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            "title": "Number of Days Between Two Dates",
            "titleSlug": "number-of-days-between-two-dates",
            "content": "<p>Write a program to count the number of days between two dates.</p>\n\n<p>The two dates are given as strings, their format is <code>YYYY-MM-DD</code>&nbsp;as shown in the examples.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n<pre><strong>Input:</strong> date1 = \"2019-06-29\", date2 = \"2019-06-30\"\n<strong>Output:</strong> 1\n</pre><p><strong>Example 2:</strong></p>\n<pre><strong>Input:</strong> date1 = \"2020-01-15\", date2 = \"2019-12-31\"\n<strong>Output:</strong> 15\n</pre>\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li>The given dates are valid&nbsp;dates between the years <code>1971</code> and <code>2100</code>.</li>\n</ul>\n",
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            "difficulty": "Easy",
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            "exampleTestcases": "\"2019-06-29\"\n\"2019-06-30\"\n\"2020-01-15\"\n\"2019-12-31\"",
            "categoryTitle": "Algorithms",
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                {
                    "lang": "C++",
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                    "code": "class Solution {\npublic:\n    int daysBetweenDates(string date1, string date2) {\n        \n    }\n};",
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                    "lang": "Java",
                    "langSlug": "java",
                    "code": "class Solution {\n    public int daysBetweenDates(String date1, String date2) {\n        \n    }\n}",
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                    "lang": "Python",
                    "langSlug": "python",
                    "code": "class Solution(object):\n    def daysBetweenDates(self, date1, date2):\n        \"\"\"\n        :type date1: str\n        :type date2: str\n        :rtype: int\n        \"\"\"\n        ",
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                    "lang": "Python3",
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                    "code": "class Solution:\n    def daysBetweenDates(self, date1: str, date2: str) -> int:\n        ",
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                    "lang": "C",
                    "langSlug": "c",
                    "code": "\n\nint daysBetweenDates(char * date1, char * date2){\n\n}",
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                {
                    "lang": "C#",
                    "langSlug": "csharp",
                    "code": "public class Solution {\n    public int DaysBetweenDates(string date1, string date2) {\n        \n    }\n}",
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                {
                    "lang": "JavaScript",
                    "langSlug": "javascript",
                    "code": "/**\n * @param {string} date1\n * @param {string} date2\n * @return {number}\n */\nvar daysBetweenDates = function(date1, date2) {\n    \n};",
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                    "lang": "Ruby",
                    "langSlug": "ruby",
                    "code": "# @param {String} date1\n# @param {String} date2\n# @return {Integer}\ndef days_between_dates(date1, date2)\n    \nend",
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                {
                    "lang": "Swift",
                    "langSlug": "swift",
                    "code": "class Solution {\n    func daysBetweenDates(_ date1: String, _ date2: String) -> Int {\n        \n    }\n}",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Go",
                    "langSlug": "golang",
                    "code": "func daysBetweenDates(date1 string, date2 string) int {\n    \n}",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Scala",
                    "langSlug": "scala",
                    "code": "object Solution {\n    def daysBetweenDates(date1: String, date2: String): Int = {\n        \n    }\n}",
                    "__typename": "CodeSnippetNode"
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                    "lang": "Kotlin",
                    "langSlug": "kotlin",
                    "code": "class Solution {\n    fun daysBetweenDates(date1: String, date2: String): Int {\n        \n    }\n}",
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                {
                    "lang": "Rust",
                    "langSlug": "rust",
                    "code": "impl Solution {\n    pub fn days_between_dates(date1: String, date2: String) -> i32 {\n        \n    }\n}",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "PHP",
                    "langSlug": "php",
                    "code": "class Solution {\n\n    /**\n     * @param String $date1\n     * @param String $date2\n     * @return Integer\n     */\n    function daysBetweenDates($date1, $date2) {\n        \n    }\n}",
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                    "lang": "TypeScript",
                    "langSlug": "typescript",
                    "code": "function daysBetweenDates(date1: string, date2: string): number {\n\n};",
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                    "lang": "Racket",
                    "langSlug": "racket",
                    "code": "(define/contract (days-between-dates date1 date2)\n  (-> string? string? exact-integer?)\n\n  )",
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                {
                    "lang": "Erlang",
                    "langSlug": "erlang",
                    "code": "-spec days_between_dates(Date1 :: unicode:unicode_binary(), Date2 :: unicode:unicode_binary()) -> integer().\ndays_between_dates(Date1, Date2) ->\n  .",
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                },
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                    "lang": "Elixir",
                    "langSlug": "elixir",
                    "code": "defmodule Solution do\n  @spec days_between_dates(date1 :: String.t, date2 :: String.t) :: integer\n  def days_between_dates(date1, date2) do\n\n  end\nend",
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            "hints": [
                "Create a function f(date) that counts the number of days from 1900-01-01 to date. How can we calculate the answer ?",
                "The answer is just |f(date1) - f(date2)|.",
                "How to construct f(date) ?",
                "For each year from 1900 to year - 1 sum up 365 or 366 in case of leap years. Then sum up for each month the number of days, consider the case when the current year is leap, finally sum up the days."
            ],
            "solution": null,
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            "sampleTestCase": "\"2019-06-29\"\n\"2019-06-30\"",
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