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package main
import "fmt"
func addBinary(a string, b string) string {
var long string
var short string
var count int
carry := false
if len(a) >= len(b) {
long = a
short = b
} else {
long = b
short = a
}
result := make([]byte, len(long)+1)
for i := len(long) - 1; i >= 0; i-- {
if long[i] == '1' {
count++
}
if len(short)-(len(long)-i) >= 0 {
if short[len(short)-(len(long)-i)] == '1' {
count++
}
}
if carry {
count++
}
switch count {
case 0:
result[i+1] = '0'
carry = false
case 1:
result[i+1] = '1'
carry = false
case 2:
result[i+1] = '0'
carry = true
case 3:
result[i+1] = '1'
carry = true
}
count = 0
}
if carry {
result[0] = '1'
}
// fmt.Println(result)
if result[0] == 0 {
return string(result[1:])
} else {
return string(result)
}
}
func main() {
fmt.Println(addBinary("11", "1"))
fmt.Println(addBinary("1010", "1011"))
fmt.Println(addBinary("0111", "0111"))
fmt.Println(addBinary("0", "0"))
fmt.Println(addBinary("10", "0"))
fmt.Println(addBinary("10", "1"))
}
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