QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#489330 | #7956. Walk Swapping | arnold518 | WA | 0ms | 4112kb | C++17 | 2.6kb | 2024-07-24 19:32:33 | 2024-07-24 19:32:33 |
Judging History
answer
#pragma GCC optimize ("Ofast")
#pragma GCC optimize ("unroll-loops")
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const int MAXN = 6000;
const int INF = 1e9;
int N, A[MAXN+10], B[MAXN+10], ans=INF;
int Z1[MAXN+10], Z2[MAXN+10];
vector<int> getZ(vector<int> S)
{
int N=S.size();
S.insert(S.begin(), 0);
vector<int> Z(N+1);
int pos=1;
for(int i=2; i<=N; i++)
{
if(i<=pos+Z[pos]-1) Z[i]=min(pos+Z[pos]-i, Z[i-pos+1]);
while(i+Z[i]<=N && S[i+Z[i]]==S[Z[i]+1]) Z[i]++;
if(Z[pos]+pos<Z[i]+i) pos=i;
}
Z.erase(Z.begin());
return Z;
}
void solve()
{
for(int cyc=0; cyc<N; cyc++)
{
for(int i=1; i<=N; i++) B[i+N]=B[i];
vector<int> V;
for(int i=2; i<=N; i++) V.push_back(A[i]);
V.push_back(-1);
for(int i=1; i<=N+N; i++) V.push_back(B[i]);
V=getZ(V);
for(int i=1; i<=N+N; i++) Z1[i]=V[i-1+N];
V.clear();
for(int i=N; i>=2; i--) V.push_back(A[i]);
V.push_back(-1);
for(int i=N+N; i>=1; i--) V.push_back(B[i]);
V=getZ(V);
for(int i=1; i<=N+N; i++) Z2[i]=V[3*N-i];
for(int i=N; i<=N+N; i++)
{
int a=Z2[i], b=Z1[i+1];
int l=max(0, N-1-a), r=min(b, N-1);
if(l<=r) ans=min(ans, l+(N-1)*(N+N-i));
}
for(int i=0; i<=N; i++)
{
int a=Z2[i], b=Z1[i+1];
int l=max(0, N-1-b), r=min(a, N-1);
if(l<=r) ans=min(ans, (N-1)*(N+1-i)-r);
}
for(int i=0; i<=N; i++)
{
int a=Z2[i], b=Z1[i+1];
int l=max(0, N-1-a), r=min(b, N-1);
if(l<=r) ans=min(ans, N*(i-1)+N+l-i);
}
for(int i=N; i<=N+N; i++)
{
int a=Z2[i], b=Z1[i+1];
int l=max(0, N-1-b), r=min(a, N-1);
if(l<=r) ans=min(ans, N*(i-N)+N+N-1-i-r);
}
rotate(A+1, A+2, A+N+1);
rotate(B+1, B+2, B+N+1);
}
}
int main()
{
ios_base::sync_with_stdio(false); cin.tie(NULL);
scanf("%d", &N);
for(int i=1; i<=N; i++) scanf("%d", &A[i]);
for(int i=1; i<=N; i++) scanf("%d", &B[i]);
{
vector<int> VA, VB;
for(int i=1; i<=N; i++) VA.push_back(A[i]);
for(int i=1; i<=N; i++) VB.push_back(B[i]);
sort(VA.begin(), VA.end());
sort(VB.begin(), VB.end());
if(VA!=VB) return !printf("-1\n");
}
if(N==1) return !printf("0\n");
solve();
if(ans==INF) ans=-1;
printf("%d\n", ans);
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 3780kb
input:
4 4 3 2 1 3 4 2 1
output:
1
result:
ok single line: '1'
Test #2:
score: 0
Accepted
time: 0ms
memory: 3776kb
input:
6 2 1 1 2 2 1 1 2 2 2 1 1
output:
7
result:
ok single line: '7'
Test #3:
score: 0
Accepted
time: 0ms
memory: 3824kb
input:
6 4 1 3 6 2 5 6 2 1 3 4 5
output:
-1
result:
ok single line: '-1'
Test #4:
score: -100
Wrong Answer
time: 0ms
memory: 4112kb
input:
4 1 2 3 4 4 2 1 3
output:
4
result:
wrong answer 1st lines differ - expected: '2', found: '4'