baekjoon 1269

Code

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>

int compare(int* a, int* b);

int main(void) {
	int sizeA, sizeB;

	scanf("%d %d", &sizeA, &sizeB);
	
	int sum = sizeA + sizeB;

	int* arr = (int*)malloc(sizeof(int) * sum);

	for (int i = 0; i < sum; i++) {
		scanf("%d", &arr[i]);
	}

	qsort(arr, sum, sizeof(int), compare);

	int count = 0;

	for (int i = 1; i < sum; i++) {
		if (arr[i] == arr[i - 1]) {
			count += 2;
		}
	}

	printf("%d", (sum - count));

	return 0;
}

int compare(int* a, int* b) {
	return *((int*)a) - *((int*)b);
}