String Split and Join | HackerRank

Goal

Replace " "(space) into - (hyphen) in string.

Solution

You can use replace function in string to replace space into hyphen. 

It is very useful function. So, please remember this function!

# String Split and Join

def split_and_join(line):
    # write your code here
    split_line = line.replace(' ', '-')
    
    return split_line

if __name__ == '__main__':
    line = input()
    result = split_and_join(line)
    print(result)

Functions | HackerRank

Goal

Get four arguments and return the greatest of the four integers

Solution

Because you just need to return the greatest integer.

You can compare a and b first, then c and d.

If you find already greateest integer, you can simply return the value.

// Functions

#include <iostream>
#include <cstdio>
using namespace std;

/*
Add `int max_of_four(int a, int b, int c, int d)` here.
*/

int max_of_four(int a, int b, int c, int d){
    
    
    if(a >= b){
        if (a >= c){
            if (a >= d){
                return a;
            }
            else{
                return d;
            }
        }
            
        else{
            
            if( c>=d){
                return c;
            }
            
            else{
                return d;
            }
        }
    }
    
    else{
        
        if (b >= c){
            if (b >= d){
                return b;
            }
            else {
                return d;
            }
        }
        
        else{
            
            if (c >= d){
                return c;
            }
            
            else {
                return d;
            }
            
        }
        
    }
    
    return 0;
}



int main() {
    int a, b, c, d;
    scanf("%d %d %d %d", &a, &b, &c, &d);
    int ans = max_of_four(a, b, c, d);
    printf("%d", ans);
    
    return 0;
}

sWAP cASE | HackerRank

Goal

You are given a string and your task is to swap cases. 

In other words, convert all lowercase letters to uppercase letters and vice versa.

Solution

You can read one character in string and swap cases and return new string.

# sWAP cASE

def swap_case(s):
    
    new_s = ""
    
    for c in s:
        if c.isupper():
            new_s += c.lower()
            
        else:
            new_s += c.upper()
            
    return new_s


if __name__ == '__main__':
    s = input()
    result = swap_case(s)
    print(result)