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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#762284#7767. 数据结构hxhhxh75 5595ms205088kbC++204.3kb2024-11-19 14:26:112024-11-19 14:26:12

Judging History

你现在查看的是最新测评结果

  • [2024-11-19 14:26:12]
  • 评测
  • 测评结果:75
  • 用时:5595ms
  • 内存:205088kb
  • [2024-11-19 14:26:11]
  • 提交

answer

#include<bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define vpi vector<pii>
#define fi first
#define se second
using namespace std;
const int N=2e5+5;
struct SEG{
	struct st{
		int l,r;
		ll c,s,z;
	}a[N<<2];
	void bt(int x,int l,int r){
		a[x].l=l;
		a[x].r=r;
		a[x].c=a[x].s=a[x].z=0;
		if(l<r){
			bt(x<<1,l,(l+r>>1));
			bt(x<<1|1,(l+r>>1)+1,r);
		}
	}
	void ps(int x,ll v){
		a[x].s+=(a[x].r-a[x].l+1)*v;
		a[x].c+=v;
		a[x].z+=v;
	}
	void xf(int x){
		ps(x<<1,a[x].z);
		ps(x<<1|1,a[x].z);
		a[x].z=0;
	}
	void pu(int x){
		a[x].c=max(a[x<<1].c,a[x<<1|1].c);
		a[x].s=a[x<<1].s+a[x<<1|1].s;
	} 
	void add(int x,int l,int r,ll v){
		if(a[x].l==l&&a[x].r==r) return ps(x,v);
		if(a[x].z) xf(x);
		int mid=a[x].l+a[x].r>>1;
		if(r<=mid) add(x<<1,l,r,v);
		else if(l>mid) add(x<<1|1,l,r,v);
		else add(x<<1,l,mid,v),add(x<<1|1,mid+1,r,v);
		pu(x); 
	}
	ll qs(int x,int l,int r){
		if(a[x].l==l&&a[x].r==r) return a[x].s;
		if(a[x].z) xf(x);
		int mid=a[x].l+a[x].r>>1;
		if(r<=mid) return qs(x<<1,l,r);
		if(l>mid) return qs(x<<1|1,l,r);
		return qs(x<<1,l,mid)+qs(x<<1|1,mid+1,r);
	}
	ll qv(int x,int l,int r){
		if(a[x].l==l&&a[x].r==r) return a[x].c;
		if(a[x].z) xf(x);
		int mid=a[x].l+a[x].r>>1;
		if(r<=mid) return qv(x<<1,l,r);
		if(l>mid) return qv(x<<1|1,l,r);
		return max(qv(x<<1,l,mid),qv(x<<1|1,mid+1,r));
	}
}T;
int n,Q,K,fa[N],dfn[N],hs[N],siz[N],dcnt,dep[N],top[N];
vector<int>e[N],g[N];
vpi tk[N][4],lk[N][4],tr[N];
void dfs1(int x,int f){
	siz[x]=1;
	dep[x]=dep[f]+1;
	fa[x]=f;
	for(int i:e[x]){
		if(i==f) continue;
		dfs1(i,x);
		siz[x]+=siz[i];
		g[x].push_back(i);
	}
	for(int i:g[x]) if(siz[i]>siz[hs[x]]) hs[x]=i;
}
void lb(int x){
	if(!dfn[x]) dfn[x]=++dcnt;
}
void dfs2(int x,int ff){
	top[x]=ff;
	if(ff==x){
		vector<int>u;
		for(int t=x;t;t=hs[t]) u.push_back(t),lb(t);
		for(int i=1;i<=3;i++){
			vector<int>v;
			for(int j:u) for(int l:g[j]) if(top[j]!=x) v.push_back(l),lb(l);
			u=v;
		}
	}
	if(hs[x]) dfs2(hs[x],ff);
	for(int i:g[x]) if(i!=hs[x]) dfs2(i,i);
}
void zp(vpi&x){
	sort(x.begin(),x.end());
	vpi y;
	for(pii i:x){
		if(y.empty()||i.fi>y.back().se+1) y.push_back(i);
		else y.back().se=max(y.back().se,i.se);
	}
	x=y;
}
void add(vpi&x,const vpi&y){
	if(y.empty()) return;
	if(x.empty()) x=y;
	else{
		for(pii i:y) x.push_back(i);
		zp(x);
	}
}
void dfs3(int x){
	tr[x]=tk[x][0]={{dfn[x],dfn[x]}};
	for(int i:g[x]){
		dfs3(i);
		for(int j=0;j<K;j++) add(tk[x][j+1],tk[i][j]);
		add(tr[x],tr[i]);
	}
	for(int i=0;i<K;i++) add(tk[x][i+1],tk[x][i]);
}
void dfs4(int x){
	for(int i=0;i<=K;i++) lk[x][i]=tk[x][i];
	if(x>1) for(int i=0;i<K;i++) add(tk[x][i+1],tk[fa[x]][i]);
	if(top[x]!=x) for(int i=0;i<=K;i++) add(lk[x][i],lk[fa[x]][i]);
	for(int i:g[x]) dfs4(i);
}
int lca(int x,int y){
	while(top[x]!=top[y]){
		if(dep[top[x]]<dep[top[y]]) swap(x,y);
		x=fa[top[x]];
	}
	return dep[x]<dep[y]?x:y;
}
vpi del(vpi a,vpi b){
	vpi res;
	int l=0,r=-1,m=b.size();
	for(pii i:a){
		while(l<m&&b[l].se<i.fi) l++;
		while(r<m-1&&b[r+1].fi<=i.se) r++;
		if(l>r){
			res.push_back(i);
			continue;
		}
		if(i.fi<b[l].fi) res.push_back({i.fi,b[l].fi-1});
		for(int j=l+1;j<=r;j++) res.push_back({b[j-1].se+1,b[j].fi-1});
		if(i.se>b[r].se) res.push_back({b[r].se+1,i.se});
	}
	zp(res);
	return res;
}
vpi qw(int x,int k){
	if(!x) return {};
	vpi res=lk[x][k];
	add(res,qw(fa[top[x]],k));
	return res;
}
vpi ql(int x,int y,int k){
	int u=lca(x,y);
	vpi res=tk[u][k];
	vpi wx=qw(u,k);
	add(res,del(qw(x,k),wx));
	add(res,del(qw(y,k),wx));
	return res;
}
int main(){
//	freopen("T2/zyf8.in","r",stdin);
//	freopen("T2/zyf8.out","w",stdout);
	cin>>n>>Q;K=3;
	for(int i=1,j,k;i<n;i++){
		scanf("%d %d",&j,&k);
		e[j].push_back(k);
		e[k].push_back(j);
	}
	dfs1(1,0);
	dfs2(1,1);
	dfs3(1);
	dfs4(1);
	T.bt(1,1,n);
	for(int op,x,y,k,u;Q--;){
		vpi cw;
		scanf("%d",&op);
		if(op&1) scanf("%d %d %d",&x,&y,&k),cw=ql(x,y,k);
		else scanf("%d",&x),cw=tr[x];
		ll res=0;
		if(op<3){
			scanf("%d",&u);
			for(pii i:cw) T.add(1,i.fi,i.se,u);
		}
		else if(op>4){
			res=-1e15;
			for(pii i:cw) res=max(res,T.qv(1,i.fi,i.se));
		}
		else for(pii i:cw) res+=T.qs(1,i.fi,i.se);
		if(op>2) printf("%lld\n",res);
	}
	return 0;
}

详细

Subtask #1:

score: 10
Accepted

Test #1:

score: 10
Accepted
time: 17ms
memory: 12288kb

input:

5000 5000
1 2
2 3
3 4
4 5
5 6
5 7
6 8
7 9
9 10
8 11
11 12
12 13
12 14
14 15
15 16
16 17
16 18
18 19
18 20
20 21
20 22
22 23
23 24
23 25
23 26
26 27
27 28
28 29
27 30
30 31
29 32
32 33
33 34
32 35
35 36
36 37
35 38
36 39
38 40
38 41
41 42
42 43
43 44
42 45
44 46
45 47
47 48
48 49
48 50
49 51
51 52
52...

output:

37227703492
2136305359188
2794367845468
1309925069860
1698169768858
2678958746332
6690595071246
2087826052960
5786332239171
2186592622
4014965079076
1674542130
6524658548
7094033144666
10065416610040
11589693473717
492570862
3356228199498
2834694279
4198036633070
4395772262
4221137767
9630829210
992...

result:

ok 2559 numbers

Test #2:

score: 10
Accepted
time: 22ms
memory: 13964kb

input:

5000 5000
54 2
1945 3
4131 4
1207 5
3558 6
3582 7
1648 8
3498 9
1761 10
360 11
3617 12
4359 13
158 14
2314 15
529 16
4619 17
1070 18
1504 19
2675 20
2981 21
2142 22
1349 23
1640 24
1374 25
4059 26
2511 27
2708 28
2939 29
3017 30
3320 31
4602 32
4779 33
2697 34
3906 35
1121 36
197 37
1551 38
1119 39
...

output:

0
198262395
0
0
1595057854
0
0
39277179818
13451201574
21469030838
0
0
23554220364
19140694248
212211615641
0
0
0
0
0
86500798
60136122614
47351162248
0
0
306346383502
230306838988
0
170207438
471673864986
387605196674
0
0
0
688392707
115968801311
199501119668
168720065378
634329317954
0
0
155717506...

result:

ok 2456 numbers

Subtask #2:

score: 10
Accepted

Test #3:

score: 10
Accepted
time: 1080ms
memory: 177168kb

input:

200000 200000
1 2
1 3
1 4
3 5
1 6
1 7
7 8
8 9
2 10
1 11
5 12
1 13
7 14
10 15
2 16
7 17
11 18
5 19
5 20
1 21
16 22
1 23
3 24
20 25
14 26
2 27
6 28
15 29
10 30
15 31
5 32
13 33
12 34
31 35
31 36
36 37
36 38
1 39
28 40
5 41
12 42
41 43
20 44
30 45
22 46
11 47
47 48
45 49
14 50
41 51
3 52
30 53
29 54
6 ...

output:

0
0
0
0
0
0
0
0
7615073807
4176911055
0
4745654848
6222845818
0
0
9739142819
0
1424960716
5224818790
9459319003
13717923473
8673060864
0
11610197664
0
0
9587792729
0
0
0
2747489046
12425650803
0
0
11191496476
0
37597503993
0
0
15164651949
14868775382
15559673116
0
16391028892
0
15726757336
0
2421390...

result:

ok 100169 numbers

Test #4:

score: 10
Accepted
time: 1374ms
memory: 184640kb

input:

200000 200000
121679 2
13340 3
45206 4
112138 5
47397 6
88216 7
173469 8
109861 9
58662 10
130056 11
61155 12
4313 13
196310 14
46189 15
32349 16
143798 17
103215 18
159921 19
27365 20
14332 21
49504 22
64451 23
106931 24
59878 25
177587 26
100555 27
86848 28
793 29
79845 30
150813 31
42854 32
11551...

output:

77900221111
0
0
476439705914
0
216029652830
0
0
631267909751
508097390689
0
29277716182
695169620128
0
809294022024
0
0
829507748883
260130797154
0
1005527232590
109198360548
821333235719
0
0
1265757368752
738460021055
296232170804
845184728833
0
434366813420
0
1922343637889
0
0
0
229703081048
0
441...

result:

ok 100073 numbers

Subtask #3:

score: 5
Accepted

Test #5:

score: 5
Accepted
time: 401ms
memory: 190236kb

input:

200000 200000
1 2
2 3
3 4
4 5
5 6
6 7
7 8
8 9
9 10
10 11
11 12
12 13
13 14
14 15
15 16
16 17
17 18
18 19
19 20
20 21
21 22
22 23
23 24
24 25
25 26
26 27
27 28
28 29
29 30
30 31
31 32
32 33
33 34
34 35
35 36
36 37
37 38
38 39
39 40
40 41
41 42
42 43
43 44
44 45
45 46
46 47
47 48
48 49
49 50
50 51
51 ...

output:

0
134315201201061
38210069287857
75889674481730
25202765567748
179527420359031
75824479907233
156951577189979
246509811214535
251383387317167
181645886595511
285463150681348
213797241401335
244909583142805
53376921005282
451665818220
379334117147250
720759810155057
768646965102274
224741692238593
18...

result:

ok 100065 numbers

Test #6:

score: 5
Accepted
time: 378ms
memory: 189956kb

input:

200000 200000
1 2
2 3
3 4
4 5
5 6
6 7
7 8
8 9
9 10
10 11
11 12
12 13
13 14
14 15
15 16
16 17
17 18
18 19
19 20
20 21
21 22
22 23
23 24
24 25
25 26
26 27
27 28
28 29
29 30
30 31
31 32
32 33
33 34
34 35
35 36
36 37
37 38
38 39
39 40
40 41
41 42
42 43
43 44
44 45
45 46
46 47
47 48
48 49
49 50
50 51
51 ...

output:

0
1950387013442
2906443199266
2144858813468
3137341049831
1081425884175
20924388962208
73530126133368
136609133052209
125022026678010
22502893517249
99022896674514
84010333777754
13909990392191
43442491331837
190816082733002
92810414504491
244006706308139
42843404030538
126151201042579
7249812065288...

result:

ok 99740 numbers

Subtask #4:

score: 10
Accepted

Test #7:

score: 10
Accepted
time: 1860ms
memory: 175976kb

input:

200000 200000
1 2
2 3
3 4
1 5
3 6
5 7
5 8
7 9
2 10
7 11
11 12
10 13
6 14
3 15
14 16
4 17
11 18
3 19
14 20
4 21
4 22
12 23
18 24
5 25
5 26
14 27
13 28
24 29
11 30
26 31
29 32
28 33
31 34
23 35
33 36
6 37
11 38
22 39
13 40
35 41
37 42
21 43
12 44
4 45
16 46
12 47
21 48
1 49
26 50
45 51
41 52
46 53
7 5...

output:

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
...

result:

ok 99786 numbers

Test #8:

score: 10
Accepted
time: 575ms
memory: 198336kb

input:

200000 200000
1 2
2 3
1 4
1 5
2 6
3 7
6 8
8 9
8 10
9 11
8 12
12 13
13 14
11 15
13 16
13 17
16 18
17 19
18 20
19 21
19 22
21 23
21 24
21 25
24 26
23 27
26 28
27 29
26 30
30 31
28 32
29 33
32 34
32 35
33 36
36 37
35 38
38 39
38 40
40 41
39 42
42 43
43 44
41 45
45 46
43 47
45 48
46 49
49 50
50 51
51 52...

output:

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
...

result:

ok 100404 numbers

Test #9:

score: 10
Accepted
time: 1160ms
memory: 183196kb

input:

200000 200000
166945 2
60190 3
101888 4
154621 5
188595 6
175999 7
140051 8
54071 9
167394 10
54228 11
48270 12
14564 13
25727 14
138072 15
77670 16
77795 17
155644 18
171648 19
94412 20
65323 21
130225 22
6359 23
17410 24
8580 25
142556 26
152863 27
166869 28
115234 29
87099 30
160349 31
98200 32
1...

output:

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
...

result:

ok 99768 numbers

Subtask #5:

score: 10
Accepted

Dependency #4:

100%
Accepted

Test #10:

score: 10
Accepted
time: 5595ms
memory: 177300kb

input:

200000 200000
1 2
1 3
2 4
1 5
2 6
2 7
2 8
5 9
3 10
10 11
5 12
4 13
5 14
9 15
11 16
14 17
12 18
13 19
2 20
16 21
3 22
16 23
2 24
7 25
8 26
20 27
21 28
11 29
12 30
4 31
2 32
21 33
14 34
29 35
16 36
21 37
28 38
22 39
27 40
12 41
36 42
32 43
30 44
3 45
43 46
4 47
14 48
44 49
9 50
37 51
20 52
11 53
31 54...

output:

0
0
0
0
0
0
0
0
0
0
0
0
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...

result:

ok 100258 numbers

Test #11:

score: 10
Accepted
time: 1463ms
memory: 183516kb

input:

200000 200000
184821 2
53793 3
183415 4
113765 5
178864 6
46342 7
933 8
197825 9
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25495 14
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75134 21
53020 22
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30142 24
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164296 28
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2...

output:

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...

result:

ok 100336 numbers

Subtask #6:

score: 15
Accepted

Dependency #4:

100%
Accepted

Dependency #5:

100%
Accepted

Test #12:

score: 15
Accepted
time: 2713ms
memory: 176652kb

input:

200000 200000
1 2
1 3
2 4
2 5
5 6
3 7
2 8
3 9
4 10
7 11
9 12
7 13
2 14
12 15
6 16
5 17
14 18
3 19
14 20
13 21
8 22
7 23
12 24
5 25
3 26
18 27
9 28
8 29
6 30
22 31
5 32
6 33
28 34
19 35
24 36
24 37
35 38
7 39
32 40
20 41
19 42
14 43
1 44
5 45
30 46
9 47
30 48
5 49
44 50
7 51
13 52
11 53
19 54
31 55
4...

output:

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...

result:

ok 100044 numbers

Test #13:

score: 15
Accepted
time: 1884ms
memory: 150020kb

input:

200000 200000
1 2
1 3
2 4
2 5
3 6
3 7
4 8
4 9
5 10
5 11
6 12
6 13
7 14
7 15
8 16
8 17
9 18
9 19
10 20
10 21
11 22
11 23
12 24
12 25
13 26
13 27
14 28
14 29
15 30
15 31
16 32
16 33
17 34
17 35
18 36
18 37
19 38
19 39
20 40
20 41
21 42
21 43
22 44
22 45
23 46
23 47
24 48
24 49
25 50
25 51
26 52
26 53
...

output:

0
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58950
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226707
325962
312984
...

result:

ok 100096 numbers

Test #14:

score: 15
Accepted
time: 1526ms
memory: 149848kb

input:

200000 200000
1 2
1 3
2 4
2 5
3 6
3 7
4 8
4 9
5 10
5 11
6 12
6 13
7 14
7 15
8 16
8 17
9 18
9 19
10 20
10 21
11 22
11 23
12 24
12 25
13 26
13 27
14 28
14 29
15 30
15 31
16 32
16 33
17 34
17 35
18 36
18 37
19 38
19 39
20 40
20 41
21 42
21 43
22 44
22 45
23 46
23 47
24 48
24 49
25 50
25 51
26 52
26 53
...

output:

0
0
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298410
1803117...

result:

ok 100062 numbers

Test #15:

score: 15
Accepted
time: 575ms
memory: 205088kb

input:

200000 200000
1 2
2 3
2 4
3 5
4 6
6 7
7 8
8 9
8 10
9 11
11 12
12 13
12 14
13 15
15 16
16 17
17 18
17 19
19 20
19 21
21 22
22 23
22 24
23 25
24 26
25 27
27 28
27 29
28 30
29 31
30 32
31 33
33 34
34 35
34 36
35 37
36 38
38 39
39 40
39 41
40 42
41 43
43 44
43 45
44 46
46 47
47 48
48 49
49 50
50 51
51 5...

output:

0
0
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46196526...

result:

ok 100401 numbers

Test #16:

score: 15
Accepted
time: 1026ms
memory: 183724kb

input:

200000 200000
170804 2
114218 3
118786 4
81407 5
92607 6
121128 7
39792 8
17516 9
151784 10
45071 11
109409 12
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28336 16
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138015 21
10446 22
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111765 28
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33044 31
133963 3...

output:

0
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0...

result:

ok 100179 numbers

Subtask #7:

score: 15
Accepted

Dependency #2:

100%
Accepted

Dependency #4:

100%
Accepted

Test #17:

score: 15
Accepted
time: 1415ms
memory: 176656kb

input:

200000 200000
1 2
1 3
3 4
1 5
2 6
3 7
1 8
5 9
6 10
9 11
2 12
8 13
3 14
4 15
12 16
10 17
2 18
2 19
14 20
12 21
9 22
19 23
14 24
3 25
13 26
21 27
11 28
5 29
9 30
13 31
13 32
4 33
6 34
14 35
14 36
31 37
13 38
10 39
4 40
28 41
13 42
14 43
20 44
37 45
8 46
14 47
32 48
21 49
40 50
46 51
20 52
44 53
15 54
...

output:

0
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2500525...

result:

ok 100098 numbers

Test #18:

score: 15
Accepted
time: 1359ms
memory: 150976kb

input:

200000 200000
1 2
1 3
2 4
2 5
3 6
3 7
4 8
4 9
5 10
5 11
6 12
6 13
7 14
7 15
8 16
8 17
9 18
9 19
10 20
10 21
11 22
11 23
12 24
12 25
13 26
13 27
14 28
14 29
15 30
15 31
16 32
16 33
17 34
17 35
18 36
18 37
19 38
19 39
20 40
20 41
21 42
21 43
22 44
22 45
23 46
23 47
24 48
24 49
25 50
25 51
26 52
26 53
...

output:

1506
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32308
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0
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1493614
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83560
86276
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24415019
102280
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17894104
25995202
96677
14391781
110124
12872...

result:

ok 99928 numbers

Test #19:

score: 15
Accepted
time: 1612ms
memory: 173336kb

input:

200000 200000
1 2
1 3
2 4
2 5
3 6
3 7
4 8
4 9
5 10
5 11
6 12
6 13
7 14
7 15
8 16
8 17
9 18
9 19
10 20
10 21
11 22
11 23
12 24
12 25
13 26
13 27
14 28
14 29
15 30
15 31
16 32
16 33
17 34
17 35
18 36
18 37
19 38
19 39
20 40
20 41
21 42
21 43
22 44
22 45
23 46
23 47
24 48
24 49
25 50
25 51
26 52
26 53
...

output:

0
6432
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2146
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16481
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157054
65948
40570
183418
150579
145757
147361
89223
4664
78041
329787
100673
50134
6...

result:

ok 100068 numbers

Subtask #8:

score: 0
Time Limit Exceeded

Dependency #1:

100%
Accepted

Dependency #2:

100%
Accepted

Dependency #3:

100%
Accepted

Dependency #4:

100%
Accepted

Dependency #5:

100%
Accepted

Dependency #6:

100%
Accepted

Dependency #7:

100%
Accepted

Test #20:

score: 0
Time Limit Exceeded

input:

200000 200000
1 2
2 3
2 4
1 5
5 6
4 7
6 8
7 9
1 10
10 11
10 12
4 13
1 14
5 15
2 16
14 17
2 18
1 19
6 20
5 21
20 22
12 23
1 24
17 25
15 26
25 27
12 28
10 29
14 30
5 31
6 32
21 33
15 34
13 35
34 36
10 37
23 38
25 39
4 40
5 41
38 42
42 43
17 44
4 45
40 46
32 47
21 48
6 49
12 50
4 51
19 52
15 53
37 54
4...

output:

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result: