Answer / monica

Well this is not an answer to the question but the solution
given in the example is wrong. Wont the subarray that gives
the max sum be {9,4,3,-6,8,7,6,5} whose sum is 36???

Answer / sowmya

# include<stdio.h>
int main()
{
int i,j,k,sum[30],l,z =0,num = 0,sub,len;
int a[30],index[15][15],temp;
sum[z] = 0;
printf("\n Enter the Max.no. of elements to be
entered in the array :\n");
scanf("%d",&len);
printf("\n Enter the array Values : \n");
for(i=0;i<len;i++)
scanf("%d",&a[i]);
for(i = 0;i <len;i++)
{
k = len/2;
l = i+k;
for(j=i;j<l;j++)
if(j<len)
{
num++;
}
if(num == k)
{
for(j =i;j<l;j++)
{
if(j<len)
sum[z] = sum[z]+a[j];
else printf("\n num <3!");
}
z++;
sum[z] = 0;
}
num = 0;
}
j = 0;
for(i = 0 ;i <z;i++)
{
printf(" sum[%d] = %d\n",i,sum[i]);
index[j][i] = sum[i];
}
for(i = 0;i<z;i++)
{
for(j = i+1;j<z;j++)
if(sum[i] < sum[j])
{
temp = sum[i];
sum[i] = sum[j];
sum[j] = temp;
}
}
j= 0;
for(i = 0;i<z;i++)
if(index[j][i] == sum[0])
sub = i;
printf(" Sub array of max. sum = { ");
for(i = sub;i<sub+k;i++)
printf(" %d ",a[i]);
printf("}");
return 0;

}

Answer / manoj

Another approach

# include<stdio.h>

struct index {
int sum;
int start;
int end;
};

int main()
{
struct index sumidx[30],*tmp;

int i,j,z =0,len;
int a[30];

printf("\n Enter the Number of elements to be entered
in the array :\n");
scanf("%d",&len);

printf("\n Enter the array Values : \n");
for(i=0;i<len;i++)
scanf("%d",&a[i]);

for(i = 0;i <len - 1;i++)
{
sumidx[z].sum = a[i];
sumidx[z].start = i;
sumidx[z].end = i;

for(j=i+1;j<len;j++)
if(sumidx[z].sum < (sumidx[z].sum + a[j]))
{
sumidx[z].sum = sumidx[z].sum + a[j];
sumidx[z].start = i;
sumidx[z].end = j;
}
else
break;

z++;
}

tmp = sumidx;

for(i = 0;i<z;i++)
{
if(sumidx[i].start != sumidx[i].end)
if(tmp->sum < sumidx[i].sum)
tmp = sumidx+i;
}
printf("\n sum = %d start = %d end
%d\n",tmp->sum,tmp->start,tmp->end);

return 0;

}

Answer / vadivelt

Hi All,

I hope the code which i have written ll give the exact
answer

Note: Compiler used is visual Studio 2005

Eg: if the the no of elemet is 12 and the elements are -1,-
2,5,6,-4,7,8,9,-3,10,20,-4 then output(sub array) should
contain the elements 10
and 20.

#include<stdio.h>
#include<conio.h>
int MakeSubArray(int *ptr, int size);

main()
{
int array[100];
int subarray[10], Index, no, j, k;
printf("ENTER NO OF ELEMENTS IN THE MAIN ARRAY \n");
scanf("%d", &no);
printf("\nENTER THE ELEMENTS\n");
for(j = 0; j<no; j++)
{
scanf("%d", &array[j]);
}
Index = MakeSubArray(&array[0],no);
printf("\nSTART POSITION\n%d", &array[Index]);
printf("\n\nSUB ARRAY ELEMENT(S) \n");
for(j = Index, k = 0; (array[j] >= 0) && (j < no);
j++, k++)
{
subarray[k] = array[j];
printf("%d ", subarray[k]);
}
printf("\n\nEND POSITION\n%d", &array[j-1]);
getch();
}

int MakeSubArray(int *ptr, int size)
{
int i, flag = 0, sum = 0, sum1 = 0, index = 0,
index1;
if(ptr != '\0' && size > 0)
{
for(i = 0; i <size; i++)
{
if(ptr[i] >= 0)
{
if(flag == 0)
{
index = i;

}
sum = sum + ptr[i];
flag++;
}
else
{
if(flag > 0 && sum1 < sum)
{

index1 = index;
sum1 = sum;

}
sum = 0;
flag = 0;
}
}
/*If the last element is non zero and it is part of
sub array then this condition is useful*/
if(flag > 0 && sum1 < sum)
{
index1 = index;
}
}
return index1;
}

Answer / kyle

Here's another way...
Btw this way gets the correct answer of {9,4,3,-6,8,7,6,5}
with a sum of 36.

#include <stdio.h>
#include <stdlib.h>

#ifndef NULL
#define NULL 0
#endif

struct index {
int start;
int finish;
int sum;
};

int main()
{
// Init and setup variables
struct index max; // Max values
struct index cur; // Current values
int avg = 0; // Average values
int len = 0; // Array length
int* a = NULL; // The array
int i;

//Get values
printf("Enter the number of variables in the array:");
scanf("%d", &len);

array = malloc(len*sizeof(int));

if( array == NULL )
{
printf("Error: Out of memory");
return 0;
}

for(i=0; i<len; ++i)
{
scanf("%d",&a[i]);
avg += a[i];
}
avg /= len; // Compute average

max.start = max.finish = 0;
max.sum = a[0];

for(i=0; i<len && max.finish != len; ++i)
{
cur.start = cur.finish = i;
cur.sum = a[i];
while( cur.sum > avg && cur.finish < len )
{
if( cur.sum > max.sum )
{
max.start = cur.start;
max.finish = cur.finish;
max.sum = cur.sum;
}
++cur.finish;
if( cur.finish < len )
cur.sum += a[cur.finish];
}
}

printf("\n Max sum = %d, start = %d, finish = %d\n",
max.sum, max.start, max.end);
return 0;
}

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