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27 lines
1.1 KiB
27 lines
1.1 KiB
package cap3
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// Work1 求 2 + 22 + 222 + 2222 + ...22...22(n个2)的精确值，返回大端序结果，高位在前存放结果
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// 按位直接计算结果，从最低位（结果索引的末尾）开始，
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// 每一位(索引i)的计算结果为2*(i+1)加上进位，该位的数字即为结果%10，进位即为结果/10取整。
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// 如n=10，则最低位(i=9)的计算结果为(9+1)*2 + 0 = 20，该位数字为result[i]=20%10=0，进位carry=20/10=2，
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// 下一位(i=8)计算结果为(8+1)*2 + 2 = 20，该位数字为result[i]=20%10=0，进位carry=20/10=2，
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// 下一位(i=7)计算结果为(7+1)*2 + 2 = 18，该位数字为result[i]=18%10=8，进位carry=18/10=1，
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// 以此类推
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func Work1(n int) []uint8 {
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// 大端序，高位在前存放结果
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result := make([]uint8, n)
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carry := 0
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for i := n - 1; i >= 0; i-- {
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num := (i+1)*2 + carry
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carry = num / 10
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result[i] = uint8(num % 10)
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}
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if carry != 0 {
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result = append(result, 0)
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copy(result[1:], result[0:])
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result[0] = uint8(carry)
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}
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return result
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}
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