# ---
# title: 556. Next Greater Element III
# id: problem556
# author: Tian Jun
# date: 2020-10-31
# difficulty: Medium
# categories: String
# link: <https://leetcode.com/problems/next-greater-element-iii/description/>
# hidden: true
# ---
# 
# Given a positive integer `n`, find _the smallest integer which has exactly the
# same digits existing in the integer_ `n` _and is greater in value than_ `n`.
# If no such positive integer exists, return `-1`.
# 
# **Note** that the returned integer should fit in **32-bit integer** , if there
# is a valid answer but it does not fit in **32-bit integer** , return `-1`.
# 
# 
# 
# **Example 1:**
# 
#     
#     
#     Input: n = 12
#     Output: 21
#     
# 
# **Example 2:**
# 
#     
#     
#     Input: n = 21
#     Output: -1
#     
# 
# 
# 
# **Constraints:**
# 
#   * `1 <= n <= 231 - 1`
# 
# 
## @lc code=start
using LeetCode

## add your code here:
## @lc code=end
