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Difficulty Level :
Easy
Given an array arr[] and a number k. The task is to delete k elements which are smaller than next element (i.e., we delete arr[i] if arr[i] < arr[i+1]) or become smaller than next because next element is deleted.
Examples: 
Input       : arr[] = { 3, 100, 1 }
              k = 1
Output      : 100, 1
Explanation : arr[0] < arr[1] means 3 is less than
              100, so delete 3

Input       : arr[] = {20, 10, 25, 30, 40}
              k = 2
Output      : 25 30 40
Explanation : First we delete 10 because it follows
              arr[i] < arr[i+1]. Then we delete 20
              because 25 is moved next to it and it
              also starts following the condition.

Input       : arr[] = { 23, 45, 11, 77, 18}
              k = 3
Output      : 77, 18
Explanation : We delete 23, 45 and 11 as they follow  
              the condition arr[i] < arr[i+1]
Approach: Stack is used to solving this problem. First we push arr[0] in stack S and then initialize count as 0, then after traverse a loop from 1 to n and then we check that s.top() < arr[i] if condition is true then we pop the element from stack and increase the count if count == k then we stop the loop and then store the value of stack in another array and then print that array. 
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// C++ program to delete elements from array.#include <bits/stdc++.h>using namespace std; // Function for deleting k elementsvoid deleteElements(int arr[], int n, int k){    // Create a stack and push arr[0]    stack<int> s;    s.push(arr[0]);     int count = 0;         // traversing a loop from i = 1 to n    for (int i=1; i<n; i++) {                 // condition for deleting an element        while (!s.empty() && s.top() < arr[i]                            && count < k) {                                                s.pop();            count++;        }                 s.push(arr[i]);    }         // Putting elements of stack in a vector    // from end to begin.    int m = s.size();    vector<int> v(m); // Size of vector is m    while (!s.empty()) {                 // push element from stack to vector v        v[--m] = s.top();        s.pop();    }         // printing result    for (auto x : v)        cout << x << " ";             cout << endl;} // Driver codeint main(){    int n = 5, k = 2;    int arr[] = {20, 10, 25, 30, 40};    deleteElements(arr, n, k);    return 0;}
import java.util.*; //Java program to delete elements from array.class GFG { // Function for deleting k elements    static void deleteElements(int arr[], int n, int k) {        // Create a stack and push arr[0]        Stack<Integer> s = new Stack<>();        s.push(arr[0]);         int count = 0;         // traversing a loop from i = 1 to n        for (int i = 1; i < n; i++) {             // condition for deleting an element            while (!s.empty() && s.peek() < arr[i]                    && count < k) {                s.pop();                count++;            }             s.push(arr[i]);        }         // Putting elements of stack in a vector        // from end to begin.        int m = s.size();        Integer[] v = new Integer[m]; // Size of vector is m        while (!s.empty()) {             // push element from stack to vector v            v[--m] = s.peek();            s.pop();        }         // printing result        for (Integer x : v) {            System.out.print(x + " ");        };         System.out.println("");    } // Driver code    public static void main(String[] args) {        int n = 5, k = 2;        int arr[] = {20, 10, 25, 30, 40};        deleteElements(arr, n, k);    }}// This code is contributed by PrinciRaj1992
# Function to delete elementsdef deleteElements(arr, n, k):         # create an empty stack st    st = []    st.append(arr[0])         # index to maintain the top    # of the stack    top = 0    count = 0     for i in range(1, n):                 # pop till the present element        # is greater than stack's top        # element        while(len(st) != 0 and count < k                   and st[top] < arr[i]):            st.pop()            count += 1            top -= 1         st.append(arr[i])        top += 1     # print the remaining elements    for i in range(0, len(st)):        print(st[i], " ", end="") # Driver codek = 2arr = [20, 10, 25, 30, 40]deleteElements(arr, len(arr), k) # This code is contributed by himan085.
// C# program to delete elements from array.using System;using System.Collections.Generic; class GFG {     // Function for deleting k elements    static void deleteElements(int []arr, int n, int k)    {        // Create a stack and push arr[0]        Stack<int> s = new Stack<int>();        s.Push(arr[0]);         int count = 0;         // traversing a loop from i = 1 to n        for (int i = 1; i < n; i++)        {             // condition for deleting an element            while (s.Count != 0 && s.Peek() < arr[i]                    && count < k)            {                s.Pop();                count++;            }             s.Push(arr[i]);        }         // Putting elements of stack in a vector        // from end to begin.        int m = s.Count;        int[] v = new int[m]; // Size of vector is m        while (s.Count != 0)        {             // push element from stack to vector v            v[--m] = s.Peek();            s.Pop();        }         // printing result        foreach (int x in v)        {            Console.Write(x + " ");        };         Console.Write("");    }     // Driver code    public static void Main()    {        int n = 5, k = 2;        int []arr = {20, 10, 25, 30, 40};        deleteElements(arr, n, k);    }} // This code is contributed by 29AjayKumar
<script> // Javascript program to delete elements from array. // Function for deleting k elementsfunction deleteElements(arr, n, k){         // Create a stack and push arr[0]    var s = [];    s.push(arr[0]);     var count = 0;         // Traversing a loop from i = 1 to n    for(var i = 1; i < n; i++)    {                 // condition for deleting an element        while (s.length != 0 && s[s.length - 1] < arr[i] &&               count < k)        {                                                s.pop();            count++;        }        s.push(arr[i]);    }         // Putting elements of stack in a vector    // from end to begin.    var m = s.length;    var v = Array(m).fill(0); // Size of vector is m    while (s.length != 0)    {                 // push element from stack to vector v        m--;        v[m] = s[s.length - 1];        s.pop();    }         // printing result    v.forEach(x => {        document.write(x + " ");    });} // Driver codevar n = 5, k = 2;var arr = [ 20, 10, 25, 30, 40 ] deleteElements(arr, n, k); // This code is contributed by itsok </script>
25 30 40 
 
Time Complexity: O(n2)
Auxiliary Space: O(n + m)
himan085
princiraj1992
29AjayKumar
swapnil.kesur
itsok
akshaysingh98088
samim2000
cpp-stack
cpp-vector
STL
Arrays
Stack
Arrays
Stack
STL
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