제출 #28488

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
28488		탕탕탕! 핑거팁 니 맘을 겨눌게~ (#68)	포도주 시음 (FXCUP2_wine)	C11	0 / 1	1000 ms	1508 KiB

wine

#include <stdio.h>

void quickSort(int numbers[], int array_size);
void q_sort(int numbers[], int left, int right);

void quickSort(int numbers[], int array_size)
{
	q_sort(numbers, 0, array_size - 1);
}

void q_sort(int numbers[], int left, int right)
{
	int pivot, l_hold, r_hold;
	l_hold = left;
	r_hold = right;
	pivot = numbers[left];
	while (left < right)
	{
		while ((numbers[right] >= pivot) && (left < right))
			right--;
		if (left != right)
		{
			numbers[left] = numbers[right];
		}
		while ((numbers[left] <= pivot) && (left < right))
			left++;
		if (left != right)
		{
			numbers[right] = numbers[left];
			right--;
		}
	}
	numbers[left] = pivot;
	pivot = left;
	left = l_hold;
	right = r_hold;

	if (left < pivot)
		q_sort(numbers, left, pivot - 1);
	if (right > pivot)
		q_sort(numbers, pivot + 1, right);
}

int main()
{
	int N, K, i, j = 1, k = 1;
	long long 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]);
	}
	quickSort(arr, N);
	for (i = 1; i <= K; i++) {
		if (i % 2 == 1) {
			if (i == 1) {
				temp = arr[N - i];
				result += temp;
			}
			else {
				temp = arr[N - i + k];
				result += temp - prev;
				k++;
			}
		}
		else {
			prev = arr[i - (j + 1)];
			j++;
		}
	}
	printf("%lld", result);
}

컴파일 시 표준 에러 (stderr) 메시지

wine.c: In function 'main':
wine.c:51:14: warning: implicit declaration of function 'malloc' [-Wimplicit-function-declaration]
  arr = (int*)malloc(sizeof(int)*N);
              ^
wine.c:51:14: warning: incompatible implicit declaration of built-in function 'malloc'
wine.c:51:14: note: include '<stdlib.h>' or provide a declaration of 'malloc'
wine.c:50:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &N, &K);
  ^
wine.c:53:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &arr[i]);
   ^

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