see_csv.go

package main

import (
	"encoding/csv"
	"fmt"
	"io"
	"log"
	"os"
	"strconv"
	"strings"
)

func main() {
	r := csv.NewReader(os.Stdin)
	h := make(map[string]int64)
	for {
		record, err := r.Read()
		if err == io.EOF {
			break
		}
		if err != nil {
			log.Fatalf("error: %s", err)
		}
		title := record[3]
		amount, _ := strconv.ParseInt(strings.Join(strings.Split(record[4], ","), ""), 0, 64)
		h[title] += amount
	}

	for k, v := range h {
		fmt.Printf("%s:\t%d\n", k, v)
	}
}