Submission #683968

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
683968	2023-01-19T20:00:48 Z	rainboy	Park (JOI17_park)	C	Compilation error	0 ms	0 KB

park

#include "park.h"
#include <string.h>

const int N = 1400;

int t, n;

int query(int *used, int a, int b) {
	int tmp;
	if (a > b)
		tmp = a, a = b, b = tmp;
	return Ask(a, b, used);
}

void answer(int a, int b) {
	int tmp;
	if (a > b)
		tmp = a, a = b, b = tmp;
	Answer(a, b);
}

int compare(int a, int b) {
	if (a == b)
		return 0;
	if (a == 0)
		return -1;
	if (b == 0)
		return 1;
	int used[N];
	for (int i = 0; i < n; i++)
		used[i] = i != a;
	return query(used, 0, b) ? 1 : -1;
}

void merge(int *ii, int n1, int n2) {
	static int ii_[N];
	int i1 = 0, i2 = 0, i = 0;
	while (i1 < n1 || i2 < n2)
		ii_[i++] = i2 == n2 || i1 < n1 && compare(ii[i1], ii[n1 + i2]) < 0 ? ii[i1++] : ii[n1 + i2++];
	memcpy(ii, ii_, (n1 + n2) * sizeof *ii_);
}

void mergesort(int *ii, int n) {
	if (n == 1)
		return;
	int m = (n + 1) / 2;
	mergesort(ii, m), mergesort(ii + m, n - m);
	merge(ii, m, n - m);
}

void Detect(int t_, int n_) {
	t = t_, n = n_;
	if (t == 1) {
		static int used[N];
		for (int i = 0; i < n; i++)
			for (int j = i + 1; j < n; j++) {
				for (int k = 0; k < n; k++)
					used[k] = k == i || k == j ? 1 : 0;
				if (query(used, i, j))
					answer(i, j);
			}
	} else if (t == 2) {
		static int ii[N];
		for (int i = 0; i < n; i++)
			ii[i] = i;
		mergesort(ii, n);
		for (int h = 1; h < n; h++)
			answer(ii[h - 1], ii[h]);
	}
}

Compilation message

park.c: In function 'merge':
park.c:36:13: error: storage size of 'ii_' isn't constant
   36 |  static int ii_[N];
      |             ^~~
park.c:39:34: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   39 |   ii_[i++] = i2 == n2 || i1 < n1 && compare(ii[i1], ii[n1 + i2]) < 0 ? ii[i1++] : ii[n1 + i2++];
      |                          ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
park.c:36:13: warning: unused variable 'ii_' [-Wunused-variable]
   36 |  static int ii_[N];
      |             ^~~
park.c: In function 'Detect':
park.c:54:14: error: storage size of 'used' isn't constant
   54 |   static int used[N];
      |              ^~~~
park.c:54:14: warning: unused variable 'used' [-Wunused-variable]
park.c:63:14: error: storage size of 'ii' isn't constant
   63 |   static int ii[N];
      |              ^~
park.c:63:14: warning: unused variable 'ii' [-Wunused-variable]