InterviewBit Problems   First Missing Integer : Solved

About the First Missing Integer : Solved category (1)
Easiest Possible Solution (1)
Best solution - O(n) time and no extra space! no swapping (1)
Easy O(n) space and time solution using STL (2)
Concise Code With comments (1)
Python2.x [EASY] [SETS] (5)
O(NlogN) soln (Only for concept clarity) (1)
My java7 solution (1)
Why my code is showing tle error (1)
Cpp solution - Accepted (1)
Easy solution O(n) time and O(1) space complexity (1)
LOL so easy for 300 (2)
Simple Java Solution With O(n) and O(1) (2)
Different O(n) solution with explaination (2)
First Missing Integer in Java solution (2)
Strange error in my solution, works locally on my laptop but not on ib (1)
Proper O(n) Solution (1)
Why this is giving TLE , I think it is O(n) and O(1) (python 3) (2)
C++ solution passing all cases in O(n) (1)
Short and simple O(n) time O(1) space cpp solution (1)
Very Easy Python Solution uses O(n) time and O(n) space. Think hashmaps! (1)
Java Solution..... priority Queue works here.....though it uses linear space and nlogn time (1)
Quick sort kind of partitioning followed by signed approach [More Intuitive O(n) time, O(1) space] (1)
The elegance of python (1)
Java perfect Solution .. Short and Simple Sol O(n) and O(1) (2)
O(n) time and constant space (2)
Python o(n) easy (1)
Best and very simple C++ solution (Must check) (1)
C++ soln,constant space,O(n) (2)
Solution in c++ using array (1)