47 lines
793 B
Go
47 lines
793 B
Go
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package main
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func maximumSwap(num int) int {
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fromInt := func() (int, []int) {
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digits := make([]int, 9)
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i := 0
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for ; num > 0; i++ {
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digits[i] = num % 10
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num /= 10
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}
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return i, digits
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}
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toInt := func(digits []int) int {
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result := 0
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for i := len(digits) - 1; i >= 0; i-- {
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result *= 10
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result += digits[i]
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}
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return result
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}
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length, digits := fromInt()
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for i := length - 1; i > 0; i-- {
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max_index := i - 1
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for j := i - 1; j >= 0; j-- {
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if digits[j] > digits[i] && digits[j] >= digits[max_index] {
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max_index = j
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}
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}
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// found bigger digit that can be swapped
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if digits[max_index] > digits[i] {
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digits[max_index], digits[i] = digits[i], digits[max_index]
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return toInt(digits)
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}
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}
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// no swaps happened
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return toInt(digits)
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}
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