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ID	Problem	Submitter	Result	Time	Memory	Language	File size	Submit time	Judge time
#344772	#5575. Knight's Tour Redux	Meatherm	AC ✓	10ms	4264kb	C++14	1.5kb	2024-03-05 09:46:09	2024-03-05 09:46:09

Judging History

你现在查看的是最新测评结果

[2024-03-05 09:46:09]
评测

测评结果：AC
用时：10ms
内存：4264kb

查看

[2024-03-05 09:46:09]
提交

answer

# include <bits/stdc++.h>

const int N=100010,INF=0x3f3f3f3f;

inline int read(void){
	int res,f=1;
	char c;
	while((c=getchar())<'0'||c>'9')
		if(c=='-') f=-1;
	res=c-48;
	while((c=getchar())>='0'&&c<='9')
		res=res*10+c-48;
	return res*f;
}

int dx[8]={-3,-3,-1,1,1,1,3,3};
int dy[8]={-1,1,-3,3,-3,3,-1,1};

int n;

bool l[N],c[N];

std::vector <std::pair <int,int> > d,ans,seq;

inline void ins(int x,int y){
	seq.push_back(std::make_pair(x,y));
	return;
}

void dfs(int x,int y,int dep){
	l[x]=c[y]=true,d.push_back(std::make_pair(x,y));
	
	if(dep==n){
		ans=d;//,printf("POSSIBLE! d = %llu",d.size());
		goto END;
	}
	
	for(int k=0;k<8;++k){
		int tx=x+dx[k],ty=y+dy[k];
		if(tx<1||tx>n||ty<1||ty>n||l[tx]||c[ty]) continue;
		dfs(tx,ty,dep+1);
	}
	
	END:
	l[x]=c[y]=false,d.pop_back();
	return;
}

inline void pr(void){
	puts("POSSIBLE");
	for(auto v:seq) printf("%d %d\n",v.first,v.second);
	
	exit(0);
	
	return;
}


inline void solve(int d){
	if(n-d>=12){
		if(!d) ins(d+1,d+1);
		
		ins(d+4,d+2),ins(d+5,d+5),ins(d+2,d+6),ins(d+3,d+3),ins(d+6,d+4),ins(d+7,d+7);
		solve(d+6);
	}else{
		n=n-d;
		dfs(1,1,1);
		for(auto v:ans) if(v.first!=1||d==0) ins(d+v.first,d+v.second);
		pr();
	}
	return;
}

int main(void){
	n=read();
	
	if(n==1) ins(1,1),pr();
	else if(2<=n&&n<5) puts("IMPOSSIBLE"),exit(0);
	else if(n==5){
		ins(1,3),ins(4,2),ins(5,5),ins(2,4),ins(3,1);
		pr();
	}solve(0);



	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: 3836kb

input:

output:

POSSIBLE
1 1

result:

ok answer = 1

Test #2:

score: 0

Accepted

time: 1ms

memory: 3632kb

input:

output:

IMPOSSIBLE

result:

ok answer = 0

Test #3:

score: 0

Accepted

time: 1ms

memory: 3644kb

input:

output:

IMPOSSIBLE

result:

ok answer = 0

Test #4:

score: 0

Accepted

time: 1ms

memory: 3552kb

input:

output:

IMPOSSIBLE

result:

ok answer = 0

Test #5:

score: 0

Accepted

time: 0ms

memory: 3800kb

input:

output:

POSSIBLE
1 3
4 2
5 5
2 4
3 1

result:

ok answer = 1

Test #6:

score: 0

Accepted

time: 0ms

memory: 3760kb

input:

output:

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

result:

ok answer = 1

Test #7:

score: 0

Accepted

time: 1ms

memory: 3760kb

input:

output:

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

result:

ok answer = 1

Test #8:

score: 0

Accepted

time: 1ms

memory: 3936kb

input:

output:

result:

ok answer = 1

Test #9:

score: 0

Accepted

time: 1ms

memory: 3836kb

input:

output:

result:

ok answer = 1

Test #10:

score: 0

Accepted

time: 1ms

memory: 3936kb

input:

output:

result:

ok answer = 1

Test #11:

score: 0

Accepted

time: 0ms

memory: 3840kb

input:

output:

result:

ok answer = 1

Test #12:

score: 0

Accepted

time: 0ms

memory: 3932kb

input:

output:

result:

ok answer = 1

Test #13:

score: 0

Accepted

time: 0ms

memory: 3884kb

input:

output:

result:

ok answer = 1

Test #14:

score: 0

Accepted

time: 0ms

memory: 3832kb

input:

output:

result:

ok answer = 1

Test #15:

score: 0

Accepted

time: 0ms

memory: 3880kb

input:

output:

result:

ok answer = 1

Test #16:

score: 0

Accepted

time: 0ms

memory: 3864kb

input:

output:

result:

ok answer = 1

Test #17:

score: 0

Accepted

time: 0ms

memory: 3796kb

input:

output:

result:

ok answer = 1

Test #18:

score: 0

Accepted

time: 0ms

memory: 3764kb

input:

output:

result:

ok answer = 1

Test #19:

score: 0

Accepted

time: 0ms

memory: 3936kb

input:

output:

result:

ok answer = 1

Test #20:

score: 0

Accepted

time: 0ms

memory: 3776kb

input:

output:

result:

ok answer = 1

Test #21:

score: 0

Accepted

time: 9ms

memory: 4156kb

input:

output:

result:

ok answer = 1

Test #22:

score: 0

Accepted

time: 9ms

memory: 4072kb

input:

output:

result:

ok answer = 1

Test #23:

score: 0

Accepted

time: 6ms

memory: 4132kb

input:

output:

result:

ok answer = 1

Test #24:

score: 0

Accepted

time: 9ms

memory: 4160kb

input:

output:

result:

ok answer = 1

Test #25:

score: 0

Accepted

time: 10ms

memory: 4136kb

input:

output:

result:

ok answer = 1

Test #26:

score: 0

Accepted

time: 9ms

memory: 4204kb

input:

output:

result:

ok answer = 1

Test #27:

score: 0

Accepted

time: 9ms

memory: 4164kb

input:

output:

result:

ok answer = 1

Test #28:

score: 0

Accepted

time: 9ms

memory: 4164kb

input:

output:

result:

ok answer = 1

Test #29:

score: 0

Accepted

time: 9ms

memory: 4148kb

input:

output:

result:

ok answer = 1

Test #30:

score: 0

Accepted

time: 9ms

memory: 4148kb

input:

output:

result:

ok answer = 1

Test #31:

score: 0

Accepted

time: 9ms

memory: 4048kb

input:

output:

result:

ok answer = 1

Test #32:

score: 0

Accepted

time: 8ms

memory: 4264kb

input:

output:

result:

ok answer = 1

Test #33:

score: 0

Accepted

time: 3ms

memory: 3976kb

input:

output:

result:

ok answer = 1

Test #34:

score: 0

Accepted

time: 4ms

memory: 3904kb

input:

output:

result:

ok answer = 1

Test #35:

score: 0

Accepted

time: 4ms

memory: 3896kb

input:

output:

result:

ok answer = 1

Test #36:

score: 0

Accepted

time: 4ms

memory: 3928kb

input:

output:

result:

ok answer = 1

Test #37:

score: 0

Accepted

time: 4ms

memory: 4120kb

input:

output:

result:

ok answer = 1

Test #38:

score: 0

Accepted

time: 9ms

memory: 4152kb

input:

output:

result:

ok answer = 1

Test #39:

score: 0

Accepted

time: 1ms

memory: 3856kb

input:

output:

result:

ok answer = 1

Test #40:

score: 0

Accepted

time: 5ms

memory: 3888kb

input:

output:

result:

ok answer = 1

Test #41:

score: 0

Accepted

time: 10ms

memory: 4124kb

input:

output:

result:

ok answer = 1

Test #42:

score: 0

Accepted

time: 8ms

memory: 4164kb

input:

output:

result:

ok answer = 1

Test #43:

score: 0

Accepted

time: 8ms

memory: 4136kb

input:

output:

result:

ok answer = 1

Test #44:

score: 0

Accepted

time: 6ms

memory: 3984kb

input:

output:

result:

ok answer = 1

Test #45:

score: 0

Accepted

time: 1ms

memory: 3972kb

input:

output:

result:

ok answer = 1

Test #46:

score: 0

Accepted

time: 2ms

memory: 4056kb

input:

output:

result:

ok answer = 1

Test #47:

score: 0

Accepted

time: 0ms

memory: 3988kb

input:

output:

result:

ok answer = 1

Test #48:

score: 0

Accepted

time: 3ms

memory: 4072kb

input:

output:

result:

ok answer = 1

Test #49:

score: 0

Accepted

time: 1ms

memory: 3968kb

input:

output:

result:

ok answer = 1

Test #50:

score: 0

Accepted

time: 3ms

memory: 4156kb

input:

output:

result:

ok answer = 1

Test #51:

score: 0

Accepted

time: 3ms

memory: 3920kb

input:

output:

result:

ok answer = 1

Test #52:

score: 0

Accepted

time: 7ms

memory: 4100kb

input:

output:

result:

ok answer = 1

Test #53:

score: 0

Accepted

time: 4ms

memory: 4128kb

input:

output:

result:

ok answer = 1

Test #54:

score: 0

Accepted

time: 7ms

memory: 4132kb

input:

output:

result:

ok answer = 1

Test #55:

score: 0

Accepted

time: 2ms

memory: 3884kb

input:

output:

result:

ok answer = 1

Test #56:

score: 0

Accepted

time: 2ms

memory: 3924kb

input:

output:

result:

ok answer = 1

Test #57:

score: 0

Accepted

time: 4ms

memory: 3884kb

input:

output:

result:

ok answer = 1

Test #58:

score: 0

Accepted

time: 7ms

memory: 4264kb

input:

output:

result:

ok answer = 1

Test #59:

score: 0

Accepted

time: 3ms

memory: 3872kb

input:

output:

result:

ok answer = 1

Test #60:

score: 0

Accepted

time: 2ms

memory: 3872kb

input:

output:

result:

ok answer = 1

Test #61:

score: 0

Accepted

time: 5ms

memory: 3944kb

input:

output:

result:

ok answer = 1

Test #62:

score: 0

Accepted

time: 4ms

memory: 3988kb

input:

output:

result:

ok answer = 1

Test #63:

score: 0

Accepted

time: 7ms

memory: 3972kb

input:

output:

result:

ok answer = 1

Test #64:

score: 0

Accepted

time: 3ms

memory: 3924kb

input:

output:

result:

ok answer = 1

Test #65:

score: 0

Accepted

time: 5ms

memory: 3884kb

input:

output:

result:

ok answer = 1

Test #66:

score: 0

Accepted

time: 5ms

memory: 3944kb

input:

output:

result:

ok answer = 1

Test #67:

score: 0

Accepted

time: 3ms

memory: 3960kb

input:

output:

result:

ok answer = 1

Test #68:

score: 0

Accepted

time: 3ms

memory: 3884kb

input:

output:

result:

ok answer = 1

Test #69:

score: 0

Accepted

time: 5ms

memory: 4200kb

input:

output:

result:

ok answer = 1

Test #70:

score: 0

Accepted

time: 3ms

memory: 4056kb

input:

output:

result:

ok answer = 1

Test #71:

score: 0

Accepted

time: 0ms

memory: 3888kb

input:

output:

result:

ok answer = 1