# ---
# title: 1343. Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold
# id: problem1343
# author: Tian Jun
# date: 2020-10-31
# difficulty: Medium
# categories: Array
# link: <https://leetcode.com/problems/number-of-sub-arrays-of-size-k-and-average-greater-than-or-equal-to-threshold/description/>
# hidden: true
# ---
# 
# Given an array of integers `arr` and two integers `k` and `threshold`.
# 
# Return _the number of sub-arrays_ of size `k` and average greater than or
# equal to `threshold`.
# 
# 
# 
# **Example 1:**
# 
#     
#     
#     Input: arr = [2,2,2,2,5,5,5,8], k = 3, threshold = 4
#     Output: 3
#     Explanation: Sub-arrays [2,5,5],[5,5,5] and [5,5,8] have averages 4, 5 and 6 respectively. All other sub-arrays of size 3 have averages less than 4 (the threshold).
#     
# 
# **Example 2:**
# 
#     
#     
#     Input: arr = [1,1,1,1,1], k = 1, threshold = 0
#     Output: 5
#     
# 
# **Example 3:**
# 
#     
#     
#     Input: arr = [11,13,17,23,29,31,7,5,2,3], k = 3, threshold = 5
#     Output: 6
#     Explanation: The first 6 sub-arrays of size 3 have averages greater than 5. Note that averages are not integers.
#     
# 
# **Example 4:**
# 
#     
#     
#     Input: arr = [7,7,7,7,7,7,7], k = 7, threshold = 7
#     Output: 1
#     
# 
# **Example 5:**
# 
#     
#     
#     Input: arr = [4,4,4,4], k = 4, threshold = 1
#     Output: 1
#     
# 
# 
# 
# **Constraints:**
# 
#   * `1 <= arr.length <= 10^5`
#   * `1 <= arr[i] <= 10^4`
#   * `1 <= k <= arr.length`
#   * `0 <= threshold <= 10^4`
# 
# 
## @lc code=start
using LeetCode

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