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Maximum Subarray (JAVA)

Find the contiguous subarray within an array (containing at least one number) which has the largest sum.

For example, given the array [−2,1,−3,4,−1,2,1,−5,4],
the contiguous subarray [4,−1,2,1] has the largest sum = 6.

 

 1  public static int maxSubArray(int[] A)  2      { 3             int max=A[0]; 4             for(int i=0;i<A.length;i++) 5             { 6                 int sum=0; 7                 for(int j=i;j<A.length;j++) 8                 { 9                     sum+=A[j];10                     if(sum>max)12                         max=sum;15                 }16             }17                 18          return max;19       }

 

 

O(n):

 public static int maxSubArray(int[] A)      {         int max=A[0];         int sum=0;         for(int i=0;i<A.length;i++)         {             sum+=A[i];             if(sum>max)                 max=sum;                          if(sum<0)             sum=0;         }         return max;     }

 

Maximum Subarray (JAVA)