#include <bits/stdc++.h>
#define int long long
#define sz(a) (int)a.size()
#define all(a) a.begin(), a.end()
using namespace std;
struct node {
int sum,index;
node* left, *right;
void update() {
sum = max(left->sum,right->sum);
if(left->sum > right->sum) index=left->index;
else index=right->index;
}
node(){
sum=0;
index=0;
left=NULL;
right=NULL;
}
};
pair<int,int> query(node* root, int left, int right, int qLeft, int qRight) {
if (left > qRight || right < qLeft) return {-1e9,-1};
if (left >= qLeft && right <= qRight) return {root->sum, root->index};
int mid = (left + right) / 2;
pair<int,int> l=query(root->left, left, mid, qLeft, qRight);
pair<int,int> r=query(root->right, mid + 1, right, qLeft, qRight);
if(l.first>r.first) return l;
else return r;
}
void build(node* root, int left, int right, const vector<pair<int,int>>& v) {
if (left == right) {
root->sum = v[left].first;
root->index=v[left].second;
return;
}
int mid = (left + right) / 2;
root->left = new node();
root->right = new node();
build(root->left, left, mid, move(v));
build(root->right, mid+1, right, move(v));
root->update();
}
node* root;
vector<vector<int>> parent;
const int LOG=31;
vector<int> depth;
vector<int> tree;
bool lca(int a, int b){
if(tree[a]!=tree[b]||depth[b]<depth[a]) return false;
int d=depth[b]-depth[a];
for (int j = LOG-1; j>=0; j--)
{
if(d&(1<<j)) b=parent[b][j];
}
return (a==b);
}
vector<pair<int,int>> a;
vector<vector<int>> child;
int n,m;
void dfs(int x, int d){
depth[x]=d;
for (auto u : child[x]) {
tree[u]=tree[x];
dfs(u,d+1);
}
}
signed main() {
ios_base::sync_with_stdio(false); cin.tie(nullptr);
cin >> n >> m;
a.resize(n);
depth.resize(n);
tree.resize(n);
parent.resize(n,vector<int>(LOG));
child.resize(n);
unordered_map<int,int> conv;
set<int> cord;
cord.insert(0);
cord.insert(m);
for (int i = 0; i < n; i++){
cin >> a[i].first >> a[i].second;
cord.insert(a[i].first);
cord.insert(a[i].second);
if(a[i].first>a[i].second) {
a[i].second+=m;
cord.insert(a[i].second);
}
}
int x=0;
for (auto u : cord)
{
conv[u]=x;
x++;
}
vector<pair<int,int>> buildSEGTREE(x,{-1e9,-1});
sort(a.begin(),a.end());
for (int i = 0; i < n; i++) {
if(buildSEGTREE[conv[a[i].first]].first<conv[a[i].second]){
buildSEGTREE[conv[a[i].first]]={conv[a[i].second],i};
}
}
root=new node();
build(root, 0,x-1,move(buildSEGTREE));
vector<int> roots;
for (int i = 0; i < n; i++)
{
int p=query(root,0,x-1,conv[a[i].first],conv[a[i].second]).second;
parent[i][0]=i;
if(p>=0&&p!=i) {
child[p].push_back(i);
parent[i][0]=p;
}
else roots.push_back(i);
}
for (int j = 1; j < LOG; j++)
{
for (int i = 0; i < n; i++)
{
parent[i][j]=parent[parent[i][j-1]][j-1];
}
}
for (int i = 0; i < sz(roots); i++){
dfs(roots[i],0);
}
int mn=1e12;
for (int i = 0; i < n; i++){
if(a[i].second>=m){
int p=query(root,0,x-1,conv[0],conv[(a[i].second-m)]).second;
if(p==-1||i==p||!lca(i,p)) continue;
mn=min(abs(depth[p]-depth[i])+1,mn);
}
}
if(mn==1e12) mn=-1;
cout << mn << "\n";
return 0;
}
/*
10 240
3 68
7 126
40 121
58 152
73 139
89 166
121 197
126 311
212 271
237 350
*/
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
344 KB |
Output is correct |
2 |
Correct |
1 ms |
344 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
344 KB |
Output is correct |
8 |
Correct |
0 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
0 ms |
348 KB |
Output is correct |
12 |
Correct |
1 ms |
348 KB |
Output is correct |
13 |
Correct |
0 ms |
348 KB |
Output is correct |
14 |
Correct |
0 ms |
348 KB |
Output is correct |
15 |
Correct |
1 ms |
348 KB |
Output is correct |
16 |
Correct |
0 ms |
348 KB |
Output is correct |
17 |
Correct |
0 ms |
348 KB |
Output is correct |
18 |
Correct |
0 ms |
348 KB |
Output is correct |
19 |
Correct |
0 ms |
348 KB |
Output is correct |
20 |
Correct |
1 ms |
348 KB |
Output is correct |
21 |
Correct |
0 ms |
348 KB |
Output is correct |
22 |
Correct |
0 ms |
348 KB |
Output is correct |
23 |
Correct |
0 ms |
348 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
344 KB |
Output is correct |
2 |
Correct |
1 ms |
344 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
344 KB |
Output is correct |
8 |
Correct |
0 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
0 ms |
348 KB |
Output is correct |
12 |
Correct |
1 ms |
348 KB |
Output is correct |
13 |
Correct |
0 ms |
348 KB |
Output is correct |
14 |
Correct |
0 ms |
348 KB |
Output is correct |
15 |
Correct |
1 ms |
348 KB |
Output is correct |
16 |
Correct |
0 ms |
348 KB |
Output is correct |
17 |
Correct |
0 ms |
348 KB |
Output is correct |
18 |
Correct |
0 ms |
348 KB |
Output is correct |
19 |
Correct |
0 ms |
348 KB |
Output is correct |
20 |
Correct |
1 ms |
348 KB |
Output is correct |
21 |
Correct |
0 ms |
348 KB |
Output is correct |
22 |
Correct |
0 ms |
348 KB |
Output is correct |
23 |
Correct |
0 ms |
348 KB |
Output is correct |
24 |
Correct |
1 ms |
348 KB |
Output is correct |
25 |
Correct |
0 ms |
604 KB |
Output is correct |
26 |
Correct |
0 ms |
604 KB |
Output is correct |
27 |
Correct |
0 ms |
604 KB |
Output is correct |
28 |
Correct |
1 ms |
604 KB |
Output is correct |
29 |
Correct |
1 ms |
604 KB |
Output is correct |
30 |
Correct |
1 ms |
604 KB |
Output is correct |
31 |
Correct |
0 ms |
604 KB |
Output is correct |
32 |
Correct |
1 ms |
604 KB |
Output is correct |
33 |
Correct |
1 ms |
604 KB |
Output is correct |
34 |
Correct |
0 ms |
604 KB |
Output is correct |
35 |
Correct |
1 ms |
604 KB |
Output is correct |
36 |
Correct |
1 ms |
604 KB |
Output is correct |
37 |
Correct |
0 ms |
604 KB |
Output is correct |
38 |
Correct |
1 ms |
604 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
344 KB |
Output is correct |
2 |
Correct |
1 ms |
344 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
344 KB |
Output is correct |
8 |
Correct |
0 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
0 ms |
348 KB |
Output is correct |
12 |
Correct |
1 ms |
348 KB |
Output is correct |
13 |
Correct |
0 ms |
348 KB |
Output is correct |
14 |
Correct |
0 ms |
348 KB |
Output is correct |
15 |
Correct |
1 ms |
348 KB |
Output is correct |
16 |
Correct |
0 ms |
348 KB |
Output is correct |
17 |
Correct |
0 ms |
348 KB |
Output is correct |
18 |
Correct |
0 ms |
348 KB |
Output is correct |
19 |
Correct |
0 ms |
348 KB |
Output is correct |
20 |
Correct |
1 ms |
348 KB |
Output is correct |
21 |
Correct |
0 ms |
348 KB |
Output is correct |
22 |
Correct |
0 ms |
348 KB |
Output is correct |
23 |
Correct |
0 ms |
348 KB |
Output is correct |
24 |
Correct |
1 ms |
348 KB |
Output is correct |
25 |
Correct |
0 ms |
604 KB |
Output is correct |
26 |
Correct |
0 ms |
604 KB |
Output is correct |
27 |
Correct |
0 ms |
604 KB |
Output is correct |
28 |
Correct |
1 ms |
604 KB |
Output is correct |
29 |
Correct |
1 ms |
604 KB |
Output is correct |
30 |
Correct |
1 ms |
604 KB |
Output is correct |
31 |
Correct |
0 ms |
604 KB |
Output is correct |
32 |
Correct |
1 ms |
604 KB |
Output is correct |
33 |
Correct |
1 ms |
604 KB |
Output is correct |
34 |
Correct |
0 ms |
604 KB |
Output is correct |
35 |
Correct |
1 ms |
604 KB |
Output is correct |
36 |
Correct |
1 ms |
604 KB |
Output is correct |
37 |
Correct |
0 ms |
604 KB |
Output is correct |
38 |
Correct |
1 ms |
604 KB |
Output is correct |
39 |
Correct |
7 ms |
3928 KB |
Output is correct |
40 |
Correct |
7 ms |
4188 KB |
Output is correct |
41 |
Correct |
8 ms |
3932 KB |
Output is correct |
42 |
Correct |
5 ms |
3420 KB |
Output is correct |
43 |
Correct |
6 ms |
2908 KB |
Output is correct |
44 |
Correct |
5 ms |
3420 KB |
Output is correct |
45 |
Correct |
5 ms |
3420 KB |
Output is correct |
46 |
Correct |
6 ms |
3420 KB |
Output is correct |
47 |
Correct |
7 ms |
3932 KB |
Output is correct |
48 |
Correct |
8 ms |
3932 KB |
Output is correct |
49 |
Correct |
5 ms |
4188 KB |
Output is correct |
50 |
Correct |
5 ms |
3160 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
344 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
424 KB |
Output is correct |
7 |
Correct |
0 ms |
348 KB |
Output is correct |
8 |
Correct |
0 ms |
600 KB |
Output is correct |
9 |
Correct |
1 ms |
600 KB |
Output is correct |
10 |
Correct |
1 ms |
604 KB |
Output is correct |
11 |
Correct |
0 ms |
604 KB |
Output is correct |
12 |
Correct |
0 ms |
604 KB |
Output is correct |
13 |
Correct |
0 ms |
604 KB |
Output is correct |
14 |
Correct |
0 ms |
604 KB |
Output is correct |
15 |
Correct |
6 ms |
4064 KB |
Output is correct |
16 |
Correct |
4 ms |
3420 KB |
Output is correct |
17 |
Correct |
5 ms |
2908 KB |
Output is correct |
18 |
Correct |
5 ms |
3344 KB |
Output is correct |
19 |
Correct |
6 ms |
3932 KB |
Output is correct |
20 |
Correct |
87 ms |
68392 KB |
Output is correct |
21 |
Correct |
448 ms |
149588 KB |
Output is correct |
22 |
Correct |
461 ms |
149444 KB |
Output is correct |
23 |
Correct |
240 ms |
121984 KB |
Output is correct |
24 |
Correct |
484 ms |
159104 KB |
Output is correct |
25 |
Correct |
356 ms |
103728 KB |
Output is correct |
26 |
Correct |
286 ms |
117980 KB |
Output is correct |
27 |
Correct |
358 ms |
125820 KB |
Output is correct |
28 |
Correct |
432 ms |
153032 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
344 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
344 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
348 KB |
Output is correct |
8 |
Correct |
0 ms |
604 KB |
Output is correct |
9 |
Correct |
1 ms |
604 KB |
Output is correct |
10 |
Correct |
1 ms |
604 KB |
Output is correct |
11 |
Correct |
1 ms |
604 KB |
Output is correct |
12 |
Correct |
7 ms |
3988 KB |
Output is correct |
13 |
Correct |
4 ms |
3420 KB |
Output is correct |
14 |
Correct |
6 ms |
3144 KB |
Output is correct |
15 |
Correct |
91 ms |
68304 KB |
Output is correct |
16 |
Correct |
261 ms |
122016 KB |
Output is correct |
17 |
Correct |
483 ms |
154560 KB |
Output is correct |
18 |
Correct |
597 ms |
158148 KB |
Output is correct |
19 |
Correct |
447 ms |
161984 KB |
Output is correct |
20 |
Correct |
255 ms |
116988 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
344 KB |
Output is correct |
2 |
Correct |
1 ms |
344 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
344 KB |
Output is correct |
8 |
Correct |
0 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
0 ms |
348 KB |
Output is correct |
12 |
Correct |
1 ms |
348 KB |
Output is correct |
13 |
Correct |
0 ms |
348 KB |
Output is correct |
14 |
Correct |
0 ms |
348 KB |
Output is correct |
15 |
Correct |
1 ms |
348 KB |
Output is correct |
16 |
Correct |
0 ms |
348 KB |
Output is correct |
17 |
Correct |
0 ms |
348 KB |
Output is correct |
18 |
Correct |
0 ms |
348 KB |
Output is correct |
19 |
Correct |
0 ms |
348 KB |
Output is correct |
20 |
Correct |
1 ms |
348 KB |
Output is correct |
21 |
Correct |
0 ms |
348 KB |
Output is correct |
22 |
Correct |
0 ms |
348 KB |
Output is correct |
23 |
Correct |
0 ms |
348 KB |
Output is correct |
24 |
Correct |
1 ms |
348 KB |
Output is correct |
25 |
Correct |
0 ms |
604 KB |
Output is correct |
26 |
Correct |
0 ms |
604 KB |
Output is correct |
27 |
Correct |
0 ms |
604 KB |
Output is correct |
28 |
Correct |
1 ms |
604 KB |
Output is correct |
29 |
Correct |
1 ms |
604 KB |
Output is correct |
30 |
Correct |
1 ms |
604 KB |
Output is correct |
31 |
Correct |
0 ms |
604 KB |
Output is correct |
32 |
Correct |
1 ms |
604 KB |
Output is correct |
33 |
Correct |
1 ms |
604 KB |
Output is correct |
34 |
Correct |
0 ms |
604 KB |
Output is correct |
35 |
Correct |
1 ms |
604 KB |
Output is correct |
36 |
Correct |
1 ms |
604 KB |
Output is correct |
37 |
Correct |
0 ms |
604 KB |
Output is correct |
38 |
Correct |
1 ms |
604 KB |
Output is correct |
39 |
Correct |
7 ms |
3928 KB |
Output is correct |
40 |
Correct |
7 ms |
4188 KB |
Output is correct |
41 |
Correct |
8 ms |
3932 KB |
Output is correct |
42 |
Correct |
5 ms |
3420 KB |
Output is correct |
43 |
Correct |
6 ms |
2908 KB |
Output is correct |
44 |
Correct |
5 ms |
3420 KB |
Output is correct |
45 |
Correct |
5 ms |
3420 KB |
Output is correct |
46 |
Correct |
6 ms |
3420 KB |
Output is correct |
47 |
Correct |
7 ms |
3932 KB |
Output is correct |
48 |
Correct |
8 ms |
3932 KB |
Output is correct |
49 |
Correct |
5 ms |
4188 KB |
Output is correct |
50 |
Correct |
5 ms |
3160 KB |
Output is correct |
51 |
Correct |
0 ms |
348 KB |
Output is correct |
52 |
Correct |
0 ms |
348 KB |
Output is correct |
53 |
Correct |
0 ms |
344 KB |
Output is correct |
54 |
Correct |
0 ms |
348 KB |
Output is correct |
55 |
Correct |
0 ms |
348 KB |
Output is correct |
56 |
Correct |
0 ms |
424 KB |
Output is correct |
57 |
Correct |
0 ms |
348 KB |
Output is correct |
58 |
Correct |
0 ms |
600 KB |
Output is correct |
59 |
Correct |
1 ms |
600 KB |
Output is correct |
60 |
Correct |
1 ms |
604 KB |
Output is correct |
61 |
Correct |
0 ms |
604 KB |
Output is correct |
62 |
Correct |
0 ms |
604 KB |
Output is correct |
63 |
Correct |
0 ms |
604 KB |
Output is correct |
64 |
Correct |
0 ms |
604 KB |
Output is correct |
65 |
Correct |
6 ms |
4064 KB |
Output is correct |
66 |
Correct |
4 ms |
3420 KB |
Output is correct |
67 |
Correct |
5 ms |
2908 KB |
Output is correct |
68 |
Correct |
5 ms |
3344 KB |
Output is correct |
69 |
Correct |
6 ms |
3932 KB |
Output is correct |
70 |
Correct |
87 ms |
68392 KB |
Output is correct |
71 |
Correct |
448 ms |
149588 KB |
Output is correct |
72 |
Correct |
461 ms |
149444 KB |
Output is correct |
73 |
Correct |
240 ms |
121984 KB |
Output is correct |
74 |
Correct |
484 ms |
159104 KB |
Output is correct |
75 |
Correct |
356 ms |
103728 KB |
Output is correct |
76 |
Correct |
286 ms |
117980 KB |
Output is correct |
77 |
Correct |
358 ms |
125820 KB |
Output is correct |
78 |
Correct |
432 ms |
153032 KB |
Output is correct |
79 |
Correct |
0 ms |
348 KB |
Output is correct |
80 |
Correct |
0 ms |
344 KB |
Output is correct |
81 |
Correct |
0 ms |
348 KB |
Output is correct |
82 |
Correct |
0 ms |
344 KB |
Output is correct |
83 |
Correct |
0 ms |
348 KB |
Output is correct |
84 |
Correct |
0 ms |
348 KB |
Output is correct |
85 |
Correct |
0 ms |
348 KB |
Output is correct |
86 |
Correct |
0 ms |
604 KB |
Output is correct |
87 |
Correct |
1 ms |
604 KB |
Output is correct |
88 |
Correct |
1 ms |
604 KB |
Output is correct |
89 |
Correct |
1 ms |
604 KB |
Output is correct |
90 |
Correct |
7 ms |
3988 KB |
Output is correct |
91 |
Correct |
4 ms |
3420 KB |
Output is correct |
92 |
Correct |
6 ms |
3144 KB |
Output is correct |
93 |
Correct |
91 ms |
68304 KB |
Output is correct |
94 |
Correct |
261 ms |
122016 KB |
Output is correct |
95 |
Correct |
483 ms |
154560 KB |
Output is correct |
96 |
Correct |
597 ms |
158148 KB |
Output is correct |
97 |
Correct |
447 ms |
161984 KB |
Output is correct |
98 |
Correct |
255 ms |
116988 KB |
Output is correct |
99 |
Correct |
501 ms |
153788 KB |
Output is correct |
100 |
Correct |
506 ms |
153236 KB |
Output is correct |
101 |
Correct |
466 ms |
164608 KB |
Output is correct |
102 |
Correct |
448 ms |
161684 KB |
Output is correct |
103 |
Correct |
300 ms |
125828 KB |
Output is correct |
104 |
Correct |
398 ms |
150716 KB |
Output is correct |
105 |
Correct |
288 ms |
158140 KB |
Output is correct |