LeetCode 714: Best Time to Buy and Sell Stock with Transaction Fee Solution
Master LeetCode problem 714 (Best Time to Buy and Sell Stock with Transaction Fee), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
714. Best Time to Buy and Sell Stock with Transaction Fee
Problem Explanation
Explanation
To solve this problem, we can use dynamic programming. We will keep track of two states at each day: 1) the maximum profit we can have if we currently own a stock, and 2) the maximum profit we can have if we currently do not own a stock.
At each day, we update these two states based on the decisions of whether to buy, sell, or do nothing. We consider the transaction fee when buying or selling stocks.
The time complexity of this solution is O(n) where n is the number of days in the prices array. The space complexity is O(1) as we only need constant space to store the two states.
Solution Code
class Solution {
public int maxProfit(int[] prices, int fee) {
int ownStock = -prices[0];
int notOwnStock = 0;
for (int i = 1; i < prices.length; i++) {
int prevOwnStock = ownStock;
int prevNotOwnStock = notOwnStock;
// Decide whether to buy, sell, or do nothing
ownStock = Math.max(prevOwnStock, prevNotOwnStock - prices[i]);
notOwnStock = Math.max(prevNotOwnStock, prevOwnStock + prices[i] - fee);
}
return notOwnStock;
}
}Try It Yourself
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