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Add Largest Rectangle Problem (fixes #2916) (#2971)

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rameez471 2022-03-15 02:49:42 +05:30 committed by GitHub
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src/main/java/com/thealgorithms/datastructures/stacks/LargestRectangle.java Normal file
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package com.thealgorithms.datastructures.stacks;
import java.util.Stack;
/**
*
* @author mohd rameez github.com/rameez471
*/
public class LargestRectangle {
public static String largestRectanglehistogram(int[] heights) {
int n = heights.length, maxArea = 0;
Stack<int[]> st = new Stack<>();
for(int i=0;i<n;i++) {
int start = i;
while(!st.isEmpty() && st.peek()[1] > heights[i]) {
int[] tmp = st.pop();
maxArea = Math.max(maxArea, tmp[1]*(i - tmp[0]));
start = tmp[0];
}
st.push(new int[]{start, heights[i]});
}
while(!st.isEmpty()) {
int[] tmp = st.pop();
maxArea = Math.max(maxArea, tmp[1]*(n-tmp[0]));
}
return Integer.toString(maxArea);
}
public static void main(String[] args) {
assert largestRectanglehistogram(new int[]{2, 1, 5, 6, 2, 3}).equals("10");
assert largestRectanglehistogram(new int[]{2, 4}).equals("4");
}
}