#include #include #include using namespace std; int missnumber(std::vector &nums) { unordered_set s; int size = nums.size(); for(int i=0;i0) { s.insert(nums[i]); } } for(int i=1;i nums = {7,8,9,11,12}; int res = missnumber(nums); std::cout<<"First Missing Positive Number : "<