Submission #38699

#	Time	Username	Problem	Language	Result	Execution time	Memory
38699		14kg	Gondola (IOI14_gondola)	C++11	75 / 100	19 ms	4236 KiB

gondola

#include "gondola.h"
#define MOD 1000000009

int n;
int g_num, valid_w[250001], replace_num[100000];
int out_temp[100000];
long long count_tot = 1;

int valid(int _n, int in[]) {
	bool g_check = false;
	
	n = _n;
	for (int i = 0; i < n; i++) {
		if (g_check) {
			g_num = g_num == n ? 1 : g_num + 1;
		}
		if (valid_w[in[i]]) return 0;
		valid_w[in[i]] = i;

		if (in[i] <= n) {
			if (g_check && g_num != in[i]) return 0;
			else if (!g_check) {
				g_check = true, g_num = in[i];
			}
		}
	}
	return 1;
}

int replacement(int _n, int in[], int out[]) {
	int out_len = 0, w, k = _n + 1;
	long long cnt = 0;

	if (!valid(_n, in)) return -1;

	for (int i = 0; i < n; i++) {
		g_num = g_num == n ? 1 : g_num + 1;
		replace_num[i] = g_num;
		if (in[i] > n) cnt++;
	}

	if (cnt == n) count_tot *= (long long)n;
	for (int i = 0; i < n; i++) {
		w = replace_num[i];
		while (k <= in[i]) {
			if (valid_w[k] && valid_w[k] != i) {
				out[out_len++] = replace_num[valid_w[k]];
				k++, cnt--;
			}
			else if (valid_w[k]) {
				out[out_len++] = w;
				w = k++, cnt--;
			}
			else {
				out[out_len++] = w;
				w = k++;
				count_tot *= cnt, count_tot %= MOD;
			}
		}
	} return out_len;
}

int countReplacement(int _n, int in[]) {
	if (replacement(_n, in, out_temp) < 0) return 0;
	return (int)count_tot;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 10 / 10
• Subtask 4: 5 / 5
• Subtask 5: 10 / 10
• Subtask 6: 20 / 20
• Subtask 7: 5 / 5
• Subtask 8: 15 / 15
• Subtask 9: 0 / 15
• Subtask 10: 0 / 10