clplaner.c
author Markus Bröker <mbroeker@largo.dyndns.tv>
Fri, 27 Dec 2013 16:00:09 +0100
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parent 78 e87e0fe4a7db
permissions -rw-r--r--
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/**
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 * clplaner.c
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 * Copyright (C) 2008 Markus Broeker
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <limits.h>
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#define MAXLOOP 25
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#define MAXLINE 80
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#ifndef MAXTEAM
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#define MAXTEAM 32
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#endif
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#define getrandom(max) (1+(int)((float)(max)*rand()/RAND_MAX))
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void swap (int *v, int i, int j)
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{
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    int temp;
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    if (i == j)
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        return;
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    temp = v[i];
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    v[i] = v[j];
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    v[j] = temp;
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}
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void cleanup (char **first, char **second)
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{
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    int i;
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    i = 0;
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    while (first[i] != NULL)
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        free (first[i++]);
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    i = 0;
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    while (second[i] != NULL)
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        free (second[i++]);
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}
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unsigned int time_seed ()
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{
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    time_t now = time (NULL);
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    unsigned char *p = (unsigned char *)&now;
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    unsigned int seed = 0;
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    size_t i;
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    for (i = 0; i < sizeof (now); i++)
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        seed = seed * (UCHAR_MAX + 2U) + p[i];
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    return seed;
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}
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int getTeams (FILE * f, char **first, int *first_idx, char **second, int *second_idx)
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{
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    int i;
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    char buffer[MAXLINE + 1];
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    char *ptr;
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    i = 0;
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    while ((i < MAXTEAM) && fgets (buffer, MAXLINE, f) != NULL) {
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        if ((first[i] = malloc (MAXLINE + 1)) == NULL) {
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            perror ("malloc");
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            break;
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        }
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        if ((ptr = strchr (buffer, '\n')))
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            *ptr = '\0';
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        strncpy (first[i], buffer, MAXLINE);
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        first_idx[i] = i;
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        if (fgets (buffer, MAXLINE, f) == NULL) {
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            printf ("You need 2, 4, 6, ..., or %d teams in your file\n", 2 * MAXTEAM);
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            second[i] = first[i + 1] = NULL;
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            cleanup (first, second);
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            fclose (f);
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            exit (EXIT_FAILURE);
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        }
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        if ((second[i] = malloc (MAXLINE + 1)) == NULL) {
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            perror ("malloc");
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            break;
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        }
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        if ((ptr = strchr (buffer, '\n')))
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            *ptr = '\0';
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        strncpy (second[i], buffer, MAXLINE);
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        second_idx[i] = i;
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        i++;
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    }
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    first[i] = second[i] = NULL;
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    return i;
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}
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void shakeTeamIdx (int *first_idx, int *second_idx, int teams)
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{
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    int i, j, k;
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    /*
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     * Who wins the Title?
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     */
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    if (teams == 1)
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        return;
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    /*
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     * swap the index MAXLOOP times...
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     */
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    for (i = 0; i < MAXLOOP; i++) {
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        for (j = 0; j < teams; j++) {
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            k = getrandom (teams - 1);
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            swap (second_idx, j, k);
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            k = getrandom (teams - 1);
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            swap (first_idx, j, k);
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        }
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    }
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    /*
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     * avoid group clashes
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     */
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    for (i = 0; i < teams - 1; i++) {
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        if (first_idx[i] == second_idx[i])
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            swap (first_idx, i, i + 1);
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    }
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    if (first_idx[i] == second_idx[i])
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        swap (first_idx, i, i - 1);
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}
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int main (int argc, char **argv)
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{
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    FILE *f;
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    char *first[MAXTEAM + 1];
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    char *second[MAXTEAM + 1];
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    int first_idx[MAXTEAM];
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    int second_idx[MAXTEAM];
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    int i, teams;
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    if (argc != 2) {
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        printf ("Usage: %s FILE\n\n", argv[0]);
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        printf ("One Team per line, seperated by newline, n=2, 4, ..., or %d\n", 2 * MAXTEAM);
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        printf ("Team n is the Groupwinner, n+1 is the Runners Up\n");
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        printf ("Report bugs to mbroeker@largo.homelinux.org\n");
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        return EXIT_FAILURE;
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    }
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    if ((f = fopen (argv[1], "r")) == NULL) {
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        perror ("fopen");
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        return EXIT_FAILURE;
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    }
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    srand (time_seed ());
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    teams = getTeams (f, first, first_idx, second, second_idx);
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    shakeTeamIdx (first_idx, second_idx, teams);
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    for (i = 0; i < teams; i++)
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        printf ("%30s vs %s\n", second[second_idx[i]], first[first_idx[i]]);
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    cleanup (first, second);
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    if (f != NULL)
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        fclose (f);
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    return EXIT_SUCCESS;
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}