68 lines
1.1 KiB
C
68 lines
1.1 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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typedef struct Node {
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int data;
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struct Node *next;
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} Node;
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Node *appendNode(Node *n) {
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int data;
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scanf("%d", &data);
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Node *node = malloc(sizeof(struct Node));
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node->data = data;
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node->next = NULL;
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n->next = node;
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return node;
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}
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Node *makeList(int col) {
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Node *head, *ptr;
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head = malloc(sizeof(Node));
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head->next = NULL;
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ptr = head;
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for (int i = 0; i < col; i++) {
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ptr = appendNode(ptr);
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}
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return head;
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}
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void delete(Node *head) {
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if (head->next == NULL) {
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free(head);
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} else {
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delete(head->next);
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}
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}
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int main(void) {
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int rows;
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int col;
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int count;
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scanf("%d", &rows);
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Node *ptr;
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for (int i = 0; i < rows; i++) {
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scanf("%d", &col);
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Node *head = makeList(col);
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count = 0;
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for (ptr = head->next; ptr != NULL; ptr = ptr->next) {
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if (count % 2 == 1) {
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if (count == 1) {
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printf("%d", ptr->data);
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} else {
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printf(" %d", ptr->data);
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}
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}
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count++;
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}
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printf("\n");
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delete(head);
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}
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return 0;
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}
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