Golang | Leetcode Golang题解之第306题累加数
题目：https://i-blog.csdnimg.cn/direct/30e5915a66214a0dac8c7223fd1862ff.png
题解：
func stringAdd(x, y string) string {
res := []byte{}
carry, cur := 0, 0
for x != "" || y != "" || carry != 0 {
cur = carry
if x != "" {
cur += int(x - '0')
x = x[:len(x)-1]
}
if y != "" {
cur += int(y - '0')
y = y[:len(y)-1]
}
carry = cur / 10
cur %= 10
res = append(res, byte(cur)+'0')
}
for i, n := 0, len(res); i < n/2; i++ {
res, res = res, res
}
return string(res)
}
func valid(num string, secondStart, secondEnd int) bool {
n := len(num)
firstStart, firstEnd := 0, secondStart-1
for secondEnd <= n-1 {
third := stringAdd(num, num)
thirdStart := secondEnd + 1
thirdEnd := secondEnd + len(third)
if thirdEnd >= n || num != third {
break
}
if thirdEnd == n-1 {
return true
}
firstStart, firstEnd = secondStart, secondEnd
secondStart, secondEnd = thirdStart, thirdEnd
}
return false
}
func isAdditiveNumber(num string) bool {
n := len(num)
for secondStart := 1; secondStart < n-1; secondStart++ {
if num == '0' && secondStart != 1 {
break
}
for secondEnd := secondStart; secondEnd < n-1; secondEnd++ {
if num == '0' && secondStart != secondEnd {
break
}
if valid(num, secondStart, secondEnd) {
return true
}
}
}
return false
}
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