Update and rename canJump.cpp to jump-game.cpp

Author: kamyu104

C++/canJump.cpp

@@ -0,0 +1,13 @@
+// Time:  O(n)
+// Space: O(1)
+
+class Solution {
+public:
+    bool canJump(vector<int>& nums) {
+        int reachable = 0;
+        for (int i = 0; i <= reachable && i < nums.size(); ++i) {
+            reachable = max(reachable, i + nums[i]);
+        }
+        return reachable >= nums.size() - 1;
+    }
+};