write a C++ program that outputs each number and its rank in the list from a giv
ID: 3665425 • Letter: W
Question
write a C++ program that outputs each number and its rank in the list from a given list of 20 distinct integers. The rank of a number x in list L is the number of elements larger than x in L.
For example,
Input: 20 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 1
Output: (20 0) (2 18) (3 17) (4 16) (5 15) (6 14) (7 13) (8 12) (9 11) (10 10) (11 9) (12 8) (13 7) (14 6) (15 5) (16 4) (17 3) (18 2) (19 1) (1 19)
/* the order of the pairs in the list in the output is not important */
Your program must implement the following algorithm:
Read input of N=20 integers into array A
Scan array A as index i runs from 0 to N-1
calculate the rank of A[i] by counting all numbers that are larger than A[i]
Output all elements and their ranks in list L (i.e. array A)
In this assignment you are asked to implement list L as a linear linked list such that each node in L contains an element and its rank in array A, and next fields.
Explanation / Answer
#include<bits/stdc++.h>
using namespace std;
struct node{
int data;
int rank;
node* next;
}Head;
int main(){
int N = 20;
int arr[20];
for(int i = 0; i < 20; i++)
cin >> arr[i];
node *list = &Head;
for(int i = 0; i < 20; i++){
int cnt = 0;
for(int j = 0; j < 20; j++){
cnt += (arr[j] > arr[i]);
}
list->next = new node();
list = list->next;
list->data = arr[i];
list->rank = cnt;
list->next = NULL;
}
list = Head.next;
while(list != NULL){
cout << " (" << list->data << " " << list->rank << ") ";
list = list->next;
}
cout << endl;
return 0;
}
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