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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#332418#8242. V-DiagramdownfallWA 79ms3904kbC++17978b2024-02-19 15:23:202024-02-19 15:23:20

Judging History

你现在查看的是最新测评结果

  • [2024-02-19 15:23:20]
  • 评测
  • 测评结果:WA
  • 用时:79ms
  • 内存:3904kb
  • [2024-02-19 15:23:20]
  • 提交

answer

#include<bits/stdc++.h>
#define IOS ios::sync_with_stdio(false),cin.tie(0),cout.tie(0)
#define rep(i,l,r) for(int i=l;i<=r;i++)
#define endl "\n"
#define eb emplace_back
#define int long long
using namespace std;
using ll=long long;
const int N=1e5+3;
int a[N];
void solve()
{
    int n; cin>>n;
    rep(i,1,n) cin>>a[i];
    int sum = 0;
    double ans = 0;
    int pos = 0;
    rep(i,2,n) if(a[i - 1] < a[i]) {pos = i;break;}
    
    rep(i,1,n) sum += a[i];
    ans = max(ans , sum * 1.0 / n);

    sum = 0;
    rep(i,1,pos + 1) sum += a[i];
    ans = max(ans , sum * 1.0 / (pos + 1));

    sum = 0;
    rep(i,pos - 1 ,n) sum += a[i];
    ans = max(ans , sum * 1.0 / (n - pos + 2));

    //cout<<pos<<endl;
    cout<<fixed<<setprecision(20)<<ans<<endl;
}
signed main(){IOS;int T=1;cin>>T;while(T--)solve();} 
/*
1
9
7 5 10 9 8 7 5 6 8

3 1 2 3 4 5 6 7 8 9 10

8
 7 5 1 3 9 11
6/3
9/4
13/5
18/6
24/7
31/8
39/9
48/10
58/11
*/

详细

Test #1:

score: 100
Accepted
time: 0ms
memory: 3672kb

input:

2
4
8 2 7 10
6
9 6 5 3 4 8

output:

6.75000000000000000000
5.83333333333333303727

result:

ok 2 numbers

Test #2:

score: 0
Accepted
time: 79ms
memory: 3904kb

input:

100000
3
948511478 739365502 813471668
3
881046825 27458122 398507422
3
987554257 399092415 924260278
3
984128569 125199021 716360525
3
529589236 45783262 313507287
3
645443456 85994112 226010681
3
914820717 228360911 572267310
3
418958362 56703604 195276041
3
64461646 26764720 26995581
3
914535039 ...

output:

833782882.66666662693023681641
435670789.66666668653488159180
770302316.66666662693023681641
608562705.00000000000000000000
296293261.66666668653488159180
319149416.33333331346511840820
571816312.66666662693023681641
223646002.33333334326744079590
39407315.66666666418313980103
383253737.666666686534...

result:

ok 100000 numbers

Test #3:

score: -100
Wrong Answer
time: 26ms
memory: 3816kb

input:

10000
4
194123849 79274911 191162487 570110764
86
957917218 915359202 914726017 873273226 867724859 867674150 809652204 805531383 745262007 743835491 727071232 714782071 645394643 639432679 594879540 587173904 583418126 560538589 518721836 469558994 427721766 411582333 404948350 402948978 357228675 ...

output:

280182720.66666668653488159180
538557639.95454549789428710938
495489050.35294115543365478516
537734928.64102566242218017578
472025965.69999998807907104492
543693608.25000000000000000000
543366581.51612901687622070312
354696217.50000000000000000000
447343683.31578946113586425781
502458665.38461536169...

result:

wrong answer 1st numbers differ - expected: '258668002.7500000', found: '280182720.6666667', error = '0.0831750'