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 "$0.00".
Constraints:
1 <= sentence.length <= 105sentence consists of lowercase English letters, digits, ' ', and '$'.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#
Solution 1#
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| 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)
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| 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;
}
}
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| 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;
}
};
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| 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, " ")
}
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| 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(' ');
}
|
