pvjc24/cv5/program.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct student {
  char *name;
  int vote_count;
} student_t;

int compare_students(const void *a, const void *b) {
  const student_t *student_a = a;
  const student_t *student_b = b;

  if (student_a->vote_count > student_b->vote_count) {
    return -1;
  } else if (student_a->vote_count < student_b->vote_count) {
    return 1;
  }

  return strcmp(student_a->name, student_b->name);
}

int main() {
  student_t *students = NULL;
  int students_capacity = 0;

  char line[1024];
  while (fgets(line, sizeof(line), stdin)) {
    int vote_count;
    char *name;
    sscanf(line, "%d %ms", &vote_count, &name);

    if (students_capacity <= vote_count) {
      students_capacity *= 2;
      student_t *new_students = realloc(students, students_capacity * sizeof(student_t));
      if (new_students == NULL) {
        fprintf(stderr, "Error: Memory reallocation failed\n");
        return 1;
      }
      students = new_students;
    }

    students[vote_count].name = name;
    students[vote_count].vote_count++;
  }

  qsort(students, students_capacity, sizeof(student_t), compare_students);

  printf("Results:\n");
  for (int i = 0; i < students_capacity; i++) {
    if (students[i].vote_count > 0) {
      printf("%d %s\n", students[i].vote_count, students[i].name);
      students[i].name = NULL;
    }
  }

  return 0;
}