#include<bits/stdc++.h>
using namespace std;
#define all(fl) fl.begin(),fl.end()
#define pb push_back
#define fi first
#define se second
#define for1(i,j,k) for(int i=j;i<=k;i++)
#define for2(i,j,k) for(int i=j;i>=k;i--)
#define for3(i,j,k,l) for(int i=j;i<=k;i+=l)
#define lb lower_bound
#define ub upper_bound
#define sz(a) (int)a.size()
#define pii pair<int,int>
#define pli pair<long long,int>
#define gcd __gcd
#define lcm(x,y) x*y/__gcd(x,y)
const int maxn=5e5+9;
struct IT_max{
vector<int>st,lazy;
void resz(int n){
st.clear(),lazy.clear();
st.resize(4*n+9);
lazy.resize(4*n+9);
}
void push(int id){
if (lazy[id]){
st[id<<1]+=lazy[id];
st[id<<1|1]+=lazy[id];
lazy[id<<1]+=lazy[id];
lazy[id<<1|1]+=lazy[id];
lazy[id]=0;
}
}
void update(int id,int l,int r,int u,int v,int val){
if (l>v||r<u||u>v)return;
if (u<=l&&r<=v){
st[id]+=val;
lazy[id]+=val;
return;
}
push(id);
int mid=(l+r)>>1;
update(id<<1,l,mid,u,v,val);
update(id<<1|1,mid+1,r,u,v,val);
st[id]=max(st[id<<1],st[id<<1|1]);
}
int get(int id,int l,int r,int u,int v){
if (l>v||r<u||u>v)return -maxn;
if (u<=l&&r<=v)return st[id];
push(id);
int mid=(l+r)>>1;
return max(get(id<<1,l,mid,u,v),get(id<<1|1,mid+1,r,u,v));
}
};
struct IT_min{
vector<int>st,lazy;
void resz(int n){
st.clear(),lazy.clear();
st.resize(4*n+9);
lazy.resize(4*n+9);
}
void push(int id){
if (lazy[id]){
st[id<<1]+=lazy[id];
st[id<<1|1]+=lazy[id];
lazy[id<<1]+=lazy[id];
lazy[id<<1|1]+=lazy[id];
lazy[id]=0;
}
}
void update(int id,int l,int r,int u,int v,int val){
if (l>v||r<u||u>v)return;
if (u<=l&&r<=v){
st[id]+=val;
lazy[id]+=val;
return;
}
push(id);
int mid=(l+r)>>1;
update(id<<1,l,mid,u,v,val);
update(id<<1|1,mid+1,r,u,v,val);
st[id]=min(st[id<<1],st[id<<1|1]);
}
int get(int id,int l,int r,int u,int v){
if (l>v||r<u||u>v)return maxn;
if (u<=l&&r<=v)return st[id];
push(id);
int mid=(l+r)>>1;
return min(get(id<<1,l,mid,u,v),get(id<<1|1,mid+1,r,u,v));
}
};
int n;
int a[maxn];
vector<int>value[maxn];
int mx_l[maxn],mn_l[maxn],mn_r[maxn],mx_r[maxn];
int pf[maxn];
void pre(){
IT_max st1;
IT_min st2;
st1.resz(n),st2.resz(n);
auto up=[&](int id,int val){
st1.update(1,1,n,id,n,val);
st2.update(1,1,n,id,n,val);
};
for1(i,1,n)up(i,-1);
for1(i,1,n){
for (auto v:value[i]){
up(v,2);
}
for (auto v:value[i]){
pf[v]=st1.get(1,1,n,v,v);
}
for1(j,0,sz(value[i])-1){
int v=value[i][j];
if (j==0)mx_l[v]=st1.get(1,1,n,1,v)-pf[v],mn_l[v]=st2.get(1,1,n,1,v)-pf[v];
else mx_l[v]=st1.get(1,1,n,value[i][j-1]+1,v)-pf[v],mn_l[v]=st2.get(1,1,n,value[i][j-1]+1,v)-pf[v];
}
}
st1.resz(n),st2.resz(n);
auto rup=[&](int id,int val){
st1.update(1,1,n,1,id,val);
st2.update(1,1,n,1,id,val);
};
for1(i,1,n)rup(i,-1);
for1(i,1,n){
for (auto v:value[i])rup(v,-1);
for1(j,0,sz(value[i])-1){
int v=value[i][j];
int suffix=st1.get(1,1,n,v,v);
if (j==sz(value[i])-1){
mx_r[v]=st1.get(1,1,n,v,n)-suffix,mn_r[v]=st2.get(1,1,n,v,n)-suffix;
}
else {
mx_r[v]=st1.get(1,1,n,v,value[i][j+1]-1)-suffix,mn_r[v]=st2.get(1,1,n,v,value[i][j+1]-1)-suffix;
}
}
}
}
int sequence(int N, std::vector<int> A) {
n=N;
for1(i,1,n)a[i]=A[i-1];
for1(i,1,n)value[a[i]].pb(i);
int ans=0;
pre();
for1(i,1,n){
for1(x,0,sz(value[i])-1){
for1(y,0,x){
int l1=value[i][y],r1=value[i][x];
int sum=pf[r1]-pf[l1]+1;
if (sum+mx_l[l1]+mx_r[r1]<0)continue;
if (sum+mn_l[l1]+mn_r[r1]>x-y+1)continue;
ans=max(ans,x-y+1);
}
}
}
return ans;
}
/*signed main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
//freopen(".INP","r",stdin);
//freopen(".OUT","w",stdout);
int N;
assert(1 == scanf("%d", &N));
std::vector<int> A(N);
for (int i = 0; i < N; ++i) {
assert(1 == scanf("%d", &A[i]));
}
int result = sequence(N, A);
printf("%d\n", result);
return 0;
}*/
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
6 ms |
22872 KB |
Output is correct |
2 |
Correct |
6 ms |
22876 KB |
Output is correct |
3 |
Correct |
6 ms |
22876 KB |
Output is correct |
4 |
Correct |
7 ms |
22984 KB |
Output is correct |
5 |
Incorrect |
7 ms |
22876 KB |
Output isn't correct |
6 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
6 ms |
22872 KB |
Output is correct |
2 |
Correct |
6 ms |
22876 KB |
Output is correct |
3 |
Correct |
6 ms |
22876 KB |
Output is correct |
4 |
Correct |
7 ms |
22984 KB |
Output is correct |
5 |
Incorrect |
7 ms |
22876 KB |
Output isn't correct |
6 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
6 ms |
22872 KB |
Output is correct |
2 |
Correct |
1231 ms |
72560 KB |
Output is correct |
3 |
Correct |
1281 ms |
72476 KB |
Output is correct |
4 |
Execution timed out |
2059 ms |
62304 KB |
Time limit exceeded |
5 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
6 ms |
22876 KB |
Output is correct |
2 |
Execution timed out |
2004 ms |
62372 KB |
Time limit exceeded |
3 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1639 ms |
78200 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
6 ms |
22872 KB |
Output is correct |
2 |
Correct |
6 ms |
22876 KB |
Output is correct |
3 |
Correct |
6 ms |
22876 KB |
Output is correct |
4 |
Correct |
7 ms |
22984 KB |
Output is correct |
5 |
Incorrect |
7 ms |
22876 KB |
Output isn't correct |
6 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
6 ms |
22872 KB |
Output is correct |
2 |
Correct |
6 ms |
22876 KB |
Output is correct |
3 |
Correct |
6 ms |
22876 KB |
Output is correct |
4 |
Correct |
7 ms |
22984 KB |
Output is correct |
5 |
Incorrect |
7 ms |
22876 KB |
Output isn't correct |
6 |
Halted |
0 ms |
0 KB |
- |