Add stock

src/s0122_best_time_to_buy_and_sell_stock_ii.cpp

@@ -0,0 +1,12 @@
+#include "s0122_best_time_to_buy_and_sell_stock_ii.hpp"
+
+int S0122::maxProfit(vector<int>& prices) {
+  int len = prices.size();
+  vector<vector<int>> dp(len, vector<int>{0, 0});
+  dp[0][0] = -prices[0];
+  for (int i{1}; i < len; ++i) {
+    dp[i][0] = max(dp[i - 1][0], dp[i - 1][1] - prices[i]);
+    dp[i][1] = max(dp[i - 1][0] + prices[i], dp[i - 1][1]);
+  }
+  return max(dp[len - 1][1], 0);
+}