word-break-ii.js

/**
 * @param {string} s
 * @param {string[]} wordDict
 * @return {string[]}
 */

var wordBreak = function (s, wordDict) {

    var dp = Array(s.length);
    var map = {};
    var res = [];

    for (var i = 0; i < wordDict.length; i++) {
        map[wordDict[i]] = true;
    }

    return find(s, map, dp, 0);
};

var find = function (s, map, dp, index) {
    if (dp[index]) return dp[index];

    var str = '';
    var tmp = null;
    var len = s.length;

    dp[index] = [];

    for (var i = index; i < len; i++) {
        str = s.substring(index, i + 1);
        if (!map[str]) continue;
        if (i === len - 1) {
            dp[index].push(str);
            break;
        }
        tmp = find(s, map, dp, i + 1);
        for (var j = 0; j < tmp.length; j++) {
            dp[index].push(str + ' ' + tmp[j]);
        }
    }

    return dp[index];

};