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boilerplate.go
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292 lines (261 loc) · 5.09 KB
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package main
import (
"bufio"
"fmt"
"io"
"os"
"strconv"
)
// Boilerplate
func Assert(condition bool, items ...interface{}) {
if !condition {
panic("assertion failed: " + fmt.Sprint(items...))
}
}
func Log(items ...interface{}) {
fmt.Println(items...)
}
var Input = bufio.NewReader(os.Stdin)
func ReadByte() byte {
b, e := Input.ReadByte()
if e != nil {
panic(e)
}
return b
}
func MaybeReadByte() (byte, bool) {
b, e := Input.ReadByte()
if e != nil {
if e == io.EOF {
return 0, false
}
panic(e)
}
return b, true
}
func UnreadByte() {
e := Input.UnreadByte()
if e != nil {
panic(e)
}
}
func NewLine() {
for {
b := ReadByte()
switch b {
case ' ', '\t', '\r':
// keep looking
case '\n':
return
default:
panic(fmt.Sprintf("expecting newline, but found character <%c>", b))
}
}
}
func ScanInt(low, high int) int {
return int(ScanInt64(int64(low), int64(high)))
}
func ScanUint(low, high uint) uint {
return uint(ScanUint64(uint64(low), uint64(high)))
}
func ScanInt64(low, high int64) int64 {
Assert(low <= high)
for {
b := ReadByte()
switch b {
case ' ', '\t', '\r':
// keep looking
case '\n':
panic(fmt.Sprintf(
"unexpected newline; expecting range %d..%d", low, high))
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
if high < 0 {
panic(fmt.Sprintf(
"found <%c> but expecting range %d..%d", b, low, high))
}
lw := low
if lw < 0 {
lw = 0
}
UnreadByte()
x, e := _scanu64(uint64(lw), uint64(high))
if e != "" {
panic(fmt.Sprintf("%s %d..%d", e, low, high))
}
return int64(x)
case '-':
if low > 0 {
panic(fmt.Sprintf(
"found minus sign but expecting range %d..%d", low, high))
}
h := high
if h > 0 {
h = 0
}
x, e := _scanu64(uint64(-h), uint64(-low))
if e != "" {
panic(fmt.Sprintf("-%s %d..%d", e, low, high))
}
return -int64(x)
default:
panic(fmt.Sprintf(
"unexpected character <%c>; expecting range %d..%d", b, low, high))
}
}
}
func ScanUint64(low, high uint64) uint64 {
Assert(low <= high)
for {
b := ReadByte()
switch b {
case ' ', '\t', '\r':
// keep looking
case '\n':
panic(fmt.Sprintf(
"unexpected newline; expecting range %d..%d", low, high))
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
UnreadByte()
x, e := _scanu64(low, high)
if e != "" {
panic(fmt.Sprintf("%s %d..%d", e, low, high))
}
return x
default:
panic(fmt.Sprintf(
"unexpected character <%c>; expecting range %d..%d", b, low, high))
}
}
}
func _scanu64(low, high uint64) (result uint64, err string) {
x := uint64(0)
buildnumber:
for {
b, ok := MaybeReadByte()
if !ok {
break buildnumber
}
switch b {
case ' ', '\t', '\r':
break buildnumber
case '\n':
UnreadByte()
break buildnumber
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
d := uint64(b - '0')
if (high-d)/10 < x {
return x, fmt.Sprintf("%d%c... not in range", x, b)
}
x = x*10 + d
default:
return x, fmt.Sprintf("%d%c found; expecting range", x, b)
}
}
if x < low || x > high {
return x, fmt.Sprintf("%d not in range", x)
}
return x, ""
}
func ScanBytes(short, long int) []byte {
Assert(1 <= short && short <= long)
var b byte
buf := make([]byte, long)
skipws:
for {
b = ReadByte()
switch b {
case ' ', '\t', '\r':
// keep looking
case '\n':
panic(fmt.Sprintf("unexpected newline; expecting string"))
default:
break skipws
}
}
buf[0] = b
length := 1
buildstring:
for {
var ok bool
b, ok = MaybeReadByte()
if !ok {
break buildstring
}
switch b {
case ' ', '\t', '\r':
break buildstring
case '\n':
UnreadByte()
break buildstring
default:
if length >= long {
panic(fmt.Sprintf("string length not in range %d..%d", short, long))
}
buf[length] = b
length++
}
}
if length < short {
panic(fmt.Sprintf("string length not in range %d..%d", short, long))
}
return buf[:length]
}
func ScanString(short, long int) string {
return string(ScanBytes(short, long))
}
// Math
var scanner *bufio.Scanner = bufio.NewScanner(os.Stdin)
func abs(x int) int {
if x < 0 {
return -x
}
return x
}
func max(x, y int) int {
if x > y {
return x
}
return y
}
func min(x, y int) int {
if x < y {
return x
}
return y
}
// IO
func readString() string {
scanner.Scan()
return scanner.Text()
}
func readInt() int {
val, _ := strconv.Atoi(readString())
return val
}
func readInt64() int64 {
v, _ := strconv.ParseInt(readString(), 10, 64)
return v
}
func readIntArray(sz int) []int {
a := make([]int, sz)
for i := 0; i < sz; i++ {
a[i] = readInt()
}
return a
}
func readInt64Array(n int) []int64 {
res := make([]int64, n)
for i := 0; i < n; i++ {
res[i] = readInt64()
}
return res
}
// Sort
type Ints64 []int64
func (a Ints64) Len() int { return len(a) }
func (a Ints64) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a Ints64) Less(i, j int) bool { return a[i] < a[j] }
/* Sort tempalte
func (a ) Len() int { return len(a) }
func (a ) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a ) Less(i, j int) bool { return }
*/