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07reverse_k_elements.cpp

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#include<iostream>

#include<stack>

#include<queue>

using namespace std;

int main(){

queue<int> q;

stack<int> st;

q.push(10);

q.push(20);

q.push(30);

q.push(40);

q.push(50);

int k = 2;

//fill k elements into stack

for(int i=0;i<k;i++){

st.push(q.front());

q.pop();

}

//pop stack to fill element in queue in reverse order

while(st.size()>0){

q.push(st.top());

st.pop();

}

//rotate rest of the elements

for(int i=0;i<q.size()-k;i++){

int x = q.front();

q.pop();

q.push(x);

}

while(q.size()>0){

cout<<q.front()<<" ";

q.pop();

}

}