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				@ -6,13 +6,14 @@ import (
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					"strings"
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				)
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				const alpha = "abcdefghjklmnopqrstuvwxyzABCDEFGHJKLMNOPQRSTUVWXYZ" // 无 'I' 的alpha
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				const alpha = "abcdefghjklmnopqrstuvwxyz" // 无 'I' 的alpha
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				const alphaUpper = "ABCDEFGHJKLMNOPQRSTUVWXYZ"
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				func Point(x, y int) string {
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					if x < 0 || x >= 50 || y < 0 || y >= 50 {
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					if x < 0 || x >= 25 || y < 0 || y >= 25 {
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						return ""
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					}
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					return fmt.Sprintf("%s%d", byteToString(alpha[x]), y+1)
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					return fmt.Sprintf("%s%d", byteToString(alphaUpper[x]), y+1)
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				}
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				func byteToString(b byte) string {
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				@ -20,12 +21,15 @@ func byteToString(b byte) string {
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				}
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				func ParsePoint(pos string) (x, y int) {
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					x = byteToIndex(pos[0])
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					x = byteToIndex(alpha, pos[0])
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					if x == -1 {
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						x = byteToIndex(alphaUpper, pos[0])
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					}
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					y, _ = nmath.Int(pos[1:])
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					y = y - 1
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					return
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				}
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				func byteToIndex(b byte) int {
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					return strings.Index(alpha, string([]byte{b}))
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				func byteToIndex(str string, b byte) int {
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					return strings.Index(str, string([]byte{b}))
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				}
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