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2288. Apply Discount to Prices

Description

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 numbers without leading zeros.
• All prices will have at most 10 digits.
• 0 <= discount <= 100

Solutions

• Java
• C++
• Python
• Go
• TypeScript

• class Solution {
      public String discountPrices(String sentence, int discount) {
          String[] words = sentence.split(" ");
          for (int i = 0; i < words.length; ++i) {
              if (check(words[i])) {
                  double t = Long.parseLong(words[i].substring(1)) * (1 - discount / 100.0);
                  words[i] = String.format("$%.2f", t);
              }
          }
          return String.join(" ", words);
      }
  
      private boolean check(String s) {
          if (s.charAt(0) != '$' || s.length() == 1) {
              return false;
          }
          for (int i = 1; i < s.length(); ++i) {
              if (!Character.isDigit(s.charAt(i))) {
                  return false;
              }
          }
          return true;
      }
  }
  

• class Solution {
  public:
      string discountPrices(string sentence, int discount) {
          istringstream is(sentence);
          string w;
          string ans;
          auto check = [](string s) {
              if (s[0] != '$' || s.size() == 1) {
                  return false;
              }
              for (int i = 1; i < s.size(); ++i) {
                  if (!isdigit(s[i])) {
                      return false;
                  }
              }
              return true;
          };
          while (is >> w) {
              if (check(w)) {
                  long long v = stoll(w.substr(1)) * (100 - discount);
                  char t[20];
                  sprintf(t, "$%lld.%02lld", v / 100, v % 100);
                  ans += t;
              } else {
                  ans += w;
              }
              ans += ' ';
          }
          ans.pop_back();
          return ans;
      }
  };
  

• class Solution:
      def discountPrices(self, sentence: str, discount: int) -> str:
          ans = []
          for w in sentence.split():
              if w[0] == '$' and w[1:].isdigit():
                  w = f'${int(w[1:]) * (1 - discount / 100):.2f}'
              ans.append(w)
          return ' '.join(ans)
  
  

• func discountPrices(sentence string, discount int) string {
  	words := strings.Split(sentence, " ")
  	for i, w := range words {
  		if w[0] == '$' {
  			if v, err := strconv.Atoi(w[1:]); err == nil {
  				words[i] = fmt.Sprintf("$%.2f", float64(v*(100-discount))/100)
  			}
  		}
  	}
  	return strings.Join(words, " ")
  }
  

• function discountPrices(sentence: string, discount: number): string {
      const sell = (100 - discount) / 100;
      let reg = new RegExp(/^(\$)(([1-9]\d*\.?\d*)|(0\.\d*))$/g);
      let arr = sentence.split(' ').map(d => {
          if (!reg.test(d)) return d;
          return d.replace(reg, (s, $1, $2) => {
              return `$${(sell * $2).toFixed(2)}`;
          });
      });
      return arr.join(' ');
  }
  
  

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