q83.go

package main

import (
	"bufio"
	"fmt"
	"io"
	"os"
	"strings"
)

type key struct {
	t, c string
}

func main() {
	f, err := os.Open("../data/q82.out.txt")
	defer f.Close()
	if err != nil {
		panic(err)
	}

	r := bufio.NewReaderSize(f, 4096)
	m := make(map[key]int)
	Nt := make(map[string]int)
	Nc := make(map[string]int)

	for {
		l, _, err := r.ReadLine()
		if err == io.EOF {
			break
		}
		if err != nil {
			panic(err)
		}

		str := strings.Split(string(l), "\t")
		k := key{
			t: str[0],
			c: str[1],
		}
		m[k]++
		Nt[k.t]++
		Nc[k.c]++
	}

	fmt.Println("N: ", len(m))
}