15 min Java Coding Challenge - Reverse Words in a String 

One more Approach : Split the String sentence into String array based on white spaces. Reverse iterate over that String array and keep concatenating another result String with the "i"th String and a space and return the result.

Easier way: use the string tokenizer with space denim and print each token but backwards. if there are more than 1 space between the words u can first replace all multiple spaces with a single space(Object String replace method)

Whaaaaaat 😂 that is so complicated for no reason. You can just create an array split by spaces using the string and then use a for loop to print from highest index to the lowest. Let me know if I’m wrong haha.

very nice channel, im sure many people will join competitive programming by seeing your content

I think using functions in such simple task is not a challenge. I appreciate what u do man.

For all those who think he made things too complicated by not using split: This is about solving the problem without allocating any extra space. Split works on String which you need to create first from char[]. Also it returns an array of Strings. This is about working with the char[] and reversing indexes. So yeah split will work and probably be more readable but does not meet the conditions.

for the 1st example(reverse String) you could also do this: public static String reverseString(String word){ String result = ""; for(int i = word.length() - 1; i >= 0; i--){ result += word.charAt(i);; } return result; }

bro.. this is the longest reverse string logic i ever seen lol

Here this code is too complicated.... here I have Done just like that as Java Does not have reverse() method_____________________--> public class ReverseStringLine { public static void main(String[] args) { String s="the sky is blue"; System.out.println(reverse(s)); } static String reverse(String s){ String result=""; String[] word=s.split(" "); for(int i=0;i

This was my solution. I have been using java for 1 week. public class Solution { public String reverseWords(String s) { String[] stringSplit = s.split(" "); String ans = ""; for (int i = stringSplit.length -1; i >= 0; i--) ans = ans + " " + stringSplit[i]; return ans.trim().replaceAll("\\s+"," "); } }

String phrase = "the sky is blue"; String[] words = phrase.split(" "); Optional result = Arrays.asList(words) .stream() .reduce((w1, w2 ) -> (w2+" ").concat(w1)); System.out.println(result.get());

Clever!

public class shaikaffan{ public static void main(String args[]){ String s1="the sky is blue"; String[] s2=s1.split(" "); for(int i=(s2.length-1);i>=0;i--) { System.out.print(s2[i]+" "); } } }

I think the comment section need to learn their isn’t always one answer to a coding question 😂

You could've used strig tokenizer to extract each word and store in an array and reverse the array and print it.

Came here for 4:39

Beautiful solution

Thank you for sharing this with us. Really helpful tips.

I think We can solve this using split function in Java and use for loop

In Javascript, you just need several seconds to do that : 'blue is sky the'.split(' ').reverse().join(' ');

Asha and Amar are playing SpaceKings a video game. It is a two player game where the second player is the helper. Asha needs your help maximizing her gold while playing her favorite game. Both are facing N aliens. Asha and Amar are both at a single location and the aliens are in lined up in front of them. Asha and Amar take turns shooting the aliens, and she goes first. During her turn, Asha may choose any alien to shoot at (this means Asha may choose to skip a turn). During his turn, Amar always shoots the alien closest to him to help Asha maximize her gold. Asha and Amar can not shoot dead alien. If Asha shoots at an alien, its hit points are reduced by P. If Amar shoots at an alien, its hit points are reduced by Q. If an alien's hit points goes below 1, it is killed. The ith alien starts with Hi hit points. Asha is awarded Gi gold if her shot kills the ith alien, but none if Amar's shot kills it. What is the maximum amount of gold Asha can obtain? Input Each case begins with one line containing three space-separated integers representing P, Q and N. N lines then follow, with the ith line containing two space-separated integers representing Hi and Gi. The aliens are given in the order of their distance from Asha and Amar. In other words, Amar will shoot at the ith alien only if all aliens < i are dead. Output Maximum amount of gold that Asha can get Input 20 60 3 80 100 80 200 120 300 Output 500 Explanation Asha should give up the first alien. During her first two turns she should soften up the third alien bringing it down to 80 hp, allowing her to easily get the last shot on the second and the third aliens Input 50 60 2 40 100 40 90 Output 100 Input 50 60 2 40 100 40 200 Output 200 Input 50 100 2 60 100 60 200 Output 200 Input 50 400 2 60 100 190 200 Output 0 solve it plzz

Hi Yusen, thank you for this great content. I have one question. Do you maybe know - when people are on live coding technical interviews of this type, do they need to solve this kind of problems completely from their head? Or it is allowed to check the answers on the internet? Regards.

String frase = "the sky is blue"; String[] words = frase.split(" "); frase = ""; for(int i = (words.length-1); i > -1; i--){ frase += words[i]+" "; } frase = (frase+"@").replace(" @", ""); System.out.println(frase);

First convert into split and loop start from reverse

Incredible

Coding skills 👏

Just split and store in string array And print it from last index . Not more than 5 min.. But u have done gud.

its fine !!

Why don't you first tokenize the string words then store it in an array and ...then display in the array elements in reverse order with space

the easiest way for beginner without any extra methods package Programming; import java.util.Scanner; public class ReverseWordsInSentence { public static void main(String[] args) { try (Scanner in = new Scanner(System.in)) { System.out.print("Enter a sentence: "); String str = in.nextLine(); int len = str.length(); String word = ""; for (int i = len - 1; i >= 0; i--) { char c = str.charAt(i); if (c != ' ') { word = c + word; } else { System.out.print(word + " "); word = ""; } } System.out.print(word); // Print the last word } } } Please reply what do you think and if you have any better program than this please share

can somebody explain once again why -2?

Hi my solution is : public static String rew(String words) { char[] charTab = words.toCharArray(); String tempWord = ""; words = ""; for(char ch : charTab) { if(ch != ' ') { tempWord=tempWord+String.valueOf(ch); }else { words = tempWord+" "+words; tempWord=""; } } words = tempWord+" "+words; return words; }

split->lifo->profit

Great video!

I think you made this way more complicated than it could've been, the split function wouldve made things way easier

This guy took 10 min to do such a easy programme.

Thanks boy

public String reverseWords(String s) { if(s==null || s.equals("") || s.equals(" ")){return "";} String after = s.trim().replaceAll(" +", " "); String words[] = after.split(" "); String rst = ""; for (int i = words.length - 1; i >= 0 ; i --) { rst += words[i] + " "; } return rst; }

Hai im from the future, which 2021, jk how about my solve public static void main(String[] args) { String a = "andreo friendly timorence manukoa"; String hasil[] = a.split(" "); String c; for (int i = 0; i < hasil.length; i++) { a = hasil[(hasil.length-1)-i]; System.out.print(a + " "); } }

Split the string on white space character and exchange the words in array

where do u work Google?

StringRiffle@Reverse@StringSplit@"the sky is blue" -WL

String csv = "Apple Google Samsung"; List stringList = Arrays.asList(csv.split(" ")); Collections.reverse(stringList); System.out.println(stringList); //this print [Samsung, Google, Apple]

Hiiiiiiii neeed help

this is not a good solution for a simple problem!

Are you joking?? Good for an exercise for learning purposes but this 'challenge' can be completed in two lines of code.

Bro just use Split the String by Spaces. One line of code. You are nuquing this problem.

Bonjour une autre façon de faire et merci pour le tuto public static String reverse(String chaine) { String[] parts = chaine.split(" "); for(int i = 0; i < parts.length / 2; i++) { String temp = parts[i]; parts[i] = parts[parts.length - i - 1]; parts[parts.length - i - 1] = temp; } String chaine2 = String.join(" ", parts); System.out.println(chaine2); return chaine2; }

overcomplicated solution

String line = "the sky is blue"; String reverse = ""; String[] splitLine = line.split(" "); for(String part: splitLine){ reverse = part + reverse; } return reverse;

I thought you did a nice job