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Maximum Minimum Window program in java

Posted on December 1, 2021December 1, 2021 By christo No Comments on Maximum Minimum Window program in java

Here is the complete program of Maximum Minimum Window program in java

import java.util.Arrays;
import java.util.Stack;

public class MaximumMinimumWindow {

    public static int[] calculateMaxOfMin(int[] arr, int n) {
        Stack<Integer> s = new Stack<>();
        int left[] = new int[n + 1];
        int right[] = new int[n + 1];
        for (int i = 0; i < n; i++) {
            left[i] = -1;
            right[i] = n;
        }

        for (int i = 0; i < n; i++) {
            while (!s.empty() && arr[s.peek()] >= arr[i]) {
                s.pop();
            }

            if (!s.empty()) {
                left[i] = s.peek();
            }

            s.push(i);
        }

        while (!s.empty()) {
            s.pop();
        }

        for (int i = n - 1; i >= 0; i--) {
            while (!s.empty() && arr[s.peek()] >= arr[i]) {
                s.pop();
            }

            if (!s.empty()) {
                right[i] = s.peek();
            }

            s.push(i);
        }

        int ans[] = new int[n + 1];
        for (int i = 0; i <= n; i++) {
            ans[i] = 0;
        }

        for (int i = 0; i < n; i++) {
            int len = right[i] - left[i] - 1;

            ans[len] = Math.max(ans[len], arr[i]);
        }

        for (int i = n - 1; i >= 1; i--) {
            ans[i] = Math.max(ans[i], ans[i + 1]);
        }

        // Print the result
        for (int i = 1; i <= n; i++) {
            System.out.print(ans[i] + " ");
        }
        return ans;
    }

    public static void main(String args[]) {
        int[] arr = new int[]{10, 20, 30, 50, 10, 70, 30};
        int[] target = new int[]{70, 30, 20, 10, 10, 10, 10};
        int[] res = calculateMaxOfMin(arr, arr.length);
        assert Arrays.equals(target, res);
    }

}
data structure, java Tags:data structure, java

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