Create 1531-string-compression-ii.js

Author: everthis

1531-string-compression-ii.js

@@ -0,0 +1,26 @@
+/**
+ * @param {string} s
+ * @param {number} k
+ * @return {number}
+ */
+const getLengthOfOptimalCompression = function(s, k) {
+  const m = new Map()
+  function counter(start, last, lastCount, left) {
+    if(left < 0) return Infinity
+    if(start >= s.length) return 0
+    let res
+    const k = `${start}-${last}-${lastCount}-${left}`
+    if(m.has(k)) return m.get(k)
+    if(s[start] === last) {
+      const incr = (lastCount === 1 || lastCount === 9 || lastCount === 99) ? 1 : 0
+      res = incr + counter(start + 1, last, lastCount + 1, left)
+    } else {
+      const keepCounter = 1 + counter(start + 1, s[start], 1, left)
+      const delCounter = counter(start + 1, last,  lastCount, left - 1)
+      res = Math.min(keepCounter, delCounter)
+    }
+    m.set(k, res)
+    return res
+  }
+  return counter(0, '', 0, k)
+};