Submission #20,470

20470

2026-01-07 05:56:29

cpp17

Accepted 40/40

1ms

500 KiB


#include <iostream>

int main()
{
    int N;
    std::cin >> N;
    int a = 1;
    int b = 2;
    int c = 5;
    if (N == 1) std::cout << a;
    else
        if (N == 2) std::cout << b;
        else
            if (N == 3) std::cout << c;
            else {
                for (int i = 4; i <= N; i++) {
                    int seged = 2 * c + a;
                    a = b;
                    b = c;
                    c = seged;
                }
                std::cout << c;
            }
}

	Sum	Test	Verdict		Time	Memory
base	40/40
		1	Accepted	0/0	1ms	316 KiB
		2	Accepted	0/0	1ms	316 KiB
		3	Accepted	2/2	1ms	316 KiB
		4	Accepted	2/2	1ms	316 KiB
		5	Accepted	2/2	1ms	316 KiB
		6	Accepted	2/2	1ms	316 KiB
		7	Accepted	2/2	1ms	316 KiB
		8	Accepted	3/3	1ms	316 KiB
		9	Accepted	3/3	1ms	316 KiB
		10	Accepted	3/3	1ms	500 KiB
		11	Accepted	3/3	1ms	316 KiB
		12	Accepted	3/3	1ms	316 KiB
		13	Accepted	3/3	1ms	316 KiB
		14	Accepted	3/3	1ms	316 KiB
		15	Accepted	3/3	1ms	316 KiB
		16	Accepted	3/3	1ms	316 KiB
		17	Accepted	3/3	1ms	316 KiB