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Maxime Menault 2024-09-02 23:11:04 +02:00
commit fe64cb7aa5
3 changed files with 212 additions and 0 deletions

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// Heapsort Algorithm
// M.Menault 2024
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
void print_array(int* array, int length)
{
static int count = 0;
int i = 0;
printf("(%3.3d) Array : ",count++);
for(i=0; i < length; i++)
{
printf("%5d ",array[i]);
}
printf("\n");
}
void sift(int* array, int node, int length)
{
int largest_node = node;
int left_node = 2*node+1;
int right_node = 2*node+2;
int temp_value = 0;
if(left_node < length && array[left_node] > array[largest_node])
{
largest_node = left_node;
}
if(right_node < length && array[right_node] > array[largest_node])
{
largest_node = right_node;
}
if(largest_node != node)
{
temp_value = array[node];
array[node] = array[largest_node];
array[largest_node] = temp_value;
sift(array,length,largest_node);
}
}
void heapsort(int* array, int length)
{
int i = 0;
int temp_value = 0;
// Sift the current array (binary tree)
for(i=(length/2); i >= 0; i--)
{
sift(array,i,length);
}
// Heapsort !
for(i=length-1; i > 0; i--)
{
temp_value = array[i];
array[i] = array[0];
array[0] = temp_value;
sift(array,0,i);
}
}
void generate_array(int* array, int length)
{
int i = 0;
static int first_call = 1;
if(first_call)
{
first_call = 0;
srand(time(NULL));
}
for(i=0; i < length; i++)
{
array[i] = rand() % 20 + 1;
}
}

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#ifndef __HEAPSORT__
#define __HEAPSORT__
void heapsort(int* array, int length);
void generate_array(int* array, int length);
void print_array(int* array, int length);
#endif

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// Student rank
// M.Menault 2024
#include <stdio.h>
#include <stdlib.h>
#include "heapsort.h"
void generate_grades(int** students_array, int students_number, int grades_number)
{
int i = 0;
for(i=0;i<students_number;i++)
{
students_array[i] = (int*) malloc(grades_number*sizeof(int));
generate_array(students_array[i],grades_number);
}
}
void generate_ranks(int** students_array, int students_number, int grades_number)
{
int i = 0;
int j = 0;
for(i=0;i<students_number;i++)
{
students_array[i] = (int*) malloc(grades_number*sizeof(int));
for(j=0;j<grades_number;j++)
{
students_array[i][j] = -1;
}
}
}
void free_array(int** students_array, int students_number)
{
int i = 0;
for(i=0;i<students_number;i++)
{
free(students_array[i]);
}
}
void print_student_array(int** students_array, int students_number, int grades_number)
{
int i = 0;
printf("----------------------\n");
for(i=0;i<students_number;i++)
{
printf("Student %d : ",i);
print_array(students_array[i],grades_number);
}
printf("----------------------\n");
}
int find_rank_student(int student_grade, int* grades_array, int students_number)
{
int position = -1;
int i = 0;
heapsort(grades_array,students_number);
for(i = students_number-1; i >= 0; i--)
{
if(grades_array[i] == student_grade)
{
position = students_number-i;
break;
}
}
return position;
}
void sort_students(int** students_rank, int** students_array, int students_number, int grades_number)
{
int i = 0, j = 0;
for(i = 0; i < grades_number; i++)
{
int * grades = (int*) malloc(students_number*sizeof(int));
for(j = 0; j < students_number; j++)
{
grades[j] = students_array[j][i];
}
heapsort(grades,students_number);
for(j = 0; j < students_number; j++)
{
students_rank[j][i] = find_rank_student(students_array[j][i],grades,students_number);
}
free(grades);
}
}
int main(int argc, char** argv)
{
int** student_grades = NULL;
int** student_ranks = NULL;
int students_length = 0;
int grades_length = 0;
int debug_mode = 0;
if(argc != 4)
{
printf("Usage : %s <number of student> <number of grade per student> <debug mode : 0|1>\n",argv[0]);
return -1;
}
students_length = atoi(argv[1]);
grades_length = atoi(argv[2]);
debug_mode = atoi(argv[3]);
student_grades = (int**) malloc(students_length*sizeof(int*));
student_ranks = (int**) malloc(students_length*sizeof(int*));
generate_grades(student_grades,students_length,grades_length);
generate_ranks(student_ranks,students_length,grades_length);
sort_students(student_ranks,student_grades,students_length,grades_length);
if(debug_mode)
{
print_student_array(student_grades,students_length,grades_length);
print_student_array(student_ranks,students_length,grades_length);
}
free_array(student_grades,students_length);
free_array(student_ranks,students_length);
free(student_grades);
free(student_ranks);
return 0;
}