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55 lines
806 B
55 lines
806 B
package main |
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import "strings" |
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var m = map[rune]struct{}{} |
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func uniqueChar(s string) bool { |
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for _, r := range s { |
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if _, ok := m[r]; ok { |
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return false |
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} |
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m[r] = struct{}{} |
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} |
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return true |
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} |
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func validBase(base string) bool { |
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return len(base) >= 2 && !strings.ContainsAny(base, "+-") && uniqueChar(base) |
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} |
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func power(nbr int, pwr int) int { |
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if pwr == 0 { |
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return 1 |
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} |
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if pwr == 1 { |
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return nbr |
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} |
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return nbr * power(nbr, pwr-1) |
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} |
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func AtoiBase(s string, base string) int { |
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var result int |
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var i int |
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sign := 1 |
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length := len(s) |
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if !validBase(base) { |
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return 0 |
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} |
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if s[i] == '-' { |
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sign = -1 |
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} |
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if s[i] == '-' || s[i] == '+' { |
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i++ |
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} |
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for i < len(s) { |
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result += strings.Index(base, s[i]) * power(len(base), length-1) |
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i++ |
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length-- |
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} |
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return result * sign |
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} |
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func main() { |
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}
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