golang力扣leetcode 438.找到字符串中所有字母异位词

package main
func findAnagrams(s string, p string) []int {
  var result []int
  wind := make(map[byte]int)
  need := make(map[byte]int)
  for i := range p {
    need[p[i]]++
  }
  left, right, match := 0, 0, 0
  for right < len(s) {
    c := s[right]
    right++
    if need[c] != 0 {
      wind[c]++
      if wind[c] == need[c] {
        match++
      }
    }
    for right-left == len(p) {
      if match == len(need) {
        result = append(result, left)
      }
      c = s[left]
      left++
      if need[c] != 0 {
        if wind[c] == need[c] {
          match--
        }
        wind[c]--
      }
    }
  }
  return result
}