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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 14:46:2647
2017-01-19 14:43:480
2017-01-19 14:41:540
Task:Noitapeli
Sender:mangolassi
Submission time:2017-01-19 14:46:26
Language:C++
Status:READY
Score:47

Feedback

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

Test results

testverdicttime (s)group
#1ACCEPTED0.04 / 1.001details
#2ACCEPTED0.03 / 1.001details
#3ACCEPTED0.04 / 1.001details
#4ACCEPTED0.02 / 1.001details
#5ACCEPTED0.03 / 1.001details
#6ACCEPTED0.08 / 1.002details
#7ACCEPTED0.11 / 1.002details
#8ACCEPTED0.07 / 1.002details
#9ACCEPTED0.08 / 1.002details
#10ACCEPTED0.09 / 1.002details
#11TIME LIMIT EXCEEDED-- / 1.003details
#12TIME LIMIT EXCEEDED-- / 1.003details
#13TIME LIMIT EXCEEDED-- / 1.003details
#14TIME LIMIT EXCEEDED-- / 1.003details
#15TIME LIMIT EXCEEDED-- / 1.003details

Code

#include <iostream>

const int N = 1e5;
int target[N];
int ins[N];

int main() {
	std::ios_base::sync_with_stdio(false);
	std::cin.tie(0);

	int n;
	std::cin >> n;

	int t;
	for (int i = 0; i < n; ++i) {
		std::cin >> t;
		--t;
		target[i] = t;
		++ins[t];
	}
	long long ways = 0;
	for (int a = 0; a < n; ++a) {
		for (int b = a+1; b < n; ++b) {
			if (target[a] == b || target[b] == a) { continue; }
			int others = n - 2 - ins[a] - ins[b];
			int first = target[target[a]];
			if (first != a && first != b) {
				--others;
			}
			int second = target[target[b]];
			if ((target[a] != target[b]) && (second != a && second != b)) {
				--others;
			}
			ways += others;
		}
	}
	ways /= 3;
	std::cout << (ways < 0 ? 0 : ways) << "\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

view   save

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

view   save

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

view   save

user output
20795848337

view   save

Test 10

Group: 2

Verdict: ACCEPTED

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

view   save

user output
20795852465

view   save

Test 11

Group: 3

Verdict: TIME LIMIT EXCEEDED

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

correct output
166656666800000

view   save

user output
(empty)

Test 12

Group: 3

Verdict: TIME LIMIT EXCEEDED

input
100000
2 3 4 5 6 7 8 9 10 11 12 13 14...
view   save

correct output
166651667000000

view   save

user output
(empty)

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: TIME LIMIT EXCEEDED

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

correct output
166651666966668

view   save

user output
(empty)

Test 15

Group: 3

Verdict: TIME LIMIT EXCEEDED

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

correct output
166651667250100

view   save

user output
(empty)