Qiita Teams that are logged in
You are not logged in to any team

Log in to Qiita Team
Community
OrganizationAdvent CalendarQiitadon (β)
Service
Qiita JobsQiita ZineQiita Blog
0
Help us understand the problem. What is going on with this article?
@iamwizone

ソートアルゴリズム (バブル・シェーカー・コム)

More than 1 year has passed since last update.

基本的なソートアルゴリズムのc言語による実装
バブルソート、シェーカーソート、コムソートの3つのアルゴリズムの処理時間の計算

sort.c
/* Comparing the time of shaker sort with that of bubble sort */

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

void sort_check(int *, int, int);
void swap(int *, int, int);

int main(void){

    int *a;
    int *b;

    int flag = 0;
    int step = 0, change = 0;
    int max;

    int m;
    int number_max;
    int i, j;
    int h;

    clock_t start, end;

    double bubble_time, shaker_time, comb_time;
    int bubble_step, shaker_step, comb_step;
    int bubble_change, shaker_change, comb_change;

変数の宣言
aは並び替えをするための配列、bの中身も基本的には同じ
stepは配列要素の比較回数、changeは配列要素の交換回数

sort.c
    // 配列の要素数
    m = 50000;
    number_max = 100000;
    a = (int *)malloc(sizeof(int)*m);
    b = (int *)malloc(sizeof(int)*m);

    srand((unsigned int)time(NULL));

    // insert number into an array at random
    printf("-- array --\n\n");
    for(i = 0; i < m; i++){
        b[i] = rand()%number_max;
        a[i] = b[i];
        if(i < 10 || m - 10 < i) printf("a[%d] = %d\n", i, a[i]);
    }

number_maxに関しては、
0からnumber_maxまでの整数をランダムに配列に格納する、という意味
配列の要素数は50000、number_maxは100000とした。

尚、すべて昇順である。

sort.c
    // Measuring the time of bubble short
    start = clock();

    change = 0;
    step = 0;

    for(i = m-1; i >= 0; i--){
        flag = 0;
        for(j = 0; j < i; j++){
            step++;
            if(a[j] > a[j+1]){
                flag++;
                change++;
                swap(a, j, j+1);
            }
        }
        if(flag == 0) break;
    }

    end = clock();

    sort_check(a, m, 0);

    bubble_time = (double)(end - start)/(double)CLOCKS_PER_SEC;
    bubble_step = step;
    bubble_change = change;

    // 計算時間などを表示
    printf("\n");
    printf("-- bubble sort --\n");
    printf("\n");
    printf("calculation time (bubble sort) : %lf [sec]\n", bubble_time);
    printf("\n");
    printf("comparing time : %d, changing time : %d\n", bubble_step, bubble_change);
    printf("\n");

    // バブルソート後の配列を表示
    for(int i = 0; i < m; i++)
        if(i < 10 || m-10 <= i) printf("a[%d] = %d\n", i, a[i]);

バブルソート
sort_check関数は、きちんとソートされているかどうかを判定する関数(後述)

sort.c

    for(i = 0; i < m; i++) a[i] = b[i];

    // Measuring the time of shaker sort
    start = clock();

    step = 0;
    change = 0;

    for(i = m-1; i >= 0; i--){
        flag = 0;
        for(j = m-1-i; j < i; j++){
                step++;
            if(a[j] > a[j+1]){
                flag++;
                change++;
                swap(a, j, j+1);
            }
        }
        if(flag == 0) break;

        for(j = i-1; j > m-1-i; j--){
            step++;
            if(a[j] < a[j-1]){
                flag++;
                change++;
                swap(a, j, j-1);
            }
        }
        if(flag == 0) break;

    }

    end = clock();

    sort_check(a, m, 0);

    shaker_time = (double)(end - start)/(double)CLOCKS_PER_SEC;
    shaker_step = step;
    shaker_change = change;

    // 計算時間などを表示
    printf("\n");
    printf("-- shaker sort --\n");
    printf("\n");
    printf("calculation time (shaker sort) : %lf [sec]\n", shaker_time);
    printf("\n");
    printf("comparing time : %d, changing time : %d\n", shaker_step, shaker_change);
    printf("\n");

    // シェーカーソート後の配列を表示
    for(i = 0; i < m; i++)
        if(i < 10 || m-10 <= i) printf("a[%d] = %d\n", i, a[i]);

シェーカーソート

sort.c

    for(i = 0; i < m; i++) a[i] = b[i];

    // Measuring the time of comb short
    start = clock();

    step = 0;
    change = 0;
    flag = 1;

    h = m*10/13;

    while(h >= 1 && flag != 0){
        flag = 0;
        for(i = m-h-1; i >= 0; i--){
            step++;
            if(a[i] > a[i+h]){
                change++;
                flag++;
                swap(a, i, i+h);
            }
        }
        if(h >= 2) h = h*10/13;

    }

    end = clock();

    sort_check(a, m, 0);

    comb_time = (end - start)/(double)CLOCKS_PER_SEC;
    comb_step = step;
    comb_change = change;

    // 計算時間などを表示
    printf("\n");
    printf("-- comb sort --\n");
    printf("\n");
    printf("calculation time (comb sort) : %lf [sec]\n", comb_time);
    printf("\n");
    printf("comparing time : %d, changing time : %d\n", comb_step, comb_change);
    printf("\n");

    // コムソート後の配列を表示
    for(i = 0; i < m; i++)
        if(i < 10 || m-10 <= i) printf("a[%d] = %d\n", i, a[i]);

コムソート

計算時間
time.png

やはり、バブル>シェーカー>コム となっている。

コムソートの時間のみのグラフ↓

time(comb).png

0
Help us understand the problem. What is going on with this article?
Why not register and get more from Qiita?
  1. We will deliver articles that match you
    By following users and tags, you can catch up information on technical fields that you are interested in as a whole
  2. you can read useful information later efficiently
    By "stocking" the articles you like, you can search right away
iamwizone
C/C++/Python/MATLAB ほとんどC言語 いろんな数値計算をしてみる

Comments

No comments
Sign up for free and join this conversation.
Sign Up
If you already have a Qiita account Login
0
Help us understand the problem. What is going on with this article?