ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#185074 | #2380. 中位数 | wosile | 100 | 1323ms | 5872kb | C++ | 767b | 2023-09-21 09:48:07 | 2023-09-21 12:23:28 |
answer
#include<bits/stdc++.h>
#define N (n+n+1)
#define lowbit(x) (x&(-x))
using namespace std;
int n;
int a[300005];
int b[300005];
int c[600005];
void add(int x){
while(x<=N){
c[x]++;
x+=lowbit(x);
}
}
int query(int x){
int sum=0;
while(x){
sum+=c[x];
x-=lowbit(x);
}
return sum;
}
bool check(int x){
b[0]=n+1;
memset(c,0,sizeof(c));
for(int i=1;i<=n;i++)b[i]=b[i-1]+(a[i]>x?-1:1);
long long tot=0;
for(int i=0;i<=n;i++){
tot+=query(b[i]);
add(b[i]);
}
return tot>=(1LL*n*(n+1)/2+1)/2;
}
int main(){
scanf("%d",&n);
for(int i=1;i<=n;i++)scanf("%d",&a[i]);
int L=0,R=1e9+5,ans=1e9+5;
while(L<=R){
int mid=(L+R)/2;
if(check(mid))R=mid-1,ans=mid;
else L=mid+1;
}
printf("%d",ans);
return 0;
}
Details
小提示:点击横条可展开更详细的信息
Test #1:
score: 10
Accepted
time: 0ms
memory: 3544kb
input:
200 247837946 222748444 549404903 934970141 181690491 116150147 755881953 912914845 578004877 589768...
output:
411892743
result:
ok 1 number(s): "411892743"
Test #2:
score: 10
Accepted
time: 3ms
memory: 3540kb
input:
200 504553675 321343511 781936447 172776833 779139954 643752948 106 164 303976944 828799931 11502170...
output:
451369372
result:
ok 1 number(s): "451369372"
Test #3:
score: 10
Accepted
time: 3ms
memory: 3544kb
input:
200 738368650 91602659 340556191 835209882 409442204 656938221 258295858 90658347 126689369 56196859...
output:
420852999
result:
ok 1 number(s): "420852999"
Test #4:
score: 10
Accepted
time: 9ms
memory: 3572kb
input:
5000 300051244 685920750 122806687 315801142 33592358 339985437 262520930 380010194 687330910 550362...
output:
465193387
result:
ok 1 number(s): "465193387"
Test #5:
score: 10
Accepted
time: 9ms
memory: 3576kb
input:
5000 108135249 950186870 146626753 682580494 744412491 4159 995071655 157947560 668940645 878891308 ...
output:
466892796
result:
ok 1 number(s): "466892796"
Test #6:
score: 10
Accepted
time: 4ms
memory: 3572kb
input:
5000 246610103 780664789 678774940 716124165 518453378 300121008 135383319 939869983 430946660 13412...
output:
470507384
result:
ok 1 number(s): "470507384"
Test #7:
score: 10
Accepted
time: 327ms
memory: 5872kb
input:
300000 786856547 380253059 684225515 795392038 881780483 18437791 793783577 832330260 801624996 3466...
output:
463539280
result:
ok 1 number(s): "463539280"
Test #8:
score: 10
Accepted
time: 316ms
memory: 5868kb
input:
300000 951000485 930070933 3566360 157114366 150196488 611226665 123590886 950624066 472150346 57976...
output:
462334620
result:
ok 1 number(s): "462334620"
Test #9:
score: 10
Accepted
time: 323ms
memory: 5872kb
input:
300000 728509094 406128756 696166390 756254976 31403187 672131182 35544213 870708756 3659210 5227553...
output:
464162969
result:
ok 1 number(s): "464162969"
Test #10:
score: 10
Accepted
time: 329ms
memory: 5872kb
input:
300000 804874490 52247250 546638789 400214210 383796618 47995083 814777769 507157584 466189162 28296...
output:
463577194
result:
ok 1 number(s): "463577194"
Extra Test:
score: 0
Extra Test Passed