[OT] The horizon of a stream

[bearophile]

First try, D1, Phobos:

import std.stdio, std.stream;

void main() {
    int[string] seen;
    int horizon;

    int nline;
    foreach (string line; new BufferedFile("data.txt")) {
        auto pos_ptr = line in seen;
        if (pos_ptr) {
            if ((nline - *pos_ptr) >  horizon)
                 horizon = nline - *pos_ptr;
        } else
            seen[line.dup] = nline;
        nline++;
    }

    writefln(horizon);
}


Idem, with my libs:

import d.all, d.string;

void main() {
    int[string] seen;
    int horizon;

    foreach (nline, line; xfile("data.txt")) {
        auto pos_ptr = line in seen;
        if (pos_ptr) {
            if ((nline - *pos_ptr) >  horizon)
                 horizon = nline - *pos_ptr;
        } else
            seen[line.dup] = nline;
    }

    putr(horizon);
    putr(seen);
}

I'll show an "improved" version soon...

Bye,
bearophile