QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#869982 | #9314. The Median of the Median of the Median | yueTcheng | WA | 217ms | 27976kb | C++14 | 1.1kb | 2025-01-25 14:15:57 | 2025-01-25 14:16:06 |
Judging History
answer
#include<bits/stdc++.h>
#define N 3011
using namespace std;
int n,a[N],b[N][N],pre[N],tot;
bool check(int mid)
{
for (int i=1;i<=n;i++)
{
pre[i]=0;
for (int j=1;j<=n;j++)b[i][j]=0;
}
for (int i=1;i<=n;i++)pre[i]=pre[i-1]+(a[i]>=mid);
for (int i=1;i<=n;i++)
for (int j=i;j<=n;j++)
if((pre[j]-pre[i-1])*2>=(j-i+2))b[i][j]=1;
for (int i=1;i<=n;i++)
for (int j=i+1;j<=n;j++)
b[i][j]+=b[i][j-1];
for (int j=n;j>=1;j--)
for (int i=j-1;i>=1;i--)
b[i][j]+=b[i+1][j];
tot=0;
for(int i=1;i<=n;i++)
for(int j=i;j<=n;j++)
if(2*b[i][j]>=(j-i+1)*(j-i+2)/2)tot++;
return 2*tot>n*(n+1)/2;
}
void solve()
{
cin>>n;
int l=1e9,r=0,ans=0;
for(int i=1;i<=n;i++)cin>>a[i],l=min(l,a[i]),r=max(r,a[i]);
while(l<=r)
{
int mid=l+r>>1;
if(check(mid))
{
l=mid+1;
ans=mid;
}
else r=mid-1;
}
cout<<ans<<endl;
return ;
}
int main()
{
int T=1;
while(T--)solve();
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 1ms
memory: 3584kb
input:
4 1 3 1 7
output:
1
result:
ok 1 number(s): "1"
Test #2:
score: 0
Accepted
time: 1ms
memory: 3584kb
input:
8 3 3 8 4 5 3 8 5
output:
4
result:
ok 1 number(s): "4"
Test #3:
score: 0
Accepted
time: 184ms
memory: 25992kb
input:
1883 935804604 209383625 842052635 830082014 365721046 29571412 503828250 261878653 304868479 615753663 149387882 137293208 553441715 659054561 809401479 786598486 257715598 738987349 749751119 675212261 214984147 816730618 204108936 529505526 670681192 375128179 445679706 531625791 954119640 739969...
output:
484006473
result:
ok 1 number(s): "484006473"
Test #4:
score: 0
Accepted
time: 209ms
memory: 27952kb
input:
1957 872909724 707949349 490997221 189511043 696381097 482433184 174043836 548201426 788208141 757294560 536411878 361961 65102705 599648900 120639869 620050728 789988994 932102606 540785122 931710164 286821745 583586084 633444407 849735317 780584308 266550416 98570723 722783990 500921667 819344705 ...
output:
516436748
result:
ok 1 number(s): "516436748"
Test #5:
score: 0
Accepted
time: 1ms
memory: 5788kb
input:
178 692096263 317825236 931010188 434850173 52089022 326215531 68436615 315432237 122955263 641096948 348783853 876201150 853561741 370774198 822929299 828427226 546309487 178339038 549855187 410459983 953700209 566391036 649762057 955693969 976755106 277332611 380022551 211888435 42883285 988396877...
output:
593518959
result:
ok 1 number(s): "593518959"
Test #6:
score: 0
Accepted
time: 1ms
memory: 6500kb
input:
173 69392871 816390960 874922071 794279201 87781777 334366903 738652201 601755009 166103436 192703253 735807848 589526799 219998539 16401241 279391882 366912172 228325988 371454295 781080678 111668287 170762000 333246502 638906040 570891055 791690926 463722145 178137760 257822443 589685312 67772391 ...
output:
408439899
result:
ok 1 number(s): "408439899"
Test #7:
score: -100
Wrong Answer
time: 217ms
memory: 27976kb
input:
2000 844787697 717725741 297174490 620713157 869654860 100305714 252182391 350740797 989692676 884515006 283929742 228386094 243395665 931009658 504278816 417368345 996825244 840349536 30435490 464970260 925567493 320798785 588704893 225104969 963755486 262212671 155822732 272322421 979407661 217426...
output:
493944003
result:
wrong answer 1st numbers differ - expected: '493853563', found: '493944003'