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maxprofit.c
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maxprofit.c
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#include<stdlib.h>
#include<string.h>
#include<stdio.h>
int maxProfit(int* prices, int pricesSize)
{
int currentbuyindex = 0;
int currentsellindex = 1;
int i = 0;
int currentmaxprofit = 0;
int maxprofitbuyindex = 0;
int maxprofitsellindex = 1;
int diff = 0;
while ((currentbuyindex <= (pricesSize - 2)) && currentsellindex <= (pricesSize-1) )
{
diff = prices[currentsellindex] - prices[currentbuyindex];
// printf("%d %d %d %d\n", currentsellindex, currentbuyindex, diff, currentmaxprofit);
if (diff > currentmaxprofit)
{
currentmaxprofit = diff;
maxprofitbuyindex = currentbuyindex;
maxprofitsellindex = currentsellindex;
currentsellindex++;
}
else
{
if (diff <= 0)
{
currentbuyindex = currentsellindex;
currentsellindex = currentbuyindex + 1;
}
else
{
currentsellindex++;
}
}
}
//if ((prices[currentbuyindex+1] - prices[currentbuyindex]) > currentmaxprofit)
// {
// currentmaxprofit = prices[currentbuyindex+1] - prices[currentbuyindex];
// }
return currentmaxprofit;
}
void main()
{
int prices[]={7,6,4,3,1};
printf("%d\n", maxProfit(prices, sizeof(prices)/sizeof(prices[0])));
return;
}