TD1_DEV51_Qualite_Algo/student_rank.c

// 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;
}