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maximum_profit3.cpp
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maximum_profit3.cpp
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/*
* =====================================================================================
*
* Filename: maximum_profit3.cpp
*
* Description: Best Time to Buy and Sell Stock III.
*
* Version: 1.0
* Created: 09/06/18 06:30:33
* Revision: none
* Compiler: gcc
*
* Author: Zhu Xianfeng (), [email protected]
* Organization:
*
* =====================================================================================
*/
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <algorithm>
#include <vector>
class Solution
{
public:
int maxProfit(const std::vector<int>& prices)
{
if (prices.size() < 2)
{
return 0;
}
std::vector<int> left(prices.size(), 0);
std::vector<int> right(prices.size(), 0);
int min_price = prices[0];
for (size_t i = 1; i < prices.size(); i++)
{
if (prices[i] < min_price)
{
min_price = prices[i];
}
int cur_profit = prices[i] - min_price;
left[i] = std::max(left[i - 1], cur_profit);
}
int max_price = *(prices.rbegin());
for (int i = (prices.size() - 2); i >= 0; i--)
{
if (prices[i] > max_price)
{
max_price = prices[i];
}
int cur_profit = max_price - prices[i];
right[i] = std::max(right[i + 1], cur_profit);
}
int max_profit = 0;
for (size_t i = 0; i < left.size(); i++)
{
int cur_profit = left[i] + right[i];
if (cur_profit > max_profit)
{
max_profit = cur_profit;
}
}
return max_profit;
}
};
int main(int argc, char* argv[])
{
std::vector<int> nums = {3, 3, 5, 0, 0, 3, 1, 4};
if (argc > 3)
{
nums.clear();
for (int i = 1; i < argc; i++)
{
nums.push_back(atoi(argv[i]));
}
}
for (auto n: nums)
{
printf("%d ", n);
}
printf("\n");
int max = Solution().maxProfit(nums);
printf("%d\n", max);
return 0;
}