solves issue tulika-99#222

Patience Sort/PatienceSort.cpp

@@ -0,0 +1,151 @@
+// C++ program of the above approach
+
+#include <bits/stdc++.h>//If VSCode is unable to locate the bits folder,then open the bits folder in your mingw folder on your program files and then add the path to the include folder in your vs code folder
+using namespace std;
+
+// Function to merge piles in a sorted order
+vector<int> merge_piles(vector<vector<int> >& v)
+{
+
+	// Store minimum element from
+	// the top of stack
+	vector<int> ans;
+
+	// In every iteration find the smallest element
+	// of top of pile and remove it from the piles
+	// and store into the final array
+	while (1) {
+
+		// Stores the smallest element
+		// of the top of the piles
+		int minu = INT_MAX;
+
+		// Stores index of the smallest element
+		// of the top of the piles
+		int index = -1;
+
+		// Calculate the smallest element
+		// of the top of the every stack
+		for (int i = 0; i < v.size(); i++) {
+
+			// If minu is greater than
+			// the top of the current stack
+			if (minu > v[i][v[i].size() - 1]) {
+
+				// Update minu
+				minu = v[i][v[i].size() - 1];
+
+				// Update index
+				index = i;
+			}
+		}
+
+		// Insert the smallest element
+		// of the top of the stack
+		ans.push_back(minu);
+
+		// Remove the top element from
+		// the current pile
+		v[index].pop_back();
+
+		// If current pile is empty
+		if (v[index].empty()) {
+
+			// Remove current pile
+			// from all piles
+			v.erase(v.begin() + index);
+		}
+
+		// If all the piles are empty
+		if (v.size() == 0)
+			break;
+	}
+	return ans;
+}
+
+// Function to sort the given array
+// using the patience sorting
+vector<int> patienceSorting(vector<int> arr)
+{
+
+	// Store all the created piles
+	vector<vector<int> > piles;
+
+	// Traverse the array
+	for (int i = 0; i < arr.size(); i++) {
+
+		// If no piles are created
+		if (piles.empty()) {
+
+			// Initialize a new pile
+			vector<int> temp;
+
+			// Insert current element
+			// into the pile
+			temp.push_back(arr[i]);
+
+			// Insert current pile into
+			// all the piles
+			piles.push_back(temp);
+		}
+		else {
+
+			// Check if top element of each pile
+			// is less than or equal to
+			// current element or not
+			int flag = 1;
+
+			// Traverse all the piles
+			for (int j = 0; j < piles.size(); j++) {
+
+				// Check if the element to be
+				// inserted is less than
+				// current pile's top
+				if (arr[i] < piles[j][piles[j].size() - 1]) {
+					piles[j].push_back(arr[i]);
+
+					// Update flag
+					flag = 0;
+					break;
+				}
+			}
+
+			// If flag is true
+			if (flag) {
+
+				// Create a new pile
+				vector<int> temp;
+
+				// Insert current element
+				// into temp
+				temp.push_back(arr[i]);
+
+				// Insert current pile
+				// into all the piles
+				piles.push_back(temp);
+			}
+		}
+	}
+
+	// Store the sorted sequence
+	// of the given array
+	vector<int> ans;
+
+	// Sort the given array
+	ans = merge_piles(piles);
+
+	// Traverse the array, ans[]
+	for (int i = 0; i < ans.size(); i++)
+		cout << ans[i] << " ";
+
+	return ans;
+}
+
+// Driver Code
+int main()
+{
+	vector<int> arr = { 6, 12, 2, 8, 3, 7 };
+
+	// Function Call
+	patienceSorting(arr);
+}