PE 04.01.20 Q7

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

int indexOf(int a, int numbers[], int size) {
    int i;

    for (i = 0; i < size; i++) {
        if (numbers[i] == a) {
            return i;
        }
    }
    return -1;
}

int main() {
  system("cls");
  //INPUT - @STUDENT:ADD YOUR CODE FOR INPUT HERE:
    int i, a[7];
    for(i = 0; i < 7; i++) {
        scanf("%d", &a[i]);
    }
  // Fixed Do not edit anything here.
  printf("\nOUTPUT:\n");
  //@STUDENT: WRITE YOUR OUTPUT HERE:
    int numbers[7];
    int count[7];
    int size = 0;

    int index, max, next;
    for(i = 0; i < 7; i++) {
        if (a[i] >= 100 && a[i] <= 999) { // so co 3 chu so
            index = indexOf(a[i], numbers, size);
            if (index != -1) { // tim thay ~> tang count 1
                count[index]++;
            } else {
                numbers[size] = a[i];
                count[size] = 1;
                size++;
            }
        }
    }

    if (size == 0) {
        printf("No three-digit number");
    } else {
        // tim so lan xuat hien nhieu` nhat'
        max = -1;
        for(i = 0; i < size; i++) {
            if (count[i] > max) {
                max = count[i];
            }
        }

        next = 0; // index tiep theo sau khi in so dau tien
        for(i = 0; i < size; i++) {
            if (count[i] == max) {
                printf("%d", numbers[i]);
                next = i;
                break;
            }
        }
        for(i = next+1; i < size; i++) {
            if (count[i] == max) {
                printf(" %d", numbers[i]);
            }
        }
    }


  //--FIXED PART - DO NOT EDIT ANY THINGS HERE
  printf("\n");
  system ("pause");
  return(0);
}