{
 "cells": [
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   "cell_type": "markdown",
   "source": [
    "Given an array of **n** positive integers and a positive integer **s** , find\n",
    "the minimal length of a **contiguous** subarray of which the sum ≥ **s**. If\n",
    "there isn't one, return 0 instead.\n",
    "\n",
    "**Example:  **\n",
    "\n",
    "\n",
    "\n",
    "    Input: s = 7, nums = [2,3,1,2,4,3]\n",
    "    Output: 2\n",
    "    Explanation: the subarray [4,3] has the minimal length under the problem constraint.\n",
    "\n",
    "**Follow up:**\n",
    "\n",
    "If you have figured out the _O_ ( _n_ ) solution, try coding another solution\n",
    "of which the time complexity is _O_ ( _n_ log _n_ )."
   ],
   "metadata": {}
  },
  {
   "outputs": [
    {
     "output_type": "execute_result",
     "data": {
      "text/plain": "min_subarray_len (generic function with 1 method)"
     },
     "metadata": {},
     "execution_count": 1
    }
   ],
   "cell_type": "code",
   "source": [
    "# @lc code=start\n",
    "using LeetCode\n",
    "\n",
    "function min_subarray_len(s::Int, nums::Vector{Int})\n",
    "    left = right = 1\n",
    "    res = typemax(Int)\n",
    "    len = length(nums)\n",
    "    Σ = nums[1]\n",
    "    while right <= len\n",
    "        if Σ == s\n",
    "            res = min(res, right - left + 1)\n",
    "            Σ -= nums[left]\n",
    "            left += 1\n",
    "            right += 1\n",
    "            (right <= len) && (Σ += nums[right])\n",
    "        elseif Σ < s\n",
    "            right += 1\n",
    "            (right <= len) && (Σ += nums[right])\n",
    "        else\n",
    "            Σ -= nums[left]\n",
    "            left += 1\n",
    "        end\n",
    "    end\n",
    "    res\n",
    "end\n",
    "# @lc code=end"
   ],
   "metadata": {},
   "execution_count": 1
  },
  {
   "cell_type": "markdown",
   "source": [
    "---\n",
    "\n",
    "*This notebook was generated using [Literate.jl](https://github.com/fredrikekre/Literate.jl).*"
   ],
   "metadata": {}
  }
 ],
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