doulan7166 2013-02-17 18:36
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大UTF-8字符串的快速fmt.Scanf()

I have a string of about 8000000 UTF-8 characters. Scanning it via fmt.Scanf() takes about 10 seconds, how can I do it faster? I have a Go wrapper for C scanf() function that was written by my teacher as a workaround for some bugs in Go's fmt.Scanf(), it works in 1-2 seconds, but I don't like using side packages for such simple tasks. Could you suggest some faster way of reading strings in pure Go?

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  • dongruyan4948 2013-02-17 19:13
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    Found the solution. bufio works much faster (as it's buffered, and fmt's functions are not, and it doesn't parse anything):

    reader := bufio.NewReader(os.Stdin)
    str, _ := reader.ReadString('
    ')   // Like fmt.Scanf("%s", &str), but faster
    var x, y rune
    fmt.Fscanf(reader, "%c %c", &x, &y) // I need to read something else
                                        // (see comments for the question)
                                        // It's easy, as I can use fmt.Fscanf
    

    ...even faster that that C scanf() wrapper.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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