Create find-the-smallest-divisor-given-a-threshold.cpp

Author: kamyu104

C++/find-the-smallest-divisor-given-a-threshold.cpp

@@ -0,0 +1,27 @@
+// Time:  O(logn)
+// Space: O(1)
+
+class Solution {
+public:
+    int smallestDivisor(vector<int>& nums, int threshold) {
+        int left = 1, right = *max_element(nums.cbegin(), nums.cend());
+        while (left <= right) {
+            const auto& mid = left + (right - left) / 2;
+            if (check(nums, mid, threshold)) {
+                right = mid - 1;
+            } else {
+                left = mid + 1;
+            }
+        }
+        return left;
+    }
+
+private:
+    bool check(const vector<int>& nums, int x, int threshold) {
+        return accumulate(nums.cbegin(), nums.cend(), 0,
+                          [&x](const auto& a, const auto& b) {
+                              return a + (b - 1) / x + 1;
+                          })
+               <= threshold;
+    }
+};