Create 1946-largest-number-after-mutating-substring.js

Author: everthis

1946-largest-number-after-mutating-substring.js

@@ -0,0 +1,24 @@
+/**
+ * @param {string} num
+ * @param {number[]} change
+ * @return {string}
+ */
+const maximumNumber = function(num, change) {
+  let res = ''
+  const arr = num.split('')
+  let prev = false, cnt = 0
+  for(let i = 0, n = num.length; i < n; i++) {
+    const cur = +num[i]
+    if(change[cur] > cur) {
+      cnt++
+      prev = true
+      arr[i] = change[cur]
+    }
+    if(change[cur] < cur) {
+      if(cnt <= 0) continue
+      else break
+    }
+  }
+  
+  return arr.join('')
+};