FindFirstAndLastPositionOfElementInSortedArray.cpp

class Solution {
public:
    vector<int> searchRange(vector<int>& nums, int target) {
        int low = 0, high = nums.size() - 1;
        vector<int> res(2, -1);
        if(nums.size() == 0)
            return res;
        while(low < high) {
            int mid = (low + high) / 2;
            if(nums[mid] < target) 
                low = mid + 1;
            else 
                high = mid;
        }
        if(nums[low] != target) return res;
        else res[0] = low;
        high = nums.size() - 1;
        while(low < high) {
            int mid = (low + high) / 2 + 1;
            if(nums[mid] > target) 
                high = mid - 1;
            else
                low = mid;
        }
        res[1] = high;
        return res;
    }
};