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ID	Problem	Submitter	Result	Time	Memory	Language	File size	Submit time	Judge time
#903797	#5575. Knight's Tour Redux	Pengzt	AC ✓	8ms	3840kb	C++14	1.7kb	2025-02-17 18:07:36	2025-02-17 18:07:52

Judging History

This is the latest submission verdict.

[2025-02-17 18:07:52]
Judged

Verdict: AC
Time: 8ms
Memory: 3840kb

Show

[2025-02-17 18:07:36]
Submitted

answer

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
#define fi first
#define se second
mt19937_64 eng(time(0) ^ clock());
template <typename T>
T rnd(T l, T r) { return eng() % (r - l + 1) + l; }
const int dx[] = { 1, 1, 3, 3, -1, -1, -3, -3 };
const int dy[] = { 3, -3, 1, -1, 3, -3, 1, -1 };
vector<pii> vec, ans;
bool vsx[15], vsy[15];
bool DFS(int n, int x, int y, int c) {
	if (c == n) {
		ans = vec;
		return 1;
	}
	bool ret = 0;
	for (int i = 0; i < 8; i++) {
		int cx = x + dx[i], cy = y + dy[i];
		if (cx < 1 || cx > n || cy < 1 || cy > n || vsx[cx] || vsy[cy])
			continue;
		vsx[cx] = vsy[cy] = 1;
		vec.emplace_back(cx, cy);
		ret |= DFS(n, cx, cy, c + 1);
		vec.pop_back();
		vsx[cx] = vsy[cy] = 0;
		if (ret)
			return 1;
	}
	return 0;
}
vector<pii> GetF(int n, int x, int y) {
	vsx[x] = vsy[y] = 1;
	vec = vector<pii>{ make_pair(x, y) };
	DFS(n, x, y, 1);
	vsx[x] = vsy[y] = 1;
	return ans;
}
int n;
int main() {
	scanf("%d", &n);
	if (n <= 4) {
		if (n == 1)
			puts("POSSIBLE\n1 1");
		else
			puts("IMPOSSIBLE");
		return 0;
	}
	puts("POSSIBLE");
	if (n == 5) {
		vector<pii> ret = GetF(5, 1, 3);
		for (auto i : ret)
			printf("%d %d\n", i.fi, i.se);
		return 0;
	}
	if (n <= 12) {
		vector<pii> ret = GetF(n, 1, 1);
		for (auto i : ret)
			printf("%d %d\n", i.fi, i.se);
		return 0;
	}
	vector<pii> mv6 = GetF(6, 1, 1);
	int delta = 0;
	while (n > 12) {
		for (auto i : mv6)
			printf("%d %d\n", i.fi + delta, i.se + delta);
		delta += 6;
		n -= 6;
	}
	vector<pii> ret = GetF(n, 1, 1);
	for (auto i : ret)
		printf("%d %d\n", i.fi + delta, i.se + delta);
	return 0;
}

Source code, Language: C++14

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100

Accepted

time: 0ms

memory: 3840kb

input:

output:

POSSIBLE
1 1

result:

ok answer = 1

Test #2:

score: 0

Accepted

time: 0ms

memory: 3840kb

input:

output:

IMPOSSIBLE

result:

ok answer = 0

Test #3:

score: 0

Accepted

time: 0ms

memory: 3840kb

input:

output:

IMPOSSIBLE

result:

ok answer = 0

Test #4:

score: 0

Accepted

time: 0ms

memory: 3840kb

input:

output:

IMPOSSIBLE

result:

ok answer = 0

Test #5:

score: 0

Accepted

time: 1ms

memory: 3840kb

input:

output:

POSSIBLE
1 3
4 4
5 1
2 2
3 5

result:

ok answer = 1

Test #6:

score: 0

Accepted

time: 0ms

memory: 3840kb

input:

output:

POSSIBLE
1 1
2 4
5 5
6 2
3 3
4 6

result:

ok answer = 1

Test #7:

score: 0

Accepted

time: 0ms

memory: 3840kb

input:

output:

POSSIBLE
1 1
2 4
3 7
6 6
7 3
4 2
5 5

result:

ok answer = 1

Test #8:

score: 0

Accepted

time: 0ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #9:

score: 0

Accepted

time: 0ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #10:

score: 0

Accepted

time: 0ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #11:

score: 0

Accepted

time: 1ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #12:

score: 0

Accepted

time: 1ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #13:

score: 0

Accepted

time: 0ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #14:

score: 0

Accepted

time: 0ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #15:

score: 0

Accepted

time: 0ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #16:

score: 0

Accepted

time: 1ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #17:

score: 0

Accepted

time: 0ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #18:

score: 0

Accepted

time: 1ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #19:

score: 0

Accepted

time: 0ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #20:

score: 0

Accepted

time: 0ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #21:

score: 0

Accepted

time: 8ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #22:

score: 0

Accepted

time: 5ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #23:

score: 0

Accepted

time: 8ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #24:

score: 0

Accepted

time: 6ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #25:

score: 0

Accepted

time: 6ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #26:

score: 0

Accepted

time: 8ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #27:

score: 0

Accepted

time: 7ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #28:

score: 0

Accepted

time: 7ms

memory: 3712kb

input:

output:

result:

ok answer = 1

Test #29:

score: 0

Accepted

time: 7ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #30:

score: 0

Accepted

time: 6ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #31:

score: 0

Accepted

time: 7ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #32:

score: 0

Accepted

time: 6ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #33:

score: 0

Accepted

time: 2ms

memory: 3712kb

input:

output:

result:

ok answer = 1

Test #34:

score: 0

Accepted

time: 3ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #35:

score: 0

Accepted

time: 2ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #36:

score: 0

Accepted

time: 2ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #37:

score: 0

Accepted

time: 7ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #38:

score: 0

Accepted

time: 8ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #39:

score: 0

Accepted

time: 0ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #40:

score: 0

Accepted

time: 4ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #41:

score: 0

Accepted

time: 7ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #42:

score: 0

Accepted

time: 5ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #43:

score: 0

Accepted

time: 7ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #44:

score: 0

Accepted

time: 3ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #45:

score: 0

Accepted

time: 2ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #46:

score: 0

Accepted

time: 5ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #47:

score: 0

Accepted

time: 1ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #48:

score: 0

Accepted

time: 6ms

memory: 3712kb

input:

output:

result:

ok answer = 1

Test #49:

score: 0

Accepted

time: 1ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #50:

score: 0

Accepted

time: 6ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #51:

score: 0

Accepted

time: 5ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #52:

score: 0

Accepted

time: 4ms

memory: 3712kb

input:

output:

result:

ok answer = 1

Test #53:

score: 0

Accepted

time: 7ms

memory: 3712kb

input:

output:

result:

ok answer = 1

Test #54:

score: 0

Accepted

time: 4ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #55:

score: 0

Accepted

time: 0ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #56:

score: 0

Accepted

time: 4ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #57:

score: 0

Accepted

time: 3ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #58:

score: 0

Accepted

time: 4ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #59:

score: 0

Accepted

time: 2ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #60:

score: 0

Accepted

time: 2ms

memory: 3712kb

input:

output:

result:

ok answer = 1

Test #61:

score: 0

Accepted

time: 3ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #62:

score: 0

Accepted

time: 2ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #63:

score: 0

Accepted

time: 3ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #64:

score: 0

Accepted

time: 3ms

memory: 3712kb

input:

output:

result:

ok answer = 1

Test #65:

score: 0

Accepted

time: 3ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #66:

score: 0

Accepted

time: 5ms

memory: 3712kb

input:

output:

result:

ok answer = 1

Test #67:

score: 0

Accepted

time: 1ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #68:

score: 0

Accepted

time: 1ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #69:

score: 0

Accepted

time: 7ms

memory: 3712kb

input:

output:

result:

ok answer = 1

Test #70:

score: 0

Accepted

time: 8ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #71:

score: 0

Accepted

time: 0ms

memory: 3840kb

input:

output:

result:

ok answer = 1