Submission #105681

#	Time	Username	Problem	Language	Result	Execution time	Memory
105681		luciocf	Sequence (BOI14_sequence)	C++14	34 / 100	366 ms	768 KiB

sequence

#include <bits/stdc++.h>

using namespace std;

const int maxn = 1e5+10;

int n;
int a[maxn];

int brute(void)
{
	for (int j = 1; j <= 1000; j++)
	{
		int v = j;	
		bool deu = 1;

		for (int i = 0; i < n; i++)
		{
			int aux = v;
			bool ok = 0;

			while (aux > 0)
			{
				if (aux%10 == a[i]) ok = 1;
				aux /= 10;
			}

			if (!ok) deu = 0;

			v++;
		}

		if (deu) return j;
	}
	return -1;
}

void solve_9(void)
{
	if (n == 1)
	{
		printf("9\n");
		return;
	}

	for (int i = 2; i <= 20; i++)
	{
		int x = 1;
		for (int j = 1; j <= i; j++)
			x *= 10;

		x--; x /= 9;

		if (x >= n)
		{
			for (int j = 1; j < i; j++)
				printf("8");
			printf("9\n");
			return;
		}
	}
}

int main(void)
{
	scanf("%d", &n);

	for (int i = 0; i < n; i++)
		scanf("%d", &a[i]);

	int first = a[0];
	bool all = 1;

	for (int i = 0; i < n; i++)
		if (a[i] != first)
			all = 0;

	if (!all)
	{
		printf("%d\n", brute());
		return 0;
	}

	if (a[0] == 9)
	{
		solve_9();
		return 0;
	}

	int x = 1;
	for (int i = 0; i <= 20; i++)
	{
		if (a[i] == 0)
		{
			int val = x*10-1;
			val /= 9;

			if (val >= n)
			{
				printf("10");
				for (int j = 1; j <= i; j++) printf("0");
				printf("\n");

				return 0;
			}
		}
		else if (x >= n)
		{
			printf("%d", a[0]);
			for (int j = 1; j <= i; j++) printf("0");
			printf("\n");

			return 0;
		}

		x *= 10;
	}
}

Compilation message (stderr)

sequence.cpp: In function 'int main()':
sequence.cpp:66:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
sequence.cpp:69:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a[i]);
   ~~~~~^~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 0 / 33
• Subtask 3: 25 / 25
• Subtask 4: 0 / 33