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QOJ
| ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
|---|---|---|---|---|---|---|---|---|---|
| #716487 | #9353. Interesting Permutation | Xinyoucuo1dui# | WA | 27ms | 4540kb | C++23 | 957b | 2024-11-06 15:23:28 | 2024-11-06 15:23:31 |
Judging History
answer
#include<bits/stdc++.h>
// #pragma GCC optimize("Ofast")
// #pragma GCC optimize("unroll-loops")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
using namespace std;
#define int long long
inline int read(){
int s=0,w=1;
char ch=getchar();
while(ch<'0'||ch>'9'){if(ch=='-')w=-1;ch=getchar();}
while(ch>='0'&&ch<='9') s=s*10+ch-'0',ch=getchar();
return s*w;
}
const int p=1e9+7;
int qp(int x,int y)
{
int res=1;
for(int t=x; y; y>>=1,t=1ll*t*t%p)
if(y&1) res=1ll*res*t%p;
return res;
}
int a[1<<20];
signed main()
{
for(int T=read();T--;)
{
int n=read();
for(int i=1; i<=n; ++i) a[i]=read();
if(a[1]!=0||a[n]!=n-1)
{
puts("0");
continue;
}
int ans=1;
for(int i=2; i<=n; ++i) if(a[i]!=a[i-1])
ans=ans*2%p;
else
{
if((a[i]+1-(i-1))<=0){ans=0;break;}
else ans=ans*(a[i]+1-(i-1))%p;
}
printf("%lld\n",ans);
}
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 3820kb
input:
3 3 0 2 2 3 0 1 2 3 0 2 3
output:
2 4 0
result:
ok 3 lines
Test #2:
score: -100
Wrong Answer
time: 27ms
memory: 4540kb
input:
10039 14 5 6 7 8 9 10 11 12 13 13 13 13 13 13 14 0 5 6 7 8 9 10 11 12 13 14 14 14 14 1 1 14 0 5 4 8 9 10 11 12 13 13 13 13 13 13 45 0 1 1 2 2 3 5 5 6 6 8 9 11 13 15 17 18 18 20 22 22 24 26 26 26 26 27 27 27 28 30 32 32 33 34 34 34 36 36 38 38 38 39 39 44 24 0 2 3 5 7 9 9 10 11 12 13 14 14 14 14 15 1...
output:
0 0 0 30720 0 0 24576 0 0 0 0 0 658159182 0 805306368 8 572589350 12288 2 0 981283070 0 0 2 0 0 0 0 4423680 0 0 14155776 16 0 768 0 0 0 855189487 0 2 0 0 0 0 2 0 2 797370259 0 0 0 0 4 0 0 0 301989888 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 192 0 0 12288 0 0 2 8 0 0 495514526 0 0 955131071 768 0 0 147456...
result:
wrong answer 4th lines differ - expected: '0', found: '30720'