Submission #68583068

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Source Code Expand

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

int cmp(const void* x, const void* y) {
	int a = *(const int*)x, b = *(const int*)y;
	return a < b ? -1 : a > b;
}

int main(void) {
	int N, M;
	int* A;
	int* B;
	int i;
	int first = 1;
	int pos = 0;
	if (scanf("%d%d", &N, &M) != 2) return 1;
	A = malloc(sizeof(*A) * N);
	B = malloc(sizeof(*B) * M);
	if (A == NULL || B == NULL) return 2;
	for (i = 0; i < N; i++) {
		if (scanf("%d", &A[i]) != 1) return 1;
	}
	for (i = 0; i < M; i++) {
		if (scanf("%d", &B[i]) != 1) return 1;
	}
	qsort(B, M, sizeof(*B), cmp);
	for (i = 0; i < N; i++) {
		while (pos < M && A[i] > B[pos]) pos++;
		if (pos < M && A[i] == B[pos]) {
			pos++;
		} else {
			printf(" %d" + first, A[i]);
			first = 0;
		}
	}
	if (!first) putchar('\n');
	return 0;
}

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