Solved

# Generating a schedule with 30 teams

Posted on 2004-09-21
322 Views
Last Modified: 2010-04-17
Hello

Im asking this question here (and not in the Math/Science section) because i need the code (i would prefer Java or C/C++) that will generate a sport team schedule following these rules:

case a:
- There are 30 teams
- Each teams playing 1 time against all other team (so 29 games per team)
- Cannot play twice against the same team
- Schedule must be random (if schedule is twice in a row, the results will differ)

case b:
- There are 30 teams
- Each teams playing 2 times against all other team (so 58 games per team)
- Schedule must be random (if schedule is twice in a row, the results will differ)

Big thanks to all who will try to help me out here.
Thanks

-Oli
0
Question by:oroussea
[X]
###### Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

• Help others & share knowledge
• Earn cash & points
• Learn & ask questions
• 2
4 Comments

LVL 84

Accepted Solution

ozo earned 125 total points
ID: 12112443
#include <stdlib.h>
char *teams[]={"team1", "team2", "team3", "team4", "team5", "team6", "team7", "team8", "team9", "team10", "team11", "team12", "team13", "team14", "team15", "team16", "team17", "team18", "team19", "team20", "team21", "team22", "team23", "team24", "team25", "team26", "team27", "team28", "team29", "team30"};
char *games[15];
void shuffle(char *array[],int n){
int i;
for( i=n; --i; ){
int j = rand() % (i+1);
char *t = array[i];
array[i] = array[j];
array[j] = t;
}
}
main(){
int r,s,t;
for( s=0;s<15; s+=1 ){ games[s] = (char *)malloc(20); }
srand(time());
printf("a\n");
shuffle(teams,30);
for( r=0;r<29;r++ ){
for( s=0;s<15;s++ ){
sprintf(games[s],"%s vs. %s",teams[s?(r+s-1)%29+1:0],teams[(28-s+r)%29+1]);
}
shuffle(games,15);
for( s=0;s<15;s++ ){
printf("%s\n",games[s]);
}
printf("\n");
}
printf("b\n");
shuffle(teams,30);
for( r=0;r<29;r++ ){
for( s=0;s<15;s++ ){
sprintf(games[s],"%s vs. %s",teams[s?(r+s-1)%29+1:0],teams[(28-s+r)%29+1]);
}
shuffle(games,15);
for( s=0;s<15;s++ ){
printf("%s\n",games[s]);
}
printf("\n");
}
}
0

Author Comment

ID: 12112619
Thanks for the quick reply ozo

But i dont see any diff between A and B...

But A seems to do it...

Thanks

-Oli
0

LVL 84

Expert Comment

ID: 12116490
Isn't case b just case a repeated?
0

LVL 101

Expert Comment

ID: 12118384
With the second shuffle of the teams the second half schedule should be different from the first half.

That should work unless you want it to be possible for teams 1 & 2 to be able to play back to back games or twice at any time in the season rather than once in the first 29 games and the second game in the last 29 games.

mlmcc

0

## Featured Post

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Make the most of your online learning experience.
Part One of the two-part Q&A series with MalwareTech.
Introduction to Processes
Starting up a Project
###### Suggested Courses
Course of the Month6 days, 19 hours left to enroll

#### 623 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.