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Maximum of all Subarrays of size k using set in C++ STL
In this tutorial, we will be discussing a program to get maximum of all subarrays of size k using set in C++ STL.
For this we will be provided with a array of size N and integer K. Our task is to get the maximum element in each K elements, add them up and print it out.
Example
#include <bits/stdc++.h>
using namespace std;
//returning sum of maximum elements
int maxOfSubarrays(int arr[], int n, int k){
set<pair<int, int> > q;
set<pair<int, int> >::reverse_iterator it;
//inserting elements
for (int i = 0; i < k; i++) {
q.insert(pair<int, int>(arr[i], i));
}
int sum = 0;
for (int j = 0; j < n - k + 1; j++) {
it = q.rbegin();
sum += it->first;
q.erase(pair<int, int>(arr[j], j));
q.insert(pair<int, int>(arr[j + k], j + k));
}
return sum;
}
int main(){
int arr[] = { 4, 10, 54, 11, 8, 7, 9 };
int K = 3;
int n = sizeof(arr) / sizeof(arr[0]);
cout << maxOfSubarrays(arr, n, K);
return 0;
}Output
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Updated on: 06-Apr-2020
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