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Author: assassint2017

Shuffle an Array/Shuffle_an_Array.cpp

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+// 附参考链接 
+// https://mp.weixin.qq.com/s/495KRYJwG0HQDiITY0Jqng
+
+// Runtime: 196 ms, faster than 93.27% of C++ online submissions for Shuffle an Array.
+// Memory Usage: 30.1 MB, less than 85.71% of C++ online submissions for Shuffle an Array.
+
+class Solution 
+{
+public:
+    Solution(vector<int>& nums) 
+    {
+        data = nums;
+        size = data.size();
+    }
+    
+    /** Resets the array to its original configuration and return it. */
+    vector<int> reset() 
+    {
+        return data;    
+    }
+    
+    /** Returns a random shuffling of the array. */
+    vector<int> shuffle() 
+    {
+        vector<int> shuffledata(data);
+        
+        for (int i = 0; i < size; ++i)
+        {
+            int pos = randint(i, size - 1);
+            swap(shuffledata[i], shuffledata[pos]);
+        }
+        
+        return shuffledata;
+    }
+private:
+    inline int randint(int min, int max)
+    {
+        return min + rand() % (max - min + 1);
+    }
+private:
+    vector<int> data;
+    int size;
+};
+
+/**
+ * Your Solution object will be instantiated and called as such:
+ * Solution* obj = new Solution(nums);
+ * vector<int> param_1 = obj->reset();
+ * vector<int> param_2 = obj->shuffle();
+ */