82/100）】单词拆分

题目地址： 链接

思路： dp

/*
 * @lc app=leetcode.cn id=139 lang=typescript
 *
 * [139] 单词拆分
 */

// @lc code=start
function wordBreak(s: string, wordDict: string[]): boolean {
    let n = s.length;
    let ans = false;
    let dp = new Array(n + 1).fill(false);
    dp[0] = true;
    for(let i = 1; i <= n; i ++) {
        for(let word of wordDict) {
            let wordLen = word.length;
            if(i < wordLen) continue;
            if(!dp[i - wordLen]) continue;
            let str = s.slice(i - wordLen, i)
            if(str == word) dp[i] = true;
        }
    }
    return dp[n] ?? false;
};
// @lc code=end