97

Author: 邝健豪

javaScript/100/97-isInterleave.js

@@ -0,0 +1,23 @@
+/**
+ * https://leetcode-cn.com/problems/interleaving-string/
+ * 97. 交错字符串
+ * Hard
+ * @param {string} s1
+ * @param {string} s2
+ * @param {string} s3
+ * @return {boolean}
+ */
+var isInterleave = function (s1, s2, s3) {
+    if (s1.length + s2.length !== s3.length) return false
+    const len1 = s1.length
+    const len2 = s2.length
+    const dp = [...new Array(len1 + 1)].map(() => Array(len2 + 1).fill(0))
+    dp[0][0] = 1
+    for (let i = 1; i <= len1 && s1[i - 1] === s3[i - 1]; i++) dp[i][0] = 1
+    for (let i = 1; i <= len2 && s2[i - 1] === s3[i - 1]; i++) dp[0][i] = 1
+    for (let i = 1; i <= len1; i++) {
+        for (let j = 1; j <= len2; j++)
+            dp[i][j] = dp[i - 1][j] && s1[i - 1] === s3[i + j - 1] || dp[i][j - 1] && s2[j - 1] === s3[i + j - 1]
+    }
+    return dp[len1][len2]
+};