def maxProfit(self, prices: List[int]) -> int:
if not len(prices):
return 0
max_profit = 0
for p in range(len(prices) - 1):
prices[p] = prices[p + 1] - prices[p]
prices[p] = max(0, prices[p])
max_profit = sum(prices[:-1])
return max_profit
? ? ? ? 其实就是把价格数组变成了 :价格变化值数组。
? ? ? ? 即从标量(常量)变成了变化量(差异值),把正的变化量相加。
class Solution:
def maxProfit(self, prices: List[int]) -> int:
max_profit = 0
for i in range(1, len(prices)):
if prices[i] > prices[i - 1]:
max_profit += prices[i] - prices[i - 1]
return max_profit
public int MaxProfit(int[] prices) {
int maxProfit = 0;
for (int i = 1; i < prices.Length; i++) {
if (prices[i] > prices[i - 1]) {
maxProfit += prices[i] - prices[i - 1];
}
}
return maxProfit;
}