cpp: add “300. Longest Increasing Subsequence”

Signed-off-by: Matej Focko <mfocko@redhat.com>

cpp/longest-increasing-subsequence.cpp

@@ -0,0 +1,25 @@
+#include <algorithm>
+#include <vector>
+
+class Solution {
+  public:
+    int lengthOfLIS(const std::vector<int> &nums) {
+        if (nums.empty()) {
+            return 0;
+        }
+
+        std::vector<int> dp(nums.size(), 1);
+        int m = 1;
+
+        for (auto i = 1u; i < nums.size(); ++i) {
+            for (auto j = 0u; j < i; ++j) {
+                if (nums[i] > nums[j]) {
+                    dp[i] = std::max(dp[i], 1 + dp[j]);
+                    m = std::max(m, dp[i]);
+                }
+            }
+        }
+
+        return m;
+    }
+};