两个升序列的相同元素 代码(C)

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两个升序列的相同元素, 需要使用两个指针, 依次遍历, 如果相等输出, 如果小于或大于, 则增加一个指针.

直到输出所有的值.

代码:

/*
 * main.cpp
 *
 *  Created on: 2014.9.19
 *      Author: spike
 */

#include <stdio.h>

int Common(int data1[], int length1, int data2[], int length2, int res[]) {
	if (data1 == NULL || length1 <= 0 || data2 == NULL || length2 <= 0)
		return -1;
	int i=0, j=0, k=0;
	while (i < length1 && j < length2) {
		if (data1[i] == data2[j]) {
			res[k++] = data1[i];
			i++;
			j++;
		}
		else if (data1[i] < data2[j])
			i++;
		else
			j++;
	}
	return k;
}


int main(void)
{
	int data1[] = {1, 2, 4, 5, 6, 9, 11};
	int data2[] = {2, 5, 6, 8, 12};
	int length1 = sizeof(data1)/sizeof(data1[0]);
	int length2 = sizeof(data2)/sizeof(data2[0]);
	int max = length1 > length2 ? length1 : length2;
	int* res = new int[max];
	int num = Common(data1, length1, data2, length2, res);
	for (int i=0; i<num; ++i) {
		printf("%d ", res[i]);
	}
	printf("\n");

    return 0;
}

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编程算法 - 两个升序列的相同元素 代码(C)