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;
+}