Create maximum-candies-allocated-to-k-children.cpp

Author: kamyu104

C++/maximum-candies-allocated-to-k-children.cpp

@@ -0,0 +1,25 @@
+// Time:  O(nlogr), r is max(candies)
+// Space: O(1)
+
+// binary search
+class Solution {
+public:
+    int maximumCandies(vector<int>& candies, long long k) {
+        const auto& check = [&candies, &k](const auto& x) {
+            return accumulate(cbegin(candies), cend(candies), 0ll,
+                              [&x](const auto& total, const auto& v) {
+                                  return total + v / x;
+                              }) >= k;
+        };
+        int left = 1, right = *max_element(cbegin(candies), cend(candies));
+        while (left <= right) {
+            const auto& mid = left + (right - left) / 2;
+            if (!check(mid)) {
+                right = mid - 1;
+            } else {
+                left = mid + 1;
+            }
+        }
+        return right;
+    }
+};