Language: C

package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func main() {
	sc := NewScanner()
	S, W := sc.NextInt(), sc.NextInt()
	if S <= W {
		fmt.Println("unsafe")
	} else {
		fmt.Println("safe")
	}
}

type Scanner struct {
	r   *bufio.Reader
	buf []byte
	p   int
}

func NewScanner() *Scanner {
	rdr := bufio.NewReaderSize(os.Stdin, 1000)
	return &Scanner{r: rdr}
}
func (s *Scanner) Next() string {
	s.pre()
	start := s.p
	for ; s.p < len(s.buf); s.p++ {
		if s.buf[s.p] == ' ' {
			break
		}
	}
	result := string(s.buf[start:s.p])
	s.p++
	return result
}
func (s *Scanner) NextLine() string {
	s.pre()
	start := s.p
	s.p = len(s.buf)
	return string(s.buf[start:])
}
func (s *Scanner) NextInt() int {
	v, _ := strconv.Atoi(s.Next())
	return v
}
func (s *Scanner) NextInt64() int64 {
	v, _ := strconv.ParseInt(s.Next(), 10, 64)
	return v
}

func (s *Scanner) NextFloat() float64 {
	v, _ := strconv.ParseFloat(s.Next(), 64)
	return v
}

func (s *Scanner) NextIntArray() []int {
	s.pre()
	start := s.p
	result := []int{}
	for ; s.p < len(s.buf)+1; s.p++ {
		if s.p == len(s.buf) || s.buf[s.p] == ' ' {
			v, _ := strconv.ParseInt(string(s.buf[start:s.p]), 10, 0)
			result = append(result, int(v))
			start = s.p + 1
		}
	}

	return result
}
func (s *Scanner) NextInt64Array() []int64 {
	s.pre()
	start := s.p
	result := []int64{}
	for ; s.p < len(s.buf)+1; s.p++ {
		if s.p == len(s.buf) || s.buf[s.p] == ' ' {
			v, _ := strconv.ParseInt(string(s.buf[start:s.p]), 10, 64)
			result = append(result, v)
			start = s.p + 1
		}
	}
	return result
}

func (s *Scanner) NextMap() map[int]bool {
	s.pre()
	start := s.p
	mp := map[int]bool{}
	for ; s.p < len(s.buf); s.p++ {
		if s.buf[s.p] == ' ' {
			v, _ := strconv.Atoi(string(s.buf[start:s.p]))
			mp[v] = true
			start = s.p + 1
		}
	}
	v, _ := strconv.Atoi(string(s.buf[start:s.p]))
	mp[v] = true

	return mp
}

func (s *Scanner) pre() {
	if s.p >= len(s.buf) {
		s.readLine()
		s.p = 0
	}
}
func (s *Scanner) readLine() {
	s.buf = make([]byte, 0)
	for {
		l, p, e := s.r.ReadLine()
		if e != nil {
			panic(e)
		}
		s.buf = append(s.buf, l...)
		if !p {
			break
		}
	}
}


Compiler output:
main.c:1:1: error: unknown type name 'package'
    1 | package main
      | ^~~~~~~
main.c:3:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'import'
    3 | import (
      | ^~~~~~
main.c:20:1: error: unknown type name 'type'; did you mean 'typeof'?
   20 | type Scanner struct {
      | ^~~~
      | typeof
main.c:20:13: error: expected ';' before 'struct'
   20 | type Scanner struct {
      |             ^~~~~~~
      |             ;
main.c:21:9: error: unknown type name 'r'
   21 |         r   *bufio.Reader
      |         ^
main.c:21:19: error: expected ':', ',', ';', '}' or '__attribute__' before '.' token
   21 |         r   *bufio.Reader
      |                   ^
main.c:26:6: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'NewScanner'
   26 | func NewScanner() *Scanner {
      |      ^~~~~~~~~~
main.c:30:7: error: unknown type name 's'
   30 | func (s *Scanner) Next() string {
      |       ^
main.c:42:7: error: unknown type name 's'
   42 | func (s *Scanner) NextLine() string {
      |       ^
main.c:48:7: error: unknown type name 's'
   48 | func (s *Scanner) NextInt() int {
      |       ^
main.c:52:7: error: unknown type name 's'
   52 | func (s *Scanner) NextInt64() int64 {
      |       ^
main.c:57:7: error: unknown type name 's'
   57 | func (s *Scanner) NextFloat() float64 {
      |       ^
main.c:62:7: error: unknown type name 's'
   62 | func (s *Scanner) NextIntArray() []int {
      |       ^
main.c:76:7: error: unknown type name 's'
   76 | func (s *Scanner) NextInt64Array() []int64 {
      |       ^
main.c:90:7: error: unknown type name 's'
   90 | func (s *Scanner) NextMap() map[int]bool {
      |       ^
main.c:107:7: error: unknown type name 's'
  107 | func (s *Scanner) pre() {
      |       ^
main.c:113:7: error: unknown type name 's'
  113 | func (s *Scanner) readLine() {
      |       ^