import(solutions): Add problem 122 .

1 files changed, 28 insertions, 0 deletions

diff --git a/works/solutions/cpp/122.cpp b/works/solutions/cpp/122.cpp
new file mode 100644
index 0000000..d468a23
--- /dev/null
+++ b/works/solutions/cpp/122.cpp
@@ -0,0 +1,28 @@
+#include <vector>
+
+using std::vector;
+
+class Solution
+{
+public:
+    int maxProfit(vector<int> &prices)
+    {
+        if (prices.size() <= 1)
+            return 0;
+
+        int day_count = prices.size();
+
+        vector<vector<int>> dp(day_count, std::vector<int>(2));
+
+        dp[0][0] = 0;
+        dp[0][1] = -prices[0];
+
+        for (int i = 1; i < day_count; i++)
+        {
+            dp[i][0] = std::max(dp[i - 1][0], dp[i - 1][1] + prices[i]);
+            dp[i][1] = std::max(dp[i - 1][1], dp[i - 1][0] - prices[i]);
+        }
+
+        return dp[day_count - 1][0];
+    }
+};