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Stock span problem.java
Views: 1 | Author: cody
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// Stock span problem

import java.util.*;
import java.io.*;
import java.lang.*;

class gfg
{
    public static void main(String args[])
    {
        Scanner sc = new Scanner(System.in);
        int t = sc.nextInt();
        
        while(t-- > 0)
        {
            int n =sc.nextInt();
            int a[] = new int[n];
            
            int i = 0;
            for(i = 0; i < n; i++)
              a[i] = sc.nextInt();
              
            int[] s = new Solution().calculateSpan(a, n);
            
            for(i = 0; i < n; i++)
            {
                System.out.print(s[i] + " ");
            }
            
            System.out.println();
        }
    }
    
    
    
}
// } Driver Code Ends



class Solution
{
    //Function to calculate the span of stock’s price for all n days.
    public static int[] calculateSpan(int price[], int n)
    {
        // Your code here
        int [] ans = new int[n];
        Stack<Integer> st = new Stack<>();
        for(int i = n-1; i>=0; i--){
            while(st.size()>0 && price[i] > price[st.peek()]){
                int idx = st.pop();
                ans[idx] = idx-i;
            }
            st.push(i);
        }
        while(st.size()>0){
            int idx = st.pop();
            ans[idx] = idx+1;
        }
        
      return ans;
    }
}