Submission #392175

#	Time	Username	Problem	Language	Result	Execution time	Memory
392175		rainboy	Gondola (IOI14_gondola)	C11	Compilation error	0 ms	0 KiB

gondola

#include "gondola.h"
#include <stdio.h>
#include <string.h>

#define N	100000
#define A	250000
#define MD	1000000009

int max(int a, int b) { return a > b ? a : b; }

int valid(int n, int aa[]) {
	static char used[A + 1];
	int i, j;

	for (i = 0; i < n; i++) {
		if (used[aa[i]])
			return 0;
		used[aa[i]] = 1;
	}
	for (i = 0; i < n; i++)
		if (aa[i] <= n) {
			for (j = 0; j < n; j++)
				if (aa[(i + j) % n] <= n && aa[(i + j) % n] != (aa[i] - 1 + j) % n + 1)
					return 0;
			return 1;
		}
  return 1;
}

int replacement(int n, int aa[], int bb[]) {
	static int ii[A + 1];
	int i, a, a_, b, offset;

	memset(ii, -1, (A + 1) * sizeof *ii);
	offset = 0;
	for (i = 0, a_ = -1; i < n; i++) {
		ii[aa[i]] = i, a_ = max(a_, aa[i]);
		if (aa[i] <= n)
			offset = (aa[i] - 1 - i + n) % n;
	}
	for (a = n + 1, b = (ii[a_] + offset) % n + 1; a <= a_; a++)
		if (a < a_ && ii[a] != -1)
			bb[a - n - 1] = (ii[a] + offset) % n + 1;
		else
			bb[a - n - 1] = b, b = a;
  return a_ - n;
}

unsigned int X = 12345;

int rand_() {
	return (X *= 3) >> 1;
}

int *aa_;

void sort(int *ii, int l, int r) {
	while (l < r) {
		int i = l, j = l, k = r, i_ = ii[l + rand_() % (r - l)], tmp;

		while (j < k)
			if (aa_[ii[j]] == aa_[i_])
				j++;
			else if (aa_[ii[j]] < aa_[i_]) {
				tmp = ii[i], ii[i] = ii[j], ii[j] = tmp;
				i++, j++;
			} else {
				k--;
				tmp = ii[j], ii[j] = ii[k], ii[k] = tmp;
			}
		sort(ii, l, i);
		l = k;
	}
}

long long power(long long a, int k) {
	long long p;

	while (k) {
		if (k & 1)
			p = p * a % MD;
		a = a * a % MD;
		k >>= 1;
	}
	return p;
}

int countReplacement(int n, int aa[]) {
	static int ii[N];
	int i, offset_, ans;

	offset_ = -1;
	for (i = 0; i < n; i++)
		if (aa[i] <= n) {
			int offset = (aa[i] - 1 - i + n) % n;

			if (offset_ != -1 && offset_ != offset)
				return 0;
			offset_ = offset;
		}
	for (i = 0; i < n; i++)
		ii[i] = i;
	aa_ = aa, sort(ii, 0, n);
	for (i = 1; i < n; i++)
		if (aa[ii[i]] == aa[ii[i - 1]])
			return 0;
	ans = 1;
	for (i = n - 1; i >= 0; i--) {
		if (aa[ii[i]] <= n)
			break;
		ans = ans * power(n - i, aa[ii[i]] - (i == 0 ? n : max(aa[ii[i - 1]], n)) - 1) % MD;
	}
	if (offset_ == -1)
		ans = (long long) ans * n % MD;
  return ans;
}

Compilation message (stderr)

gondola.c: In function 'power':
gondola.c:85:9: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
   85 |  return p;
      |         ^
gondola.c: In function 'countReplacement':
gondola.c:111:13: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
  111 |   ans = ans * power(n - i, aa[ii[i]] - (i == 0 ? n : max(aa[ii[i - 1]], n)) - 1) % MD;
      |         ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
grader.c: In function 'main':
grader.c:37:1: error: a label can only be part of a statement and a declaration is not a statement
   37 | int ans =(  countReplacement(n, gondolaSequence));
      | ^~~