# Solution: 100 doors

examples/100-doors/100_doors.go
```package main

import "fmt"

func main() {
for i, open := range doors(10) {
fmt.Printf("%3v %v\n", i, open)
}
}

func doors(n int) []bool {
var doors = make([]bool, n)
for i := 1; i <= n; i++ {
d := i
for d <= n {
doors[d-1] = !doors[d-1]
d += i
}
}
return doors
}

```

examples/100-doors/100_doors_test.go
```package main

import (
"fmt"
"testing"
)

func TestDoors(t *testing.T) {
cases := make(map[int][]bool)
cases[0] = []bool{}
cases[1] = []bool{true}
cases[2] = []bool{true, false}
cases[3] = []bool{true, false, false}
cases[4] = []bool{true, false, false, true}
cases[5] = []bool{true, false, false, true, false}
cases[6] = []bool{true, false, false, true, false, false}
cases[7] = []bool{true, false, false, true, false, false, false}
cases[8] = []bool{true, false, false, true, false, false, false, false}
cases[9] = []bool{true, false, false, true, false, false, false, false, true}
cases[10] = []bool{true, false, false, true, false, false, false, false, true, false}
for i, expected := range cases {
actual := doors(i)
if !compare(actual, expected) {
t.Error(fmt.Sprintf("Expected '%v', Actual '%v'", expected, actual))
}
}
}

func compare(a, b []bool) bool {
//fmt.Println(a)
//fmt.Println(b)
if len(a) != len(b) {
return false
}
for i := 0; i < len(a); i++ {
if a[i] != b[i] {
return false
}
}
return true
}

```