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package main
import (
"flag"
"fmt"
"os"
"os/exec"
)
var file = flag.String("f", "cards", "cards file")
var seg = []int{}
func build(a *[]int, l int, r int, n int) {
if l == r {
seg[n] = (*a)[l]
return
}
m := (l + r) >> 1
build(a, l, m, n<<1)
build(a, m+1, r, n<<1|1)
seg[n] = seg[n<<1] + seg[n<<1|1]
}
func update(x int, v int, l int, r int, n int) {
if l == r {
seg[n] += v
return
}
m := (l + r) >> 1
if x <= m {
update(x, v, l, m, n<<1)
} else {
update(x, v, m+1, r, n<<1|1)
}
seg[n] = seg[n<<1] + seg[n<<1|1]
}
func query(v int, l int, r int, n int) (int, int) {
if l == r {
return seg[n], n
}
m := (l + r) >> 1
if seg[n<<1] < v {
return query(v, l, m, n<<1)
} else {
return query(v-seg[n<<1], m+1, r, n<<1|1)
}
}
func main() {
flag.Parse()
// https://stackoverflow.com/questions/14094190/function-similar-to-getchar
// disable input buffering
exec.Command("stty", "-F", "/dev/tty", "cbreak", "min", "1").Run()
// do not display entered characters on the screen
exec.Command("stty", "-F", "/dev/tty", "-echo").Run()
// restore the echoing state when exiting
defer exec.Command("stty", "-F", "/dev/tty", "echo").Run()
for {
fmt.Println("hello world")
var b []byte = make([]byte, 1)
os.Stdin.Read(b)
if string(b) == 'y' {
} else if string(b) == 'n' {
} else {
}
}
}
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