제출 #28443

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
28443		탕탕탕! 핑거팁 니 맘을 겨눌게~ (#68)	포도주 시음 (FXCUP2_wine)	C11	0 / 1	0 ms	1116 KiB

wine

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

int compare(void *first, void *second)
{
	if (*(int*)first > *(int*)second)
		return 1;
	else if (*(int*)first < *(int*)second)
		return -1;
	else
		return 0;
}

int main()
{
	int N, K, i, result = 0;
	int temp = 0, prev = 0;
	int *arr;
	scanf("%d %d", &N, &K);
	arr = (int*)malloc(sizeof(int)*N);
	for (i = 0; i < N; i++) {
		scanf("%d", &arr[i]);
	}
	qsort(arr, N, sizeof(int), compare);
	for (i = 1; i <= K; i++) {
		if (i % 2 == 1) {
			temp = arr[N - i];
			if (i == 1)
				result += temp;
			else
				result += temp - prev;
		}
		else {
			prev = arr[i - 2];
		}
	}
	printf("%d", result);
}

컴파일 시 표준 에러 (stderr) 메시지

wine.c: In function 'main':
wine.c:24:29: warning: passing argument 4 of 'qsort' from incompatible pointer type [-Wincompatible-pointer-types]
  qsort(arr, N, sizeof(int), compare);
                             ^
In file included from wine.c:2:0:
/usr/include/stdlib.h:764:13: note: expected '__compar_fn_t {aka int (*)(const void *, const void *)}' but argument is of type 'int (*)(void *, void *)'
 extern void qsort (void *__base, size_t __nmemb, size_t __size,
             ^
wine.c:19:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &N, &K);
  ^
wine.c:22:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &arr[i]);
   ^

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