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QOJ
ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#344061 | #7778. Turning Permutation | hl666 | WA | 0ms | 4024kb | C++17 | 1.9kb | 2024-03-03 14:54:46 | 2024-03-03 14:54:47 |
Judging History
answer
#include<cstdio>
#include<iostream>
#include<cstring>
#define int long long
#define RI register int
#define CI const int&
using namespace std;
const int N=55;
int n,k,a[N],cs[N],pos[N],f[N][N][2]; // 0: i-1 on i's left; 1: i-1 on i's right
inline int calc(void)
{
RI i,j,k,tp; memset(f,0,sizeof(f)); int len=0;
if (cs[1]&&cs[2])
{
if (pos[1]<pos[2]) f[2][0][0]=1; else f[2][0][1]=1;
} else if (cs[1]&&!cs[2]) len=1,f[2][1][0]=1;
else if (!cs[1]&&cs[2]) len=1,f[2][0][1]=1;
else len=2,f[2][1][1]=f[2][2][0]=1;
for (i=2;i<n;++i)
{
if (cs[i+1])
{
if (cs[i])
{
if (pos[i+1]<pos[i]) f[i+1][0][1]=f[i][0][0];
else f[i+1][0][0]=f[i][0][1];
} else
{
for (j=1;j<=len;++j) f[i+1][0][1]+=f[i][j][0];
}
continue;
}
for (j=0;j<=len;++j)
{
for (tp=0;tp<2;++tp) if (f[i][j][tp])
{
if (tp==0)
{
for (k=1;k<=j;++k) f[i+1][k][1]+=f[i][j][tp];
} else
{
for (k=j+1;k<=len+1;++k) f[i+1][k][0]+=f[i][j][tp];
}
}
}
++len;
}
int ret=0; for (i=1;i<=len;++i) ret+=f[n][i][0]+f[n][i][1]; return ret;
}
signed main()
{
RI p,v,i; for (scanf("%lld%lld",&n,&k),p=1;p<n;++p)
{
int filled=-1;
for (v=1;v<=n;++v) if (!cs[v])
{
cs[v]=1; a[p]=v; pos[v]=p;
for (i=1;i<=n;++i) if (!cs[i]) pos[i]=p+1;
bool flag=1; for (i=2;i<=n;++i)
if ((pos[i]-pos[i-1])*(pos[i]-pos[i+1])<0) { flag=0; break; }
if (!flag) continue; int tmp=calc();
if (tmp>=k) { filled=v; break; } else k-=tmp,cs[v]=0;
}
if (filled==-1) return puts("-1"),0; else a[p]=filled;
}
for (i=1;i<=n;++i) if (!cs[i]) a[n]=i;
for (i=1;i<=n;++i) printf("%lld ",a[i]);
return 0;
}
详细
Test #1:
score: 100
Accepted
time: 0ms
memory: 3892kb
input:
3 2
output:
2 1 3
result:
ok 3 number(s): "2 1 3"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3792kb
input:
3 5
output:
-1
result:
ok 1 number(s): "-1"
Test #3:
score: 0
Accepted
time: 0ms
memory: 4024kb
input:
4 6
output:
3 1 2 4
result:
ok 4 number(s): "3 1 2 4"
Test #4:
score: 0
Accepted
time: 0ms
memory: 3712kb
input:
4 11
output:
-1
result:
ok 1 number(s): "-1"
Test #5:
score: -100
Wrong Answer
time: 0ms
memory: 3836kb
input:
3 1
output:
-1
result:
wrong answer 1st numbers differ - expected: '1', found: '-1'