Create 516-longest-palindromic-subsequence.js

Author: everthis

516-longest-palindromic-subsequence.js

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+/**
+ * @param {string} s
+ * @return {number}
+ */
+const longestPalindromeSubseq = function(s) {
+  const len = s.length
+  const dp = Array.from({length: len + 1}, () => new Array(len + 1).fill(0))
+  for(let i = len - 1; i >= 0; i--) {
+    dp[i][i] = 1
+    for(let j = i + 1; j < len; j++) {
+      if(s[i] === s[j]) {
+         dp[i][j] = dp[i+1][j-1] + 2
+      } else {
+        dp[i][j] = Math.max(dp[i][j - 1], dp[i+1][j])
+      }
+    }
+  }
+  return dp[0][s.length - 1]
+};