LeetCode 1271: Hexspeak Solution
Master LeetCode problem 1271 (Hexspeak), a easy challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
Problem Explanation
Explanation:
To solve this problem, we need to convert a given non-negative integer to a string in the hexadecimal representation. The resulting string should only contain the characters 'A', 'B', 'C', 'D', 'E', 'F', and 'I' when written in uppercase. If any other characters are present in the string, we should return "ERROR".
The approach is to convert the given integer to a hexadecimal string using the built-in functions of the respective programming languages. After converting, we iterate through the characters of the hexadecimal string to check if any character other than 'A', 'B', 'C', 'D', 'E', 'F', or 'I' is present. If found, we return "ERROR"; otherwise, we return the uppercase hexadecimal string.
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Solution Code
class Solution {
public String toHexspeak(String num) {
long n = Long.parseLong(num);
String hexString = Long.toHexString(n).toUpperCase();
StringBuilder result = new StringBuilder();
for (char c : hexString.toCharArray()) {
if (c == '0') {
result.append('O');
} else if (c == '1') {
result.append('I');
} else if (c >= '2' && c <= '9') {
result.append('E');
} else {
result.append(c);
}
}
if (result.toString().matches(".*[2-9].*")) {
return "ERROR";
}
return result.toString();
}
}Try It Yourself
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