Leetcode day 2 and 3

leetcode/lc7/notes.md

@@ -0,0 +1,13 @@
+INT_MAX, INT_MIN are called integer limit macros or more generally type limit constants.(compile-time constants)
+defined in #include <climits>
+
+Modern Alternative:
+
+#include <limits>
+
+numeric_limits<int>::max();
+numeric_limits<int>::min();
+
+int maxInt = std::numeric_limits<int>::max();
+
+