Given an array arr[] of N dates in the form of “DD-MM-YYYY”, the task is to sort these dates in ascending order.
Examples:
Input: arr[] = { “25-08-1996”, “03-08-1970”, “09-04-1994” }
Output:
03-08-1970
09-04-1994
25-08-1996Input: arr[] = { “03-08-1970”, “09-04-2020”, “19-04-2019″”}
Output:
03-08-1970
19-04-2019
09-04-2020
Approach:
- Create a Custom comparator function that compares two dates as below:
- First compare the year of the two elements. The element with greater year will come after the other element.
- If the year of both the dates is same then compare the months. The element with a greater month will come after the other element.
- If the month of both the dates is same then compare the dates. The element with greater date will come after the other element.
- Then sort the array using the defined custom comparator. In C++, it is done as:
- Print the modified array.
Below is the implementation of the above approach:
C++
// C++ implementation to sort the// array of dates in the form of// "DD-MM-YYYY" using custom comparator#include <bits/stdc++.h>using namespace std;// Comparator to sort the array of datesint myCompare(string date1, string date2){ string day1 = date1.substr(0, 2); string month1 = date1.substr(3, 2); string year1 = date1.substr(6, 4); string day2 = date2.substr(0, 2); string month2 = date2.substr(3, 2); string year2 = date2.substr(6, 4); // Condition to check the year if (year1 < year2) return 1; if (year1 > year2) return 0; // Condition to check the month if (month1 < month2) return 1; if (month1 > month2) return 0; // Condition to check the day if (day1 < day2) return 1; if (day1 > day2) return 0;}// Function that prints the// dates in ascensding ordervoid printDatesAscending( vector<string> arr){ // Sort the dates using library // sort function with custom Comparator sort(arr.begin(), arr.end(), myCompare); // Loop to print the dates for (int i = 0; i < arr.size(); i++) cout << arr[i] << "\n";}// Driver Codeint main(){ vector<string> arr; arr.push_back("25-08-1996"); arr.push_back("03-08-1970"); arr.push_back("09-04-1994"); arr.push_back("29-08-1996"); arr.push_back("14-02-1972"); printDatesAscending(arr); return 0;} |
Java
// Java implementation to sort the // array of dates in the form of // "DD-MM-YYYY" using custom comparator import java.util.*;import java.lang.*;class GFG{ // Function that prints the // dates in ascensding order static void printDatesAscending(ArrayList<String> arr) { // Sort the dates using library // sort function with custom Comparator Collections.sort(arr,new Comparator<>() { public int compare(String date1, String date2) { String day1 = date1.substring(0, 2); String month1 = date1.substring(3, 5); String year1 = date1.substring(6); String day2 = date2.substring(0, 2); String month2 = date2.substring(3, 5); String year2 = date2.substring(6); // Condition to check the year if (year2.compareTo(year1) > 0) return -1; else if (year2.compareTo(year1) < 0) return 1; // Condition to check the month else if (month2.compareTo(month1) > 0) return -1; else if (month2.compareTo(month1) < 0) return 1; // Condition to check the day else if (day2.compareTo(day1) > 0) return -1; else return 1; } }); // Loop to print the dates for(int i = 0; i < arr.size(); i++) System.out.println(arr.get(i)); } // Driver codepublic static void main(String[] args) { ArrayList<String> arr = new ArrayList<>(); arr.add("25-08-1996"); arr.add("03-08-1970"); arr.add("09-04-1994"); arr.add("29-08-1996"); arr.add("14-02-1972"); printDatesAscending(arr); }}// This code is contributed by offbeat |
Python3
# Python3 implementation to sort the# array of dates in the form of# "DD-MM-YYYY" using custom comparatorfrom functools import cmp_to_key# Comparator to sort the array of datesdef myCompare(date1, date2): day1 = date1[0 : 2] month1 = date1[3 : 3 + 2] year1 = date1[6 : 6 + 4] day2 = date2[0 : 2] month2 = date2[3 : 3 + 2] year2 = date2[6 : 6 + 4] # Condition to check the year if (year1 < year2): return -1 if (year1 > year2): return 1 # Condition to check the month if (month1 < month2): return -1 if (month1 > month2): return 1 # Condition to check the day if (day1 < day2): return -1 if (day1 > day2): return 1# Function that prints the# dates in ascensding orderdef printDatesAscending(arr): # Sort the dates using library # sort function with custom Comparator arr = sorted(arr, key = cmp_to_key( lambda a, b: myCompare(a, b))) # Loop to print the dates for i in range(len(arr)): print(arr[i])# Driver Codearr = []arr.append("25-08-1996")arr.append("03-08-1970")arr.append("09-04-1994")arr.append("29-08-1996")arr.append("14-02-1972")printDatesAscending(arr)# This code is contributed by shubhamsingh10 |
C#
// C# implementation to sort the// array of dates in the form of// "DD-MM-YYYY" using custom comparatorusing System;using System.Collections.Generic;using System.Linq;class GFG{ // Comparator to sort the array of datesstatic int myCompare(string date1, string date2){ string day1 = date1.Substring(0, 2); string month1 = date1.Substring(3, 2); string year1 = date1.Substring(6, 4); string day2 = date2.Substring(0, 2); string month2 = date2.Substring(3, 2); string year2 = date2.Substring(6, 4); // Condition to check the year return string.Compare(year1, year2); // Condition to check the month return string.Compare(month1, month2); // Condition to check the day return string.Compare(day1, day2);}// Function that prints the// dates in ascensding orderstatic void printDatesAscending(List<string> arr){ // Sort the dates using library // sort function with custom Comparator arr.Sort(myCompare); // Loop to print the dates for(int i = 0; i < arr.Count; i++) Console.WriteLine(arr[i]);}// Driver Codestatic public void Main(){ List<string> arr = new List<string>(); arr.Add("25-08-1996"); arr.Add("03-08-1970"); arr.Add("09-04-1994"); arr.Add("29-08-1996"); arr.Add("14-02-1972"); printDatesAscending(arr);}}// This code is contributed by shubhamsingh10 |
Javascript
<script>// Javascript implementation of the above approach// Comparator to sort the array of datesfunction myCompare(date1, date2){ var day1 = date1.substr(0, 2); var month1 = date1.substr(3, 2); var year1 = date1.substr(6, 4); var day2 = date2.substr(0, 2); var month2 = date2.substr(3, 2); var year2 = date2.substr(6, 4); // Condition to check the year if (year1 < year2) return -1; if (year1 > year2) return 1; // Condition to check the month if (month1 < month2) return -1; if (month1 > month2) return 1; // Condition to check the day if (day1 < day2) return -1; if (day1 > day2) return 1;}// Function that prints the// dates in ascensding orderfunction printDatesAscending( arr){ var n = arr.length; // Sort the dates using library // sort function with custom Comparator arr.sort(myCompare); // Loop to print the dates for (var i = 0; i < n; i++) document.write(arr[i] + "<br>");}// Driver Codevar arr = []; arr.push("25-08-1996");arr.push("03-08-1970");arr.push("09-04-1994");arr.push("29-08-1996");arr.push("14-02-1972");printDatesAscending(arr);</script> |
Output:
03-08-1970 14-02-1972 09-04-1994 25-08-1996 29-08-1996
Time Complexity: O(N*logN)
Auxiliary Space: O(1)
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