38 lines
526 B
Go
38 lines
526 B
Go
// Package q13 implements a solution for https://leetcode.com/problems/roman-to-integer/
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package q13
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func lookup(b byte) int {
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switch b {
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case 'I':
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return 1
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case 'V':
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return 5
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case 'X':
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return 10
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case 'L':
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return 50
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case 'C':
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return 100
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case 'D':
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return 500
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case 'M':
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return 1000
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}
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return 0
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}
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func romanToInt(s string) int {
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num := 0
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prev := 0
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for i := range len(s) {
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cur := lookup(s[i])
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num += cur
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if prev < cur {
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num -= prev + prev
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}
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prev = cur
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}
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return num
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}
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var _ = romanToInt
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