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Add files via upload #136

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20 changes: 20 additions & 0 deletions First Missing Positive leetcode.cpp
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Original file line number Diff line number Diff line change
@@ -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);

}