added queue implemenation using stack

Author: mdfaizanahmed786

Queues/Implementation/usingStack.cpp

@@ -0,0 +1,39 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int main() {
+
+  
+// queue implementation using two stacks
+stack<int> st1;
+stack<int> st2;
+
+int i=0;
+  while(i<5){
+    //algo
+    // 1. Push everything from stack1 to stack2
+    // 2. insert x or num to stack 1
+    // 3. Again push every number from stack2 to stack1
+    int x;
+    cin>>x;
+    while(!st1.empty()){
+      st2.push(st1.top());
+      st1.pop();
+    }
+    st1.push(x);
+
+      while(!st2.empty()){
+      st1.push(st2.top());
+      st2.pop();
+    }
+    i++;
+  }
+
+  while(!st1.empty()){
+    cout<<st1.top()<<" ";
+    st1.pop();
+  }
+  
+  
+  
+}