diff --git a/greedy_algorithms/jumpgame.cpp b/greedy_algorithms/jumpgame.cpp
index 25c6f1c05..60b7edd35 100644
--- a/greedy_algorithms/jumpgame.cpp
+++ b/greedy_algorithms/jumpgame.cpp
@@ -5,9 +5,9 @@ Determine if you are able to reach the last index.*/
 
 #include <vector>
 #include<iostream>
-using namespace std;
+
 bool canJump(vector<int> nums) {
-    int lastPos = nums.size() - 1;
+    auto lastPos = nums.size() - 1;
     for (auto i = nums.size() - 1; i >= 0; i--) {
         if (i + nums[i] >= lastPos) {
             lastPos = i;