Submission #1533289


Source Code Expand

#include<bits/stdc++.h>
using namespace std;
const int md=1e9+7;
int n,c[100005],ans=1;
int main()
{
	scanf("%d",&n);
	for(int i=1,x;i<=n;i++)
	{
		scanf("%d",&x);
		c[x]++;
	}
	for(int i=(n&1)^1;i<n;i+=2)
	{
		if(c[i]!=2-(i==0))
		{
			puts("0");
			return 0;
		}
		ans=ans*c[i]%md;
	}
	printf("%d\n",ans);
	return 0;
}

Submission Info

Submission Time
Task C - Lining Up
User xuyuan
Language C++14 (GCC 5.4.1)
Score 300
Code Size 343 Byte
Status AC
Exec Time 11 ms
Memory 640 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:7:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
                ^
./Main.cpp:10:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&x);
                 ^

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 300 / 300
Status
AC × 3
AC × 14
Set Name Test Cases
Sample sample_01.txt, sample_02.txt, sample_03.txt
All sample_01.txt, sample_02.txt, sample_03.txt, subtask_1_invalid_01.txt, subtask_1_invalid_02.txt, subtask_1_max_01.txt, subtask_1_max_02.txt, subtask_1_max_valid_01.txt, subtask_1_max_valid_02.txt, subtask_1_min_valid_01.txt, subtask_1_rand_01.txt, subtask_1_rand_02.txt, subtask_1_valid_01.txt, subtask_1_valid_02.txt
Case Name Status Exec Time Memory
sample_01.txt AC 1 ms 256 KB
sample_02.txt AC 1 ms 256 KB
sample_03.txt AC 1 ms 256 KB
subtask_1_invalid_01.txt AC 9 ms 512 KB
subtask_1_invalid_02.txt AC 3 ms 256 KB
subtask_1_max_01.txt AC 10 ms 640 KB
subtask_1_max_02.txt AC 10 ms 640 KB
subtask_1_max_valid_01.txt AC 11 ms 640 KB
subtask_1_max_valid_02.txt AC 11 ms 640 KB
subtask_1_min_valid_01.txt AC 1 ms 256 KB
subtask_1_rand_01.txt AC 7 ms 512 KB
subtask_1_rand_02.txt AC 10 ms 640 KB
subtask_1_valid_01.txt AC 6 ms 512 KB
subtask_1_valid_02.txt AC 3 ms 384 KB