2259-RemoveDigitFromNumberToMaximizeResult.go

package main

// 2259. Remove Digit From Number to Maximize Result
// You are given a string number representing a positive integer and a character digit.

// Return the resulting string after removing exactly one occurrence of digit from number 
// such that the value of the resulting string in decimal form is maximized. 
// The test cases are generated such that digit occurs at least once in number.

// Example 1:
// Input: number = "123", digit = "3"
// Output: "12"
// Explanation: There is only one '3' in "123". After removing '3', the result is "12".

// Example 2:
// Input: number = "1231", digit = "1"
// Output: "231"
// Explanation: We can remove the first '1' to get "231" or remove the second '1' to get "123".
// Since 231 > 123, we return "231".

// Example 3:
// Input: number = "551", digit = "5"
// Output: "51"
// Explanation: We can remove either the first or second '5' from "551".
// Both result in the string "51".

// Constraints:
//     2 <= number.length <= 100
//     number consists of digits from '1' to '9'.
//     digit is a digit from '1' to '9'.
//     digit occurs at least once in number.

import "fmt"

func removeDigit(number string, digit byte) string {
    res := ""
    for i := 0; i < len(number); i++ {
        if number[i] == digit {
            dummy := number[:i] + number[i+1:]
            if dummy > res { 
                res = dummy
            }
        }
    }
    return res
}

func main() {
    // Example 1:
    // Input: number = "123", digit = "3"
    // Output: "12"
    // Explanation: There is only one '3' in "123". After removing '3', the result is "12".
    fmt.Println(removeDigit("123", '3')) // "12"
    // Example 2:
    // Input: number = "1231", digit = "1"
    // Output: "231"
    // Explanation: We can remove the first '1' to get "231" or remove the second '1' to get "123".
    // Since 231 > 123, we return "231".
    fmt.Println(removeDigit("1231", '1')) // "231"
    // Example 3:
    // Input: number = "551", digit = "5"
    // Output: "51"
    // Explanation: We can remove either the first or second '5' from "551".
    // Both result in the string "51".
    fmt.Println(removeDigit("551", '5')) // "51"
}