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Submission #871671

# Submission time Handle Problem Language Result Execution time Memory
871671 2023-11-11T09:00:38 Z vjudge1 Lutrija (COCI19_lutrija) C++11
42 / 70
 2000 ms 604 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;

vector <int> ans;

int isPrime(ll a) {

	if(a < 2) return 0;
	if(a <= 3) return 1;
	for(int i = 2; i * i <= a; i++) {
		if (a % i == 0) return 0; 
	}
	return 1;
}

void finish() {
	cout << -1;
	exit(0);
}

void ex() {
	exit(0);
}
void check(vector <ll> ans, vector<ll> ans1) {
	
	ll a = ans.back();
	ll b = ans1.back();

	if(a <= 1 || b <= 1) return;
	if(isPrime(abs(a-b))) {

		cout << ans.size() + ans1.size() << "\n";
		for(ll i : ans) cout << i << " ";
		reverse(ans1.begin(), ans1.end());
		for(ll i : ans1) cout << i << " ";
		ex();
	}

	if(isPrime(a-2)) {
		ans.push_back(2);
		check(ans, ans1);
		ans.pop_back();
	}

	if(isPrime(a+2)) {
		ans.push_back(a+2);
		check(ans, ans1);
		ans.pop_back();
	}  

	if(isPrime(b-2)) {
		ans1.push_back(2);
		check(ans, ans1);
		ans1.pop_back();
	}

	if(isPrime(b+2)) {
		ans1.push_back(b+2);
		check(ans, ans1);
		ans1.pop_back();
	}

	return;

}

int main() {

	ll a, b;
	cin >> a >> b;

	if(a % 2 == 0 && b % 2 == 0) finish();

	if(isPrime(abs(a-b))) {
		cout << "2\n" << a << " " << b  << "\n";
		return 0;
	}

	vector <ll> ans, ans1;
	ans.push_back(a);
	ans1.push_back(b);

	check(ans, ans1);
	finish();





	return 0;
}

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 0 ms 348 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 604 KB Output is correct
4 Correct 0 ms 344 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct

Subtask #4
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct

Subtask #5
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct

Subtask #6
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 600 KB Output is correct

Subtask #7
0 / 7.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2043 ms 348 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #8
0 / 7.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2045 ms 348 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #9
0 / 7.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2027 ms 348 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #10
0 / 7.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2021 ms 344 KB Time limit exceeded
2 Halted 0 ms 0 KB -