Create 0410-split-array-largest-sum.js

Solved split-array-largest-sum in JS.

Author: aadil42

javascript/0410-split-array-largest-sum.js

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+/**
+ * https://leetcode.com/problems/split-array-largest-sum/
+ * 
+ * Binary Search
+ * Time O(log(s)*n) (s = difference between the least and max possible value) | Space O(1)
+ * @param {number[]} nums
+ * @param {number} k
+ * @return {number}
+ */
+var splitArray = function(nums, k) {
+    
+    let left = Math.max(...nums);
+    let right = nums.reduce((acc, num) => acc + num, 0);
+    let result = right;
+    while(left <= right) {
+        const mid = Math.floor((left+right)/2);
+        if(canSplit(mid)) {
+            result = mid;
+            right = mid - 1;
+        } else {
+            left = mid + 1;
+        }
+    }
+
+    function canSplit(largest) {
+        let splitCount = 0;
+        let currSum = 0;
+
+        for(let i = 0; i < nums.length; i++) {
+            currSum += nums[i];
+            if(currSum > largest) {
+                currSum = nums[i];
+                splitCount++;
+            }
+        }
+
+        return splitCount + 1 <= k;
+    }
+
+    return result;
+};