Rotate array (#210)

* add rotate array

* impl rotate array

leetcode-cc/RotateArray.hpp

@@ -0,0 +1,49 @@
+#include <deque>
+
+#include "TestHelper.h"
+#include "problem.h"
+#include "solution.h"
+
+using namespace std;
+
+IMPLEMENT_PROBLEM_CLASS(PRotateArray, 189, DIFFI_MEDIUM, TOPIC_ALGORITHMS,
+                        "Rotate Array",
+                        "Given an integer array nums, rotate the array to the "
+                        "right by k steps, where k is non-negative.",
+                        {"Array"});
+
+class SRotateArray : public ISolution {
+ public:
+  size_t problemId() const override { return 189; }
+  string name() const override {
+    return ("Solution for " + string("Rotate Array"));
+  }
+  string location() const override { return __FILE_NAME__; }
+  int test() const override {
+    vector<int> nums = {1, 2, 3, 4, 5, 6, 7};
+    int k = 3;
+    this->rotate(nums, k);
+    if (nums == vector({5, 6, 7, 1, 2, 3, 4})) {
+      return 0;
+    } else {
+      return 1;
+    }
+  };
+  int benchmark() const override { return 0; }
+
+ private:
+  void rotate(vector<int>& nums, int k) const {
+    int n = nums.size();
+    k = k % n;
+    deque<int> v = {};
+
+    while (k) {
+      int e = nums.back();
+      nums.pop_back();
+      v.push_front(e);
+      k--;
+    }
+
+    nums.insert(nums.begin(), v.begin(), v.end());
+  }
+};

runtime-cc/src/registration.cc

@@ -91,6 +91,7 @@
 #include "../leetcode-cc/ReverseNodesinKGroup.hpp"
 #include "../leetcode-cc/ReverseWords.hpp"
 #include "../leetcode-cc/RomanToInteger.hpp"
+#include "../leetcode-cc/RotateArray.hpp"
 #include "../leetcode-cc/SameTree.hpp"
 #include "../leetcode-cc/ScrambleString.hpp"
 #include "../leetcode-cc/SearchInRotaedSortedArray.hpp"
@@ -789,5 +790,10 @@ const int registerAll(std::shared_ptr<Container> handle) {
     return std::make_shared<SBestTimeToBuySellStockIV>();
   });
 
+  handle->registerProblem(
+      []() -> ArcProblem { return std::make_shared<PRotateArray>(); });
+  handle->registerSolution(
+      []() -> ArcSolution { return std::make_shared<SRotateArray>(); });
+
   return 0;
 }