Added descriptions 14-16.

src/main/java/g0001_0100/s0014_longest_common_prefix/readme.md

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+14\. Longest Common Prefix
+
+Easy
+
+Write a function to find the longest common prefix string amongst an array of strings.
+
+If there is no common prefix, return an empty string `""`.
+
+**Example 1:**
+
+**Input:** strs = \["flower","flow","flight"\]
+
+**Output:** "fl" 
+
+**Example 2:**
+
+**Input:** strs = \["dog","racecar","car"\]
+
+**Output:** ""
+
+**Explanation:** There is no common prefix among the input strings. 
+
+**Constraints:**
+
+*   `1 <= strs.length <= 200`
+*   `0 <= strs[i].length <= 200`
+*   `strs[i]` consists of only lower-case English letters.

src/main/java/g0001_0100/s0015_three_sum/readme.md

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+15\. 3Sum
+
+Medium
+
+Given an integer array nums, return all the triplets `[nums[i], nums[j], nums[k]]` such that `i != j`, `i != k`, and `j != k`, and `nums[i] + nums[j] + nums[k] == 0`.
+
+Notice that the solution set must not contain duplicate triplets.
+
+**Example 1:**
+
+**Input:** nums = \[-1,0,1,2,-1,-4\]
+
+**Output:** \[\[-1,-1,2\],\[-1,0,1\]\] 
+
+**Example 2:**
+
+**Input:** nums = \[\]
+
+**Output:** \[\] 
+
+**Example 3:**
+
+**Input:** nums = \[0\]
+
+**Output:** \[\] 
+
+**Constraints:**
+
+*   `0 <= nums.length <= 3000`
+*   `-105 <= nums[i] <= 105`

src/main/java/g0001_0100/s0016_three_sum_closest/readme.md

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+16\. 3Sum Closest
+
+Medium
+
+Given an integer array `nums` of length `n` and an integer `target`, find three integers in `nums` such that the sum is closest to `target`.
+
+Return _the sum of the three integers_.
+
+You may assume that each input would have exactly one solution.
+
+**Example 1:**
+
+**Input:** nums = \[-1,2,1,-4\], target = 1
+
+**Output:** 2
+
+**Explanation:** The sum that is closest to the target is 2. (-1 + 2 + 1 = 2). 
+
+**Example 2:**
+
+**Input:** nums = \[0,0,0\], target = 1
+
+**Output:** 0 
+
+**Constraints:**
+
+*   `3 <= nums.length <= 1000`
+*   `-1000 <= nums[i] <= 1000`
+*   `-104 <= target <= 104`