Program to find the largest sum of contiguous integers in
the array. O(n)
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Answer Posted / saurabh
#include<stdio.h>
#include<stdlib.h>
int main()
{
int arr[50];
int i,sum1,sum2,n;
int flag;
//int front1,front2,rear1,rear2;
printf("How many elements do you want to enter: ");
scanf("%d",&n);
for(i=0;i<n;i++)
scanf("%d",&arr[i]);
sum1=arr[0];
sum2=arr[0];
if(arr[0]<0)
flag=1;
else
flag=0;
for(i=1;i<n;i++)
{
if(flag==1)
{
if((arr[i]>0&&arr[i-1]<0)||(arr[i]<0&&arr[i-1]<0&&arr[i]>arr[i-1]))
sum2=0;
if(arr[i]<0&&arr[i-1]<0&&arr[i]<arr[i-1])
{
int temp=arr[i];
arr[i]=arr[i-1];
arr[i-1]=arr[i];
sum2=0;
}
if(arr[i]<0&&arr[i-1]>0&&(arr[i-1]+arr[i])<0)
sum1=arr[i-1];
}
sum2=sum2+arr[i];
if(sum2>sum1)
{
sum1=sum2;
flag=0;
}
if(sum2<0)
{
sum2=0;
sum2=sum2+arr[i];
flag=1;
}
}
//printf("%d",rear);
if(sum1>=sum2)
printf("Largest subarray sum= %d\n",sum1);
else
printf("Largest subarray sum= %d\n",sum2);
return 0;
}
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