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#include<stdio.h>
int main(void){
	int arr1[20];
	int j = 0;
	for (int i = 0;i <= 9;i++) {
		arr1[i] = i;
	}
	for (int i = 10;i <= 19;i++) {
		scanf_s("%d", &arr1[i]);
	}
	for (int i = 0;i <= 19;i++) {
		printf("%d,", arr1[i]);
		j++;
		if (j == 5) {
			printf("\n");
			j = 0;
		}
	}
}


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#include<stdio.h>
int main(void) {
	int arr1[10];
	int j = 0;
	for (int i = 0;i <= 9;i++) {
		scanf_s("%d", &arr1[i]);
	}
	for (int i = 0;i <= 9;i++) {
		printf("%d,",2 * arr1[9 - i]);
	}
}


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#include <stdio.h>
int main() {
    int a[16] = { 1, 3, 5, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42 }; 
    printf("3的倍数的元素：\n");
    for (int i = 0; i < 16; i++) {
        if (a[i] % 3 == 0) {
            printf("%d ", a[i]);
        }
    }
    printf("\n");
    printf("下标为3的倍数的元素：\n");
    for (int i = 0; i < 16; i++) {
        if (i % 3 == 0) {
            printf("%d ", a[i]);
        }
    }
    printf("\n");
    return 0;
}

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#include<stdio.h>
int main(void) {
	int arr1[16] = { 1,2,3,4,5,5,6,7,8,9,10,12,13,14,15,16 };
	int arrnew[16];
	int j = 0;
	for (int i = 0;i <= 15;i++) {
		if (arr1[i] % 3 != 0) {
			arrnew[j++] = arr1[i];
		}
		


	}
	for (int k = 0;k <j;k++) {
		printf("%d,",arrnew[k]);
	}
	return 0;
}

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#include<stdio.h>
int main(void) {
	int b;
	int arr1[16] = { 1,2,3,4,5,5,6,7,8,9,10,12,13,14,15 };
	scanf_s("%d\n", &b);
	for (int i = 15;i>0;i--) {
		arr1[i] = arr1[i-1];
	}
	arr1[0] = b;
	for (int i = 0; i < 16; i++) {
		printf("%d ", arr1[i]);
	}

	return 0;
}

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