46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
#include <stdlib.h>
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#include "lib.h"
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struct ListNode* addTwoNumbers(struct ListNode* l1, struct ListNode* l2) {
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struct ListNode* current = NULL;
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struct ListNode* first_node = NULL;
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int reminder = 0;
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while (l1 != NULL || l2 != NULL || reminder != 0) {
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// Read digits
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int a = 0;
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int b = 0;
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if (l1 != NULL)
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a = l1->val;
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if (l2 != NULL)
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b = l2->val;
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// Move pointers to the next node
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if (l1 != NULL)
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l1 = l1->next;
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if (l2 != NULL)
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l2 = l2->next;
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// Calculate the result
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int digit = (a + b + reminder) % 10;
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reminder = (a + b + reminder) / 10;
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// Create the first node
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if (current == NULL) {
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current = malloc(sizeof(struct ListNode));
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first_node = current;
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}
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// Create regular node
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else {
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current->next = malloc(sizeof(struct ListNode));
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current = current->next;
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}
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// Save the result
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current->val = digit;
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current->next = NULL;
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}
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return first_node;
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}
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