buy and sell stock gfg
#include <iostream>
using namespace std;
class Solution {
public:
int maxProfit(vector<int>& prices) {
if(prices.size()==0 || prices.size()==1) return 0;
int minimumvalue=prices[0];
int maxprofit=0;
int n=prices.size();
for(int i=0;i<n;i++)
{
if(prices[i]>minimumvalue)
{
maxprofit=max(maxprofit,prices[i]-minimumvalue);
}
else if(prices[i]<=minimumvalue)
{
minimumvalue=prices[i];
}
}
return maxprofit;
}
};