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main.go
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main.go
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package main
import "strconv"
import "strings"
import "fmt"
func main() {
fmt.Println(isAdditiveNumber("0112"))
fmt.Println(isAdditiveNumber("01124"))
}
func isAdditiveNumber(num string) bool {
max := func(a, b int) int {
if a < b {
return a
}
return b
}
// i, j is length of n1, n2
// 1 2 3 3 / 2 == 1
for i := 1; i <= len(num)/2; i++ {
// the len of sum is great or equal max(i, j)
// 11 + 1, <= len(11)
for j := 1; max(i, j) <= len(num)-j-i; j++ {
if isValid(i, j, num) {
return true
}
}
}
return false
}
func isValid(i, j int, num string) bool {
// 000, 1 02 3, 101
if num[0] == '0' && i > 1 {
return false
}
if num[i] == '0' && j > 1 {
return false
}
x1, _ := strconv.Atoi(num[0:i])
x2, _ := strconv.Atoi(num[i : i+j])
for start := i + j; start != len(num); {
// 0112
sum := x1 + x2
x1 = x2
x2 = sum
sumStr := strconv.Itoa(sum)
if !strings.HasPrefix(num[start:], sumStr) {
return false
}
start += len(sumStr)
}
return true
}