Stock Buy Sell to Maximize Profit
The cost of a stock on each day is given in an array, find the max profit that you can make by buying and selling in those days. For example, if the given array is {100, 180, 260, 310, 40, 535, 695}, the maximum profit can earned by buying on day 0, selling on day 3. Again buy on day 4 and sell on day 6. If the given array of prices is sorted in decreasing order, then profit cannot be earned at all.
If we are allowed to buy and sell only once, then we can use following algorithm.Maximum difference between two elements. Here we are allowed to buy and sell multiple times. Following is algorithm for this problem.
1. Find the local minima and store it as starting index. If not exists, return.
2. Find the local maxima. and store it as ending index. If we reach the end, set the end as ending index.
3. Update the solution (Increment count of buy sell pairs)
4. Repeat the above steps if end is not reached.
 C

// Program to find best buying and selling days
#include <stdio.h>
// solution structure
struct
Interval
{
int
buy;
int
sell;
};
// This function finds the buy sell schedule for maximum profit
void
stockBuySell(
int
price[],
int
n)
{
// Prices must be given for at least two days
if
(n == 1)
return
;
int
count = 0;
// count of solution pairs
// solution vector
Interval sol[n/2 + 1];
// Traverse through given price array
int
i = 0;
while
(i < n1)
{
// Find Local Minima. Note that the limit is (n2) as we are
// comparing present element to the next element.
while
((i < n1) && (price[i+1] <= price[i]))
i++;
// If we reached the end, break as no further solution possible
if
(i == n1)
break
;
// Store the index of minima
sol[count].buy = i++;
// Find Local Maxima. Note that the limit is (n1) as we are
// comparing to previous element
while
((i < n) && (price[i] >= price[i1]))
i++;
// Store the index of maxima
sol[count].sell = i1;
// Increment count of buy/sell pairs
count++;
}
// print solution
if
(count == 0)
printf
(
"There is no day when buying the stock will make profitn"
);
else
{
for
(
int
i = 0; i < count; i++)
printf
(
"Buy on day: %dt Sell on day: %dn"
, sol[i].buy, sol[i].sell);
}
return
;
}
// Driver program to test above functions
int
main()
{
// stock prices on consecutive days
int
price[] = {100, 180, 260, 310, 40, 535, 695};
int
n =
sizeof
(price)/
sizeof
(price[0]);
// fucntion call
stockBuySell(price, n);
return
0;
}
Output:
Buy on day : 0 Sell on day: 3 Buy on day : 4 Sell on day: 6
Disclaimer: This does not belong to TechCodeBit, its an article taken from the below
source and credits.
source and credits: http://www.geeksforgeeks.org
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