QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#353328 | #8050. Random Permutation | ucup-team134 | TL | 1ms | 3768kb | C++17 | 1.2kb | 2024-03-14 02:42:41 | 2024-03-14 02:42:43 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
#define ll long long
const int N=300050;
const int S=550;
const int C=1000;
int p[N],tmp[N],pos[N];
int bal[N],cnt[2*N];
const int M=2*N;
int ls[M],rs[M],tsz,root,sz[M];
void Add(int&c,int ss,int se,int qi,int f){
if(!c)c=++tsz;
sz[c]+=f;
if(ss==se)return;
int mid=ss+se>>1;
if(qi<=mid)Add(ls[c],ss,mid,qi,f);
else Add(rs[c],mid+1,se,qi,f);
}
int Get(int c,int ss,int se,int k){
if(ss==se)return ss;
int mid=ss+se>>1;
if(sz[ls[c]]<k)return Get(rs[c],mid+1,se,k-sz[ls[c]]);
return Get(ls[c],ss,mid,k);
}
int main(){
int n;
scanf("%i",&n);
for(int i=1;i<=n;i++){
scanf("%i",&p[i]);
pos[p[i]]=i;
}
ll ans=0;
for(int j=1;j<S;j++){
for(int i=1;i<=n+j;i++){
if(i-j>=1)Add(root,1,n,p[i-j],-1);
if(i<=n)Add(root,1,n,p[i],1);
if(i>=j && i<=n){
ans+=Get(root,1,n,(j+1)/2);
}
}
}
for(int mid=n/2-C;mid<=n/2+C;mid++){
if(mid>=1 && mid<=n){
for(int i=1;i<=n;i++){
bal[i]=bal[i-1]+(p[i]>mid)-(p[i]<mid);
if(i-S>=0 && i-S<pos[mid])cnt[N+bal[i-S]]++;
if(i>=pos[mid]){
ans+=(ll)(cnt[N+bal[i]]+cnt[N+bal[i]-1])*mid;
}
}
for(int i=0;i<=n;i++)cnt[N+bal[i]]=0;
}
}
printf("%lld\n",ans);
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 1ms
memory: 3768kb
input:
4 1 4 2 3
output:
22
result:
ok 1 number(s): "22"
Test #2:
score: -100
Time Limit Exceeded
input:
100000 56449 21738 74917 44834 36187 96576 37204 28451 3444 13029 66039 8955 51445 30706 27229 37159 66052 16691 70389 29935 44984 3648 75082 73600 76621 28345 5298 37940 49412 85260 92029 18185 84398 10233 79227 98312 96649 30680 65206 38879 75397 26951 11294 58085 37297 97167 59252 44104 4058 3796...