diff --git a/First Missing Positive leetcode.cpp b/First Missing Positive leetcode.cpp
new file mode 100644
index 0000000..18383b5
--- /dev/null
+++ b/First Missing Positive leetcode.cpp	
@@ -0,0 +1,20 @@
+#include<bits/stdc++.h>
+using namespace std;   
+int firstMissingPositive(vector<int>& nums) {
+    unordered_map<int,int> mp;
+    for(int i=0;i<nums.size();i++)
+        mp[nums[i]]+=1;
+    for(int i=1;;i++){
+        if(mp.find(i)==mp.end())
+            return i;
+	}
+    return INT_MAX;
+}
+int main(void){
+	int n;//size of array
+	cin>>n
+	vector<int> nums(n,0);
+	for(int i=0;i<n;i++) cin>>nums[i];
+	cout<<firstMissingPositive(nums);
+	 
+}