initial commit

maxprofit2/src/main.cpp

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+#include <cassert>
+#include <iostream>
+#include "maxprofit2.hpp"
+
+int main() {
+  std::vector<int> prices = {7, 1, 5, 3, 6, 4};
+  int k = maxProfit(prices);
+  std::cout << "k: " << k << std::endl;
+  assert(k == 7);
+  prices = {1, 2, 3, 4, 5};
+  k = maxProfit(prices);
+  std::cout << "k: " << k << std::endl;
+  assert(k == 4);
+  prices = {7, 6, 4, 3, 1};
+  k = maxProfit(prices);
+  std::cout << "k: " << k << std::endl;
+  assert(k == 0);
+  return 0;
+}

maxprofit2/src/maxprofit2.hpp

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+#include <vector>
+
+inline int maxProfit(std::vector<int> &prices) {
+  int profit = 0;
+  for (int i = 1; i < int(prices.size()); i++) {
+    if (prices[i] > prices[i - 1]) {
+      profit += prices[i] - prices[i - 1];
+    }
+  }
+  return profit;
+}