Discussion on Day 7: Arrays Challenge

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7 days ago+ 0 comments

Java 15

import java.io.; import java.math.; import java.security.; import java.text.; import java.util.; import java.util.concurrent.; import java.util.function.; import java.util.regex.; import java.util.stream.*; import static java.util.stream.Collectors.joining; import static java.util.stream.Collectors.toList;

public class Solution { public static void main(String[] args) throws IOException { BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));

    int n = Integer.parseInt(bufferedReader.readLine().trim());

    List<Integer> arr = Stream.of(bufferedReader.readLine().replaceAll("\\s+$", "").split(" "))
        .map(Integer::parseInt)
        .collect(toList());

    bufferedReader.close();

for (int i=arr.size()-1; i >= 0; i--){
    System.out.print(arr.get(i) + " ");

} } }

1 week ago+ 0 comments

javascript solution, only 2 line of code. const I change to let to make the variable mutable

function main() {
    const n = parseInt(readLine().trim(), 10);

    let arr = readLine().replace(/\s+$/g, '').split(' ').map(arrTemp => parseInt(arrTemp, 10));
    arr = arr.reverse();
    console.log(arr.join(' '));
}

1 week ago+ 0 comments

C++ solution I hope this gives you an idea and learn how this one works

#include <bits/stdc++.h>

using namespace std;

string ltrim(const string &);
string rtrim(const string &);
vector<string> split(const string &);



int main()
{
    string n_temp;
    getline(cin, n_temp);

    int n = stoi(ltrim(rtrim(n_temp)));

    string arr_temp_temp;
    getline(cin, arr_temp_temp);

    vector<string> arr_temp = split(rtrim(arr_temp_temp));

    vector<int> arr(n);

    for (int i = 0; i < n; i++) {   //n = size of array
        int arr_item = stoi(arr_temp[i]);   //convert string to int(?)
        arr_temp[i] = arr[n - i - 1];  //swap element
        arr[n - i - 1] = arr_item;  //swap element
    
    }
    for(int i = 0; i < n; i++){
        cout << arr[i] << " ";  //prints the reversed
    }

    return 0;
}

string ltrim(const string &str) {
    string s(str);

    s.erase(
        s.begin(),
        find_if(s.begin(), s.end(), not1(ptr_fun<int, int>(isspace)))
    );

    return s;
}

string rtrim(const string &str) {
    string s(str);

    s.erase(
        find_if(s.rbegin(), s.rend(), not1(ptr_fun<int, int>(isspace))).base(),
        s.end()
    );

    return s;
}

vector<string> split(const string &str) {
    vector<string> tokens;

    string::size_type start = 0;
    string::size_type end = 0;

    while ((end = str.find(" ", start)) != string::npos) {
        tokens.push_back(str.substr(start, end - start));

        start = end + 1;
    }

    tokens.push_back(str.substr(start));

    return tokens;
}

3 weeks ago+ 0 comments

n, arr = input(), input().split()
print(*arr[::-1])

3 weeks ago+ 1 comment

Python 3

Can someone please tell me what's wrong here ?

a = n-1

while (a<-1):

    print (arr[a], sep="")

    a -= 1

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