Submission #31558087

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Source Code Expand

#include <stdio.h>

typedef struct {
	int key, id;
} data;

typedef struct {
	data obj[200001];
	int size;
} min_heap;

void push(min_heap* h, data x)
{
	int i = ++(h->size), j = i >> 1;
	data tmp;
	h->obj[i] = x;
	while (j > 0) {
		if (h->obj[i].key < h->obj[j].key) {
			tmp = h->obj[j];
			h->obj[j] = h->obj[i];
			h->obj[i] = tmp;
			i = j;
			j >>= 1;
		} else break;
	}
}

data pop(min_heap* h)
{
	int i = 1, j = 2;
	data output = h->obj[1], tmp;
	h->obj[1] = h->obj[(h->size)--];
	while (j <= h->size) {
		if (j < h->size && h->obj[j^1].key < h->obj[j].key) j ^= 1;
		if (h->obj[j].key < h->obj[i].key) {
			tmp = h->obj[j];
			h->obj[j] = h->obj[i];
			h->obj[i] = tmp;
			i = j;
			j <<= 1;
		} else break;
	}
	return output;
}

int main()
{
	int i, N, P[200001];
	scanf("%d", &N);
	for (i = 1; i <= N; i++) scanf("%d", &(P[i]));
	
	long long ans = 0;
	min_heap h;
	data d;
	h.size = 0;
	for (i = 1; i <= N; i++) {
		if (h.size > 0 && h.obj[1].key < P[i]) {
			d = pop(&h);
			ans += P[i] - d.key;
			if (d.id < 0) {
				d.id = 1;
				push(&h, d);
			}
			d.key = P[i];
			d.id = -1;
			push(&h, d);
		} else {
			d.key = P[i];
			d.id = 1;
			push(&h, d);
		}
	}
	printf("%lld\n", ans);
	fflush(stdout);
	return 0;
}

Submission Info

Compile Error

./Main.c: In function ‘main’:
./Main.c:49:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
   49 |  scanf("%d", &N);
      |  ^~~~~~~~~~~~~~~
./Main.c:50:27: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
   50 |  for (i = 1; i <= N; i++) scanf("%d", &(P[i]));
      |                           ^~~~~~~~~~~~~~~~~~~~

Judge Result