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03evenonly.cpp

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#include<iostream>

#include<queue>

using namespace std;

/*

Remove all elements present at even positions

*/

void display(queue<int> &q){

int n = q.size();

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

int x = q.front();

cout<<x<<" ";

q.pop();

q.push(x);

}

cout<<endl;

}

void remove_at_even(queue<int> &q){

int n = q.size();

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

int x = q.front();

q.pop();

if(i%2 != 0) q.push(x);

}

}

int main(){

queue<int> q;

q.push(10);

q.push(20);

q.push(30);

q.push(40);

q.push(50);

q.push(60);

q.push(70);

remove_at_even(q);

display(q);

}