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ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#99699 | #6352. SPPPSPSS. | tricyzhkx | WA | 2ms | 5712kb | C++14 | 1.5kb | 2023-04-23 15:14:41 | 2023-04-23 15:14:43 |
Judging History
answer
# include <bits/stdc++.h>
using namespace std;
typedef vector<int> vi;
int n,p[1000010],a[1000010];
vi solve()
{
memcpy(a+1,p+1,sizeof(int)*n);
int lim=((n+1)/2)&1?(n+1)/2:(n+1)/2-1;
bool ok=1;
for(int i=1;i<=lim;i++) ok&=(a[i]<=lim);
for(int i=n;i>lim;i--) ok&=(a[i]>lim);
if(ok)
{
int p=lim,q=lim+1;
for(;p && a[p]==p;p--);
for(;q<=n && a[q]==q;q++);
q=n-q+1;
if(p && !(p&1)) p++;
if(q && q&1) q++;
if(max(p,q)<=lim)
{
lim=max(p,q);
vi ans;
for(int i=0;i<lim;i++) ans.push_back(i&1);
return ans;
}
}
sort(a+1,a+lim+1);sort(a+n-lim,a+n+1);
int l1=1,r1=n-lim-1,l2=n-lim,r2=n;
for(;l1<=r1 && a[l1]==l1;l1++);
for(;r2>=l2 && a[r2]==r2;r2--);
for(int i=lim+2;;i++)
if(l1>r1)
{
vi ans;
for(int j=0;j<i-1;j++) ans.push_back(j&1);
return ans;
}
else if(i&1)
{
int L=a[l2]-1,p=l2+min(i-L-(r1-l1+1),r2-l2+1)-1;
while(1)
if(l1<=r1 && a[l1]==L+1) l1++,L++;
else if(l2<=p && a[l2]==L+1) l2++,L++;
else break;
}
else
{
int R=a[r1]+1,p=r1-min(i-(n-R+1)-(r2-l2+1),r1-l1+1)+1;
while(1)
if(l2<=r2 && a[r2]==R-1) r2--,R--;
else if(p<=r1 && a[r1]==R-1) r1--,R--;
else break;
}
return {};
}
int main()
{
cin>>n;
for(int i=1;i<=n;i++) scanf("%d",&p[i]);
vi v1=solve();
reverse(p+1,p+n+1);
for(int i=1;i<=n;i++) p[i]=n-p[i]+1;
vi v2=solve();
if(v2.size()<v1.size())
{
swap(v1,v2);
for(int &i:v1) i^=1;
}
for(int i:v1) printf("%c","PS"[i]);
return puts("."),0;
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 5504kb
input:
3 1 2 3
output:
.
result:
ok OK 0 operations
Test #2:
score: 0
Accepted
time: 2ms
memory: 5712kb
input:
2 2 1
output:
PS.
result:
ok OK 2 operations
Test #3:
score: 0
Accepted
time: 2ms
memory: 5656kb
input:
9 3 2 4 1 5 6 7 9 8
output:
SPSP.
result:
ok OK 4 operations
Test #4:
score: 0
Accepted
time: 2ms
memory: 5652kb
input:
10 2 9 5 7 10 6 3 1 8 4
output:
PSPSPSPS.
result:
ok OK 8 operations
Test #5:
score: 0
Accepted
time: 0ms
memory: 5624kb
input:
13 9 8 5 4 3 2 1 13 12 11 10 7 6
output:
PSPSPSPS.
result:
ok OK 8 operations
Test #6:
score: -100
Wrong Answer
time: 2ms
memory: 5660kb
input:
20 17 6 15 14 4 10 18 7 13 8 2 12 1 19 20 3 11 16 5 9
output:
SPSPSPSPSPSPSPSP.
result:
wrong answer Jury (14) found answer better than participant (16)