Submission #891138
Source Code Expand
package main import ( "bufio" "os" "strconv" "fmt" ) 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) NextIntArray() []int { s.pre() start := s.p result := []int{} for ; s.p < len(s.buf); s.p++ { if s.buf[s.p] == ' ' { v, _ := strconv.Atoi(string(s.buf[start:s.p])) result = append(result, v) start = s.p + 1 } } v, _ := strconv.Atoi(string(s.buf[start:s.p])) result = append(result, v) 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 } } } func main() { sc := NewScanner() N := sc.NextInt() A := sc.NextIntArray() count := 0 for i := 0; i < N; i++ { if i == A[A[i] - 1] - 1 { count += 1 } } fmt.Println(count / 2) }
Submission Info
Submission Time | |
---|---|
Task | B - Friendly Rabbits |
User | yuki2006 |
Language | Go (1.6) |
Score | 200 |
Code Size | 1821 Byte |
Status | AC |
Exec Time | 27 ms |
Memory | 6528 KB |
Judge Result
Set Name | Sample | All | ||||
---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 200 / 200 | ||||
Status |
|
|
Set Name | Test Cases |
---|---|
Sample | 0_00.txt, 0_01.txt, 0_02.txt |
All | 0_00.txt, 0_01.txt, 0_02.txt, 1_00.txt, 1_01.txt, 1_02.txt, 1_03.txt, 1_04.txt, 1_05.txt, 1_06.txt, 1_07.txt, 1_08.txt, 1_09.txt, 1_10.txt, 1_11.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
0_00.txt | AC | 2 ms | 640 KB |
0_01.txt | AC | 2 ms | 640 KB |
0_02.txt | AC | 2 ms | 640 KB |
1_00.txt | AC | 2 ms | 640 KB |
1_01.txt | AC | 24 ms | 5376 KB |
1_02.txt | AC | 21 ms | 6400 KB |
1_03.txt | AC | 26 ms | 6400 KB |
1_04.txt | AC | 23 ms | 5376 KB |
1_05.txt | AC | 21 ms | 6272 KB |
1_06.txt | AC | 21 ms | 6528 KB |
1_07.txt | AC | 21 ms | 6400 KB |
1_08.txt | AC | 10 ms | 3456 KB |
1_09.txt | AC | 27 ms | 6272 KB |
1_10.txt | AC | 19 ms | 5248 KB |
1_11.txt | AC | 6 ms | 1792 KB |