290. 单词规律.

lib/290_wordPattern.js

@@ -0,0 +1,40 @@
+// 290. 单词规律. 
+// https://leetcode-cn.com/problems/word-pattern/
+
+/**
+ * @param {string} pattern
+ * @param {string} s
+ * @return {boolean}
+ */
+var wordPattern = function (pattern, s) {
+    const pMap = new Map()
+    for (let i = 0; i < pattern.length; i++) {
+        const c = pattern[i]
+        if (pMap.has(c)) {
+            pMap.get(c).push(i)
+        } else {
+            pMap.set(c, [i])
+        }
+    }
+    const sArray = s.split(' ')
+    if (pattern.length !== sArray.length) {
+        return false
+    }
+    const word = []
+    for (const item of pMap) {
+        if (!word.includes(sArray[item[1][0]])) {
+            word.push(sArray[item[1][0]])
+        } else {
+            return false
+        }
+        for (let i = 1; i < item[1].length; i++) {
+            if (sArray[item[1][0]] !== sArray[item[1][i]]) {
+                return false
+            }
+        }
+    }
+    return true
+};
+
+
+console.log(wordPattern("abba", "dog dd dd dog"))