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22 lines
605 B
22 lines
605 B
package cap3
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// Ex16 求x，其平方为一个各位数字互不相同的九位数
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func Ex16(callback func(x, x2 int)) {
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Next:
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for x := 10000; x < 32000; x++ {
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numCntMap := map[int]bool{}
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x2 := x * x
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for i := x2; i >= 1; i /= 10 {
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digit := i % 10
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// 当前数字已经出现过，直接跳过，找下一个x，如果没出现过，则做标记后看下一位数字情况
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if _, exists := numCntMap[digit]; exists {
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continue Next
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}
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numCntMap[digit] = true
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}
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callback(x, x2)
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}
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}
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