Apply Discount to Prices LeetCode Solution

Problem – Apply Discount to Prices LeetCode Solution

A sentence is a string of single-space separated words where each word can contain digits, lowercase letters, and the dollar sign '$'. A word represents a price if it is a sequence of digits preceded by a dollar sign.

• For example, "$100", "$23", and "$6" represent prices while "100", "$", and "$1e5" do not.

You are given a string sentence representing a sentence and an integer discount. For each word representing a price, apply a discount of discount% on the price and update the word in the sentence. All updated prices should be represented with exactly two decimal places.

Return a string representing the modified sentence.

Note that all prices will contain at most 10 digits.

Example 1:

Input: sentence = "there are $1 $2 and 5$ candies in the shop", discount = 50
Output: "there are $0.50 $1.00 and 5$ candies in the shop"
Explanation: 
The words which represent prices are "$1" and "$2". 
- A 50% discount on "$1" yields "$0.50", so "$1" is replaced by "$0.50".
- A 50% discount on "$2" yields "$1". Since we need to have exactly 2 decimal places after a price, we replace "$2" with "$1.00".

Example 2:

Input: sentence = "1 2 $3 4 $5 $6 7 8$ $9 $10$", discount = 100
Output: "1 2 $0.00 4 $0.00 $0.00 7 8$ $0.00 $10$"
Explanation: 
Applying a 100% discount on any price will result in 0.
The words representing prices are "$3", "$5", "$6", and "$9".
Each of them is replaced by "$0.00".

Constraints:

• 1 <= sentence.length <= 105
• sentence consists of lowercase English letters, digits, ' ', and '$'.
• sentence does not have leading or trailing spaces.
• All words in sentence are separated by a single space.
• All prices will be positive integers without leading zeros.
• All prices will have at most 10 digits.
• 0 <= discount <= 100

Apply Discount to Prices LeetCode Solution in Java

class Solution {

    public String discountPrices(String sentence, int discount) {
        String x[] = sentence.split(" ");
        StringBuilder sb = new StringBuilder();
        for (String s : x) {
            if (isPrice(s)) sb.append(calc(Double.parseDouble(s.substring(1)), discount) + " "); 
            else sb.append(s + " ");
        }
        sb.deleteCharAt(sb.length() - 1);
        return sb.toString();
    }

    boolean isPrice(String s) {
        return s.startsWith("$") && s.substring(1).matches("\\d+");
    }

    String calc(double num, double discount) {
        double ans = num - (double) ((double) num * discount / 100.00);
        return "$" + String.format("%.2f", ans);
    }
}

Apply Discount to Prices LeetCode Solution in C++

#define ll long long int
#define ld long double
class Solution {
public:
    string check(string s,int d)
    {
        int c=0;
        for(char ch:s)
        {
            if(isdigit(ch))
            {
                c++;
            }
        }
        string res="";
        if(c!=s.length()||c==0)
        return "-1";
        else
        {
            ll zz=stoll(s);
            
            ll dd=(d)*zz;
            
            ld xx=dd/100.0;
            ld rr=zz-xx;
            res=to_string(rr);
            int x=4;
            while(x--)
            res.pop_back();
        
        }
        return res;
    }
    string discountPrices(string s, int d) {
        s+=' ';
        int n=s.length();
        int left=0;
        string ans="";
        for(int i=0;i<n;i++)
        {
            if(s[i]==' ')
            {
                string str=s.substr(left,i-left);
                bool ok=false;
                if(str[0]=='$')
                {
                    string z=str.substr(1);
                    string a=check(z,d);
                    if(a!="-1")
                    {
                      ans+='$';
                      ans+=a;  
                      ans+=' ';
                        ok=true;
                    }
                    else
                    {
                        ans+=str;
                        ans+=' ';
                    }
                }
                else
                {
                    if(!ok)
                    {
                        ans+=str;
                        ans+=' ';
                    }
                }
                left=i+1;
            }
        }
        ans.pop_back();
        return ans;
    }
};

Apply Discount to Prices LeetCode Solution in Python

class Solution:
    def discountPrices(self, sentence: str, discount: int) -> str:
        s = sentence.split() # convert to List to easily update
        m = discount / 100 
        for i,word in enumerate(s):
            if word[0] == "$" and word[1:].isdigit(): # Check whether it is in correct format
                num = int(word[1:]) * (1-m) # discounted price
                w = "$" + "{:.2f}".format(num) #correctly format
                s[i] = w #Change inside the list
        
        return " ".join(s) #Combine the updated list
		```

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