From 4acdc003196cdeccadeacc1576e78708bd5ba572 Mon Sep 17 00:00:00 2001
From: sakshijha0610 <50143370+sakshijha0610@users.noreply.github.com>
Date: Thu, 1 Oct 2020 11:20:04 +0530
Subject: [PATCH] MaximumSubarray

question 53 Maximum Subarray on arrays
---
 problems/src/array/hard.java | 65 ++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 problems/src/array/hard.java

diff --git a/problems/src/array/hard.java b/problems/src/array/hard.java
new file mode 100644
index 00000000..97b1eda3
--- /dev/null
+++ b/problems/src/array/hard.java
@@ -0,0 +1,65 @@
+class Solution {
+    public int maxSubArray(int[] nums) {
+        
+        int n= nums.length;
+        int i=0,sum=0,max=Integer.MIN_VALUE;
+        int cur,next=-1;
+        
+        i = nextpos(nums,0,n); 
+        cur =i;
+        
+        while(i<n)
+        {
+            //System.out.println(sum+" "+max);
+            sum+=nums[i];
+                        
+            if(sum>max)
+            {
+                max=sum;
+            }
+            
+            if(nums[i]>0 && cur>=next)
+            {
+                next=i;                
+            }
+            
+            if(sum < 0)
+            {
+                sum=0;
+                if(cur<next)
+                {
+                    cur=next;
+                    next=-1;
+                    i=cur;
+                    i--;
+                }
+            }   
+            i++;
+           
+        }
+        
+        int lar = Integer.MIN_VALUE;
+        
+         for(int j=0;j<n;j++)
+            {
+                if(lar<nums[j])
+                {
+                    lar=nums[j];
+                }
+            }
+              
+        return Math.max(max,lar);       
+        
+    }
+    
+    public int nextpos (int arr[], int ind , int n)
+    {
+        for(int i=ind;i<n;i++)
+        {
+            if(arr[i]>0)
+                return i;
+        }
+        
+        return n;
+    }
+}