// C++ program to find the difference b/w left and
// right smaller element of every element in array
#include<bits/stdc++.h>
using namespace std;
// Shows function to fill left smaller element for every
// element of Array[0..n1-1]. These values are filled
// in SE1[0..n1-1]
void leftSmaller(int Array[], int n1, int SE1[]){
// Build an empty stack
stack<int>S1;
// Visit all array elements
// Calculate nearest smaller elements of every element
for (int i=0; i<n1; i++){
// Used to keep removing top element from S1 while the top
// element is greater than or equal to Array[i]
while (!S1.empty() && S1.top() >= Array[i])
S1.pop();
// Used to store the smaller element of current element
if (!S1.empty())
SE1[i] = S1.top();
// It has been seen that if all elements in S were greater than Array[i]
else
SE1[i] = 0;
// Used to push this element
S1.push(Array[i]);
}
}
// Shows function returns maximum difference b/w Left &
// right smaller element
int findMaxDiff(int Array[], int n1){
int LS1[n1]; // To store left smaller elements
// find left smaller element of every element
leftSmaller(Array, n1, LS1);
// Determine right smaller element of every element
// first reverse the array and do the same process
int RRS1[n1]; // Used to store right smaller elements in
// reverse array
reverse(Array, Array + n1);
leftSmaller(Array, n1, RRS1);
// Determine maximum absolute difference b/w LS1 & RRS1
// In the reversed array right smaller for Array[i] is
// stored at RRS1[n1-i-1]
int result1 = -1;
for (int i=0 ; i< n1 ; i++)
result1 = max(result1, abs(LS1[i] - RRS1[n1-1-i]));
// return maximum difference between LS1 & RRS1
return result1;
}
// Driver program
int main(){
int Array[] = {3, 5, 9, 8, 8, 10, 4};
int n = sizeof(Array)/sizeof(Array[0]);
cout << "Maximum diff : "
<< findMaxDiff(Array, n) << endl;
return 0;
}
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