c - 查找数组之间的共同元素(匹配元素)

Question

考虑一下我是否有一个输入，其中作为输入的数组数量不固定，并且每个数组中的元素数量也不固定。所以每次我的输入发生变化时，

 Example 1: 1st input

 1st array= [2,3,4]
 2nd array =[6,7,8,9]
 3rd array=[5,3,12]

 Example 2: 2nd input

 1st array= [6,3,4,8]
 2nd array =[6,7,4,9]
 3rd array=[1,2,12]
 4th array= [20,21,22,23,25]

所需的解决方案是，第一个数组被视为引用数组，下一组数组将相对于第一个数组(引用)进行检查，要求第二个数组不应有公共(public)元素第一个数组，然后继续检查第三个数组不应与第一个数组有公共(public)元素。

 from 1st Example 

 1st array= [2,3,4] -- reference array
 1st array= [2,3,4] is compared to 2nd array =[6,7,8,9] 
 1st array= [2,3,4] is compared to  3rd array=[5,3,12]

 solution needed:
 + print 1st array( reference array)
 + if no common elements found between 1st array and 2nd array, from ex. no common elements found, so print out the 2nd array.
 + same for 3rd array, from ex. there is common element(3 is present in both first and third array), so dont print.

我已经尝试过将输入存储在二维数组中，但我搞砸了。请指导我使用您的算法/代码进行计算。

Answer 1

注意我如何创建一个数组来包含各个数组的长度，以及一个参数来告诉该数组有多长。

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

void print_array(int *a, int size) {
    int i;
    for (i = 0; i<size; i++) {
        printf("%d ", a[i]);
    }

    printf("\n");
}


bool is_in(int *a, int size, int elem) {
    int i;
    for (i=0; i<size; i++) {
        if (a[i] == elem) {
            return true;
        }
    }
    return false;
}

void f(int **a, int a_siz, int* sizes) {
    print_array(a[0],sizes[0]);

    for (int i=1; i< a_siz; i++) {
        bool common_element = false;

        for (int k=0; k< sizes[i]; k++) {
            if (is_in(a[0],sizes[0],a[i][k])) {
                common_element = true;
                break;
            }
        }

        if (! common_element) {
            print_array(a[i],sizes[i]);
        }
    }

}



int main() {
    int s = 3;
    int sizes[] = {3,4,3};
    int **a = malloc(sizeof(int*)*3);
    for (int i=0; i<s; i++) {
        a[i] = malloc(sizeof(int*)*sizes[i]);
    }

    a[0][0] = 2;
    a[0][1] = 3;
    a[0][2] = 4;

    a[1][0] = 4;
    a[1][1] = 7;
    a[1][2] = 8;
    a[1][3] = 9;

    a[2][0] = 5;
    a[2][1] = 44;
    a[2][2] = 12;

    f(a,s,&sizes);
}