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substr_count.go
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/
substr_count.go
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package main
import (
"bufio"
"fmt"
"os"
)
func substrCount(n int, s string) int64 {
var result int64
for p := 0; p < n; p++ {
var repeat int64 = 1
for ; p < n-1 && s[p] == s[p+1]; p++ {
repeat++
}
result += repeat * (repeat + 1) / 2
for i := 1; p-i >= 0 && p+i < n && s[p+i] == s[p-1] && s[p-i] == s[p-1]; i++ {
result++
}
}
return result
}
func main() {
stdin, err := os.Open(os.Getenv("INPUT_PATH"))
if err != nil {
stdin = os.Stdin
}
defer stdin.Close()
stdout, err := os.Create(os.Getenv("OUTPUT_PATH"))
if err != nil {
stdout = os.Stdout
}
defer stdout.Close()
reader := bufio.NewReaderSize(stdin, 1024*1024)
writer := bufio.NewWriterSize(stdout, 1024*1024)
var n int
var s string
_, err = fmt.Fscan(reader, &n, &s)
checkError(err)
result := substrCount(n, s)
fmt.Fprintln(writer, result)
writer.Flush()
}
func checkError(err error) {
if err != nil {
panic(err)
}
}