feat(C++): Add 2208

euchangxian · Oct 14, 2024 · c6d59f9 · c6d59f9
1 parent d27ae88
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diff --git a/C++/2208-MinimumOperationsToHalveArraySum/Solution.cpp b/C++/2208-MinimumOperationsToHalveArraySum/Solution.cpp
@@ -0,0 +1,36 @@
+#include <algorithm>
+#include <cstddef>
+#include <vector>
+
+using namespace std;
+class Solution {
+ public:
+  int halveArray(vector<int>& nums) {
+    const size_t n = nums.size();
+
+    double sum = 0;
+    vector<double> dblNums(n);
+    for (size_t i = 0; i < n; ++i) {
+      dblNums[i] = static_cast<double>(nums[i]);
+      sum += dblNums[i];
+    }
+    // Avoid casting. Ceiling Division.
+    double target = sum / 2;
+
+    std::make_heap(dblNums.begin(), dblNums.end());
+
+    int operations = 0;
+    // Greedily pick the largest num and halve it.
+    while (target > 0) {
+      const double halved = dblNums.front() / 2;
+      std::pop_heap(dblNums.begin(), dblNums.end());
+
+      target -= halved;
+
+      dblNums.back() = halved;
+      std::push_heap(dblNums.begin(), dblNums.end());
+      ++operations;
+    }
+    return operations;
+  }
+};
diff --git a/README.md b/README.md
@@ -374,6 +374,7 @@ Now solving in C++. Like it.
 | 2181 | MergeNodesInBetweenZeros                                         |                                               [![C++](assets/c++.svg)](C++/2181-MergeNodesInBetweenZeros/Solution.cpp)                                                |
 | 2191 | SortTheJumbledNumbers                                            |                                                 [![C++](assets/c++.svg)](C++/2191-SortTheJumbledNumbers/Solution.cpp)                                                 |
 | 2196 | CreateBinaryTreeFromDescriptions                                 |                                           [![C++](assets/c++.svg)](C++/2196-CreateBinaryTreeFromDescriptions/Solution.cpp)                                            |
+| 2208 | MinimumOperationsToHalveArraySum                                 |                                           [![C++](assets/c++.svg)](C++/2208-MinimumOperationsToHalveArraySum/Solution.cpp)                                            |
 | 2220 | MinimumBitFlipsToConvertNumber                                   |                                            [![C++](assets/c++.svg)](C++/2220-MinimumBitFlipsToConvertNumber/Solution.cpp)                                             |
 | 2246 | LongestPathWithDifferentAdjacentCharacters                       |                                      [![C++](assets/c++.svg)](C++/2246-LongestPathWithDifferentAdjacentCharacters/Solution.cpp)                                       |
 | 2275 | LargestCombinationWithBitwiseANDGreaterThanZero                  |                                    [![C++](assets/c++.svg)](C++/2275-LargestCombinationWithBitwiseANDGreaterThanZero/Solution.cpp)                                    |