QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#643710 | #365. Railway Trip | QOJ114514ancestor | 0 | 0ms | 15980kb | C++14 | 2.8kb | 2024-10-15 23:17:19 | 2024-10-15 23:17:20 |
Judging History
answer
#include<bits/stdc++.h>
#define N 100005
#define S 20
using namespace std;
int n,k,q,a[N],nxt[N][S],lst[N][S],mxlpos[S][N],mxrpos[S][N],tp,stk[N],lg2[N];
int mxl(int u,int v){
if(u>v)swap(u,v);
if(a[u]<a[v])return v;
return u;
}
int mxr(int u,int v){
if(u>v)swap(u,v);
if(a[u]<=a[v])return v;
return u;
}
int qryl(int l,int r){
int kk=lg2[r-l+1];
return mxl(mxlpos[kk][l],mxlpos[kk][r-(1<<kk)+1]);
}
int qryr(int l,int r){
int kk=lg2[r-l+1];
return mxr(mxrpos[kk][l],mxrpos[kk][r-(1<<kk)+1]);
}
int qlp(int l,int pos){
int ans=0,r=l;
if(l>pos){
ans=114514;
}
if(l<pos){
++ans;
for(int i=S-1;i>=0;i--)
if(max(nxt[l][i],nxt[r][i])<pos){
int tmp=max(nxt[l][i],nxt[r][i]);
l=min(lst[l][i],lst[r][i]),r=tmp,ans+=(1<<i);
}
}
return ans;
}
int qpr(int pos,int r){
int ans=0,l=r;
if(r<pos){
ans=114514;
}
if(r>pos){
++ans;
for(int i=S-1;i>=0;i--)
if(min(lst[l][i],lst[r][i])>pos){
int tmp=min(lst[l][i],lst[r][i]);
r=max(nxt[l][i],nxt[r][i]),l=tmp,ans+=(1<<i);
}
}
return ans;
}
signed main(){
cin.tie(0)->sync_with_stdio(0);
cin>>n>>k>>q;
for(int i=1;i<=n;i++)cin>>a[i],mxlpos[0][i]=mxrpos[0][i]=i;
for(int i=2;i<=n;i++)lg2[i]=lg2[i>>1]+1;
for(int i=1;i<=n;i++){
while(tp&&a[stk[tp]]<=a[i])nxt[stk[tp--]][0]=i;
if(i<n)stk[++tp]=i;
}
nxt[n][0]=n;
for(int i=n;i>=1;i--){
while(tp&&a[stk[tp]]<=a[i])lst[stk[tp--]][0]=i;
if(i>1)stk[++tp]=i;
}
lst[1][0]=1;
// for(int i=1;i<=n;i++)cout<<nxt[i][0]<<' ';cout<<'\n';
// for(int i=1;i<=n;i++)cout<<lst[i][0]<<' ';cout<<'\n';
for(int i=1;(1<<i)<=n;i++)
for(int j=1;j+(1<<i)-1<=n;j++)
mxlpos[i][j]=mxl(mxlpos[i-1][j],mxlpos[i-1][j+(1<<(i-1))]);
for(int i=1;(1<<i)<=n;i++)
for(int j=1;j+(1<<i)-1<=n;j++)
mxrpos[i][j]=mxr(mxrpos[i-1][j],mxrpos[i-1][j+(1<<(i-1))]);
for(int i=1;i<S;i++)
for(int j=1;j<=n;j++)
nxt[j][i]=max(nxt[nxt[j][i-1]][i-1],nxt[lst[j][i-1]][i-1]),
lst[j][i]=min(lst[lst[j][i-1]][i-1],lst[nxt[j][i-1]][i-1]);
for(int i=1,l,r;i<=q;i++){
cin>>l>>r;
if(l>r)swap(l,r);
int pos=qryl(l,r),ans=qlp(l,pos)+qpr(pos,r)-1;
int lpos=lst[qryl(l,r)][0];
if(lpos<l)
ans=min(ans,qpr(lpos,l)+qpr(lpos,r)-1);
int rpos=nxt[qryr(l,r)][0];
if(rpos>r)
ans=min(ans,qlp(l,rpos)+qlp(r,rpos)-1);
if(i==4&&a[2]==85){
cout<<":"<<qlp(l,pos)+qpr(pos,r)-1<<' '<<qpr(lpos,l)+qpr(lpos,r)-1<<' '<<qlp(l,rpos)+qlp(r,rpos)-1<<'\n';
cout<<":"<<lpos<<' '<<l<<' '<<pos<<' '<<r<<' '<<rpos<<'\n';
cout<<":"<<a[lpos]<<' '<<a[l]<<' '<<a[pos]<<' '<<a[r]<<' '<<a[rpos]<<'\n';
cout<<":";
int nw=a[l];
for(int i=l;i<=rpos;i++)if(a[i]>=nw)nw=a[i],cout<<a[i]<<' ';
nw=a[r];
for(int i=r;i<=rpos;i++)if(a[i]>=nw)nw=a[i],cout<<a[i]<<' ';cout<<'\n';
}
cout<<ans<<'\n';
}
return 0;
}
Details
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Subtask #1:
score: 0
Wrong Answer
Test #1:
score: 5
Accepted
time: 0ms
memory: 15980kb
input:
100 100 50 100 86 39 28 49 22 79 14 83 100 15 26 37 51 53 18 74 15 96 72 47 80 10 46 62 88 20 36 46 29 40 28 37 88 91 41 24 63 14 92 24 31 99 61 62 96 94 51 51 21 72 97 59 96 97 94 66 88 32 96 58 26 53 1 100 31 85 30 42 69 40 62 54 94 49 62 13 20 82 74 20 44 54 69 65 34 78 64 48 69 19 35 8 92 100 87...
output:
3 1 3 5 3 3 3 0 2 5 2 6 1 3 1 3 5 5 3 5 4 7 3 6 3 4 4 4 7 0 2 3 2 4 5 5 6 5 5 6 4 3 2 4 5 2 5 4 2 2
result:
ok 50 lines
Test #2:
score: 0
Wrong Answer
time: 0ms
memory: 13836kb
input:
100 100 50 100 85 82 7 50 49 51 45 30 3 29 99 71 93 5 68 70 52 12 44 1 35 99 80 76 34 23 28 62 91 80 77 59 57 30 15 23 13 16 21 58 23 38 49 44 73 7 47 24 53 97 83 14 71 16 75 61 24 17 96 51 41 74 53 25 2 42 36 73 57 53 45 10 12 11 79 68 2 78 44 47 67 21 99 25 68 60 71 23 92 9 2 97 37 43 64 32 28 7 1...
output:
2 0 5 :4 4 3 :1 2 12 75 84 :100 85 99 11 99 :85 99 99 99 11 79 99 3 2 4 2 4 3 5 4 3 3 6 4 4 3 3 3 4 2 3 3 3 4 5 4 2 3 2 5 3 3 4 2 2 3 5 3 6 2 5 4 2 2 4 4 3 4 7
result:
wrong answer 4th lines differ - expected: '4', found: ':4 4 3'
Subtask #2:
score: 0
Skipped
Dependency #1:
0%
Subtask #3:
score: 0
Skipped
Dependency #1:
0%
Subtask #4:
score: 0
Skipped
Dependency #1:
0%