Create 767-reorganize-string.js

Author: everthis

767-reorganize-string.js

@@ -0,0 +1,44 @@
+/**
+ * @param {string} S
+ * @return {string}
+ */
+function reorganizeString(S) {
+    const map = {}
+    const cArr = S.split('')
+    for(let c of cArr) {
+        let count = (map[c] || 0 ) + 1
+        // impossible to form a solution
+        if(count > (S.length + 1) / 2 ) {
+            return ''
+        }
+        map[c] = count
+    }
+
+    const pq = []
+    for(let c of Object.keys(map)) {
+        pq.push([c, map[c]])
+    }
+    pq.sort((a, b) => b[1] - a[1])
+
+    // build the result
+    let sb = ''
+    while(pq.length > 0) {
+        let first = pq.shift()
+        if (sb.length === 0 || first[0] !== sb.charAt(sb.length - 1)) {
+            sb += first[0]
+            if (--first[1] > 0) {
+                pq.push(first)
+            }
+        } else {
+            let second = pq.shift()
+            sb += second[0]
+            if (--second[1] > 0) {
+                pq.push(second)
+            }
+            pq.push(first)
+        }
+        pq.sort((a, b) => b[1] - a[1])
+    }
+
+    return sb
+}