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Datatähti 2017 loppu

Start:2017-01-19 12:15:00
End:2017-01-19 17:15:00
 

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CSES - Datatähti 2017 loppu - Results
History
2017-01-19 16:47:5247
2017-01-19 16:36:2823
2017-01-19 16:25:090
2017-01-19 14:30:110
Task:Noitapeli
Sender:fergusq
Submission time:2017-01-19 16:47:52
Language:C++
Status:READY
Score:47

Feedback

groupverdictscore
#1ACCEPTED23
#2ACCEPTED24
#3TIME LIMIT EXCEEDED0

Test results

testverdicttime (s)group
#1ACCEPTED0.04 / 1.001details
#2ACCEPTED0.05 / 1.001details
#3ACCEPTED0.04 / 1.001details
#4ACCEPTED0.04 / 1.001details
#5ACCEPTED0.04 / 1.001details
#6ACCEPTED0.04 / 1.002details
#7ACCEPTED0.04 / 1.002details
#8ACCEPTED0.95 / 1.002details
#9ACCEPTED0.04 / 1.002details
#10ACCEPTED0.05 / 1.002details
#11ACCEPTED0.10 / 1.003details
#12ACCEPTED0.12 / 1.003details
#13TIME LIMIT EXCEEDED-- / 1.003details
#14ACCEPTED0.16 / 1.003details
#15ACCEPTED0.15 / 1.003details

Code

#include <iostream>
#include <algorithm>
#include <set>
using namespace std;

#define max(a, b) (((a)>(b))?(a):(b))
#define min(a, b) (((a)<(b))?(a):(b))

long long nCr(int n, int k) {
  long long a = 1;
  for (int i = n; i > max(k, n-k); i--) {
    a *= i;
  }
  for (int i = 2; i <= min(n-k, k); i++) {
    a /= i;
  }
  return a;
}

int main() {
  int n;
  cin >> n;

  set<int> a[n+1];
  
  long long c = nCr(n, 3);
  //cout << c << "\n";
  for (int i = 1; i <= n; i++) {
    int j;
    cin >> j;
    if (a[i].count(j)>0 && a[j].count(i)>0) continue;
    a[i].insert(j);
    a[j].insert(i);
    set<int> ins;
    ins.insert(a[i].begin(), a[i].end());
    ins.insert(a[j].begin(), a[j].end());
    //cout << n-ins.size() << "\n";
    //for (int i : ins) cout << ": " << i << "\n";
    c -= n-ins.size();
  }
  cout << c << "\n";
}

Test details

Test 1

Group: 1

Verdict: ACCEPTED

input
100
2 1 4 3 6 5 8 7 10 9 12 11 14 ...
view   save

correct output
156800

view   save

user output
156800

view   save

Test 2

Group: 1

Verdict: ACCEPTED

input
100
2 3 4 5 6 7 8 9 10 11 12 13 14...
view   save

correct output
152000

view   save

user output
152000

view   save

Test 3

Group: 1

Verdict: ACCEPTED

input
100
2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...
view   save

correct output
156849

view   save

user output
156849

view   save

Test 4

Group: 1

Verdict: ACCEPTED

input
100
2 3 1 5 6 4 8 9 7 11 12 10 14 ...
view   save

correct output
151968

view   save

user output
151968

view   save

Test 5

Group: 1

Verdict: ACCEPTED

input
100
8 98 100 62 42 36 95 70 22 49 ...
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correct output
152040

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user output
152040

view   save

Test 6

Group: 2

Verdict: ACCEPTED

input
5000
2 1 4 3 6 5 8 7 10 9 12 11 14 ...
view   save

correct output
20808340000

view   save

user output
20808340000

view   save

Test 7

Group: 2

Verdict: ACCEPTED

input
5000
2 3 4 5 6 7 8 9 10 11 12 13 14...
view   save

correct output
20795850000

view   save

user output
20795850000

view   save

Test 8

Group: 2

Verdict: ACCEPTED

input
5000
2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...
view   save

correct output
20808342499

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user output
20808342499

view   save

Test 9

Group: 2

Verdict: ACCEPTED

input
5000
2 3 1 5 6 4 8 9 7 11 12 10 14 ...
view   save

correct output
20795848337

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user output
20795848337

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Test 10

Group: 2

Verdict: ACCEPTED

input
5000
283 2880 2565 3289 4160 936 39...
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correct output
20795852465

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user output
20795852465

view   save

Test 11

Group: 3

Verdict: ACCEPTED

input
100000
2 1 4 3 6 5 8 7 10 9 12 11 14 ...
view   save

correct output
166656666800000

view   save

user output
166656666800000

view   save

Test 12

Group: 3

Verdict: ACCEPTED

input
100000
2 3 4 5 6 7 8 9 10 11 12 13 14...
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correct output
166651667000000

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user output
166651667000000

view   save

Test 13

Group: 3

Verdict: TIME LIMIT EXCEEDED

input
100000
2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...
view   save

correct output
166656666849999

view   save

user output
(empty)

Test 14

Group: 3

Verdict: ACCEPTED

input
100000
2 3 1 5 6 4 8 9 7 11 12 10 14 ...
view   save

correct output
166651666966668

view   save

user output
166651666966668

view   save

Test 15

Group: 3

Verdict: ACCEPTED

input
100000
186 62491 95379 37431 88427 93...
view   save

correct output
166651667250100

view   save

user output
166651667250100

view   save