답안 #1046563

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1046563	2024-08-06T17:00:47 Z	vjudge1	Event Hopping (BOI22_events)	C++17	100 / 100	128 ms	32712 KB

events

#include <bits/stdc++.h>

using namespace std;

#define ar array
#define int long long
#define ld long double

const int N = 5e5 + 20;
const int LOG = 21;
const int INF = 1e17;

namespace seggy{
	ar<int, 2> s[4 * N];
	
	void build(int k,int tl,int tr){
		s[k] = {INF, -1};
 		if(tl == tr)return;
		int tm = (tl + tr) / 2;
		build(k * 2, tl, tm);
		build(k *2 + 1,tm + 1, tr);
	}
	
	void upd(int k,int tl,int tr,int p,ar<int, 2> v){
		if(tl == tr){
			s[k] = min(s[k], v);
			return;
		}
		int tm = (tl + tr) / 2;
		if(p <= tm)upd(k * 2,tl, tm, p, v);
		else upd(k * 2 + 1, tm + 1, tr, p, v);
		s[k] = min(s[k * 2], s[k * 2 + 1]);
	}
	ar<int, 2> qry(int k,int tl,int tr,int l,int r){
		if(l > tr || tl > r)return {INF, -1};
		if(l <= tl && tr <= r)return s[k];
		int tm = (tl + tr) / 2;
		return min(qry(k * 2,tl, tm, l,r), qry(k *2 + 1, tm + 1, tr, l, r));
	}
}


signed main(){ios::sync_with_stdio(false);cin.tie(0);	
	int n, q;
	cin>>n>>q;
	int s[n], e[n];
	vector<int> v;
	for(int i = 0;i < n;i++){
		cin>>s[i]>>e[i];
		v.push_back(s[i]);v.push_back(e[i]);
	}
	sort(v.begin(), v.end());
	v.erase(unique(v.begin(), v.end()), v.end());
	int m = v.size();
	seggy::build(1, 0, m - 1);
	for(int i = 0;i < n;i++){
		s[i] = lower_bound(v.begin(), v.end(), s[i]) - v.begin();
		e[i] = lower_bound(v.begin(), v.end(), e[i]) - v.begin();
		seggy::upd(1, 0, m - 1, e[i], {s[i], i});
	}
	int up[n][LOG];
	
	for(int i = 0;i < n;i++){
		ar<int, 2> j = seggy::qry(1, 0, m-1, s[i], e[i]);
		up[i][0] = j[1];
	}
	for(int j = 1;j < LOG;j++){
		for(int i = 0;i < n;i++){
			up[i][j] = up[up[i][j - 1]][j - 1];
		}	
	}
	
	while(q--){
		int x,y;
		cin>>x>>y;
		--x, --y;
		int ans = 0;
		for(int i = LOG - 1;i >= 0;i--){
			int j = up[y][i];
			if(j == -1)continue;
			if(s[j] > e[x]){
				y = j;
				ans += (1 << i);
			}
		}
		if(x == y)cout<<ans<<'\n';
		else{
			if(s[y] > e[x]){
				y = up[y][0];
				++ans;
			}
			if(s[y] <= e[x] && e[x] <= e[y])cout<<ans + 1<<'\n';
			else cout<<"impossible\n";
		}
	}
}

Subtask #1

10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	344 KB	Output is correct
2	Correct	92 ms	24900 KB	Output is correct
3	Correct	96 ms	25028 KB	Output is correct
4	Correct	106 ms	24768 KB	Output is correct
5	Correct	108 ms	25024 KB	Output is correct
6	Correct	103 ms	28104 KB	Output is correct
7	Correct	103 ms	28136 KB	Output is correct
8	Correct	91 ms	32708 KB	Output is correct
9	Correct	92 ms	32712 KB	Output is correct
10	Correct	100 ms	28336 KB	Output is correct
11	Correct	98 ms	32452 KB	Output is correct
12	Correct	58 ms	27832 KB	Output is correct

Subtask #2

10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	344 KB	Output is correct
2	Correct	0 ms	348 KB	Output is correct
3	Correct	1 ms	648 KB	Output is correct
4	Correct	1 ms	604 KB	Output is correct
5	Correct	1 ms	604 KB	Output is correct
6	Correct	1 ms	600 KB	Output is correct
7	Correct	1 ms	604 KB	Output is correct
8	Correct	1 ms	600 KB	Output is correct
9	Correct	0 ms	604 KB	Output is correct

Subtask #3

15.0 / 15.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	344 KB	Output is correct
2	Correct	0 ms	348 KB	Output is correct
3	Correct	1 ms	648 KB	Output is correct
4	Correct	1 ms	604 KB	Output is correct
5	Correct	1 ms	604 KB	Output is correct
6	Correct	1 ms	600 KB	Output is correct
7	Correct	1 ms	604 KB	Output is correct
8	Correct	1 ms	600 KB	Output is correct
9	Correct	0 ms	604 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	604 KB	Output is correct
13	Correct	1 ms	604 KB	Output is correct
14	Correct	1 ms	604 KB	Output is correct
15	Correct	1 ms	604 KB	Output is correct
16	Correct	1 ms	604 KB	Output is correct
17	Correct	1 ms	604 KB	Output is correct
18	Correct	0 ms	604 KB	Output is correct
19	Correct	20 ms	5084 KB	Output is correct
20	Correct	19 ms	5212 KB	Output is correct
21	Correct	23 ms	5460 KB	Output is correct
22	Correct	17 ms	5468 KB	Output is correct
23	Correct	17 ms	5296 KB	Output is correct
24	Correct	17 ms	5468 KB	Output is correct
25	Correct	17 ms	5116 KB	Output is correct

Subtask #4

15.0 / 15.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	344 KB	Output is correct
2	Correct	0 ms	348 KB	Output is correct
3	Correct	1 ms	648 KB	Output is correct
4	Correct	1 ms	604 KB	Output is correct
5	Correct	1 ms	604 KB	Output is correct
6	Correct	1 ms	600 KB	Output is correct
7	Correct	1 ms	604 KB	Output is correct
8	Correct	1 ms	600 KB	Output is correct
9	Correct	0 ms	604 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	604 KB	Output is correct
13	Correct	1 ms	604 KB	Output is correct
14	Correct	1 ms	604 KB	Output is correct
15	Correct	1 ms	520 KB	Output is correct
16	Correct	1 ms	604 KB	Output is correct
17	Correct	1 ms	604 KB	Output is correct
18	Correct	0 ms	604 KB	Output is correct
19	Correct	76 ms	26140 KB	Output is correct
20	Correct	74 ms	25544 KB	Output is correct
21	Correct	85 ms	26052 KB	Output is correct
22	Correct	85 ms	30408 KB	Output is correct
23	Correct	89 ms	30248 KB	Output is correct
24	Correct	87 ms	30408 KB	Output is correct
25	Correct	26 ms	21204 KB	Output is correct

Subtask #5

20.0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	88 ms	25032 KB	Output is correct
2	Correct	98 ms	25024 KB	Output is correct
3	Correct	108 ms	24776 KB	Output is correct
4	Correct	92 ms	29636 KB	Output is correct
5	Correct	113 ms	25140 KB	Output is correct
6	Correct	110 ms	29128 KB	Output is correct
7	Correct	112 ms	29244 KB	Output is correct
8	Correct	114 ms	29380 KB	Output is correct
9	Correct	90 ms	28356 KB	Output is correct
10	Correct	107 ms	28872 KB	Output is correct
11	Correct	105 ms	28544 KB	Output is correct
12	Correct	114 ms	28872 KB	Output is correct

Subtask #6

30.0 / 30.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	344 KB	Output is correct
2	Correct	92 ms	24900 KB	Output is correct
3	Correct	96 ms	25028 KB	Output is correct
4	Correct	106 ms	24768 KB	Output is correct
5	Correct	108 ms	25024 KB	Output is correct
6	Correct	103 ms	28104 KB	Output is correct
7	Correct	103 ms	28136 KB	Output is correct
8	Correct	91 ms	32708 KB	Output is correct
9	Correct	92 ms	32712 KB	Output is correct
10	Correct	100 ms	28336 KB	Output is correct
11	Correct	98 ms	32452 KB	Output is correct
12	Correct	58 ms	27832 KB	Output is correct
13	Correct	1 ms	344 KB	Output is correct
14	Correct	0 ms	348 KB	Output is correct
15	Correct	1 ms	648 KB	Output is correct
16	Correct	1 ms	604 KB	Output is correct
17	Correct	1 ms	604 KB	Output is correct
18	Correct	1 ms	600 KB	Output is correct
19	Correct	1 ms	604 KB	Output is correct
20	Correct	1 ms	600 KB	Output is correct
21	Correct	0 ms	604 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	604 KB	Output is correct
25	Correct	1 ms	604 KB	Output is correct
26	Correct	1 ms	604 KB	Output is correct
27	Correct	1 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	0 ms	604 KB	Output is correct
31	Correct	20 ms	5084 KB	Output is correct
32	Correct	19 ms	5212 KB	Output is correct
33	Correct	23 ms	5460 KB	Output is correct
34	Correct	17 ms	5468 KB	Output is correct
35	Correct	17 ms	5296 KB	Output is correct
36	Correct	17 ms	5468 KB	Output is correct
37	Correct	17 ms	5116 KB	Output is correct
38	Correct	0 ms	348 KB	Output is correct
39	Correct	0 ms	348 KB	Output is correct
40	Correct	1 ms	604 KB	Output is correct
41	Correct	1 ms	604 KB	Output is correct
42	Correct	1 ms	604 KB	Output is correct
43	Correct	1 ms	520 KB	Output is correct
44	Correct	1 ms	604 KB	Output is correct
45	Correct	1 ms	604 KB	Output is correct
46	Correct	0 ms	604 KB	Output is correct
47	Correct	76 ms	26140 KB	Output is correct
48	Correct	74 ms	25544 KB	Output is correct
49	Correct	85 ms	26052 KB	Output is correct
50	Correct	85 ms	30408 KB	Output is correct
51	Correct	89 ms	30248 KB	Output is correct
52	Correct	87 ms	30408 KB	Output is correct
53	Correct	26 ms	21204 KB	Output is correct
54	Correct	88 ms	25032 KB	Output is correct
55	Correct	98 ms	25024 KB	Output is correct
56	Correct	108 ms	24776 KB	Output is correct
57	Correct	92 ms	29636 KB	Output is correct
58	Correct	113 ms	25140 KB	Output is correct
59	Correct	110 ms	29128 KB	Output is correct
60	Correct	112 ms	29244 KB	Output is correct
61	Correct	114 ms	29380 KB	Output is correct
62	Correct	90 ms	28356 KB	Output is correct
63	Correct	107 ms	28872 KB	Output is correct
64	Correct	105 ms	28544 KB	Output is correct
65	Correct	114 ms	28872 KB	Output is correct
66	Correct	0 ms	344 KB	Output is correct
67	Correct	92 ms	28168 KB	Output is correct
68	Correct	97 ms	28100 KB	Output is correct
69	Correct	111 ms	28100 KB	Output is correct
70	Correct	108 ms	28108 KB	Output is correct
71	Correct	98 ms	28104 KB	Output is correct
72	Correct	104 ms	28100 KB	Output is correct
73	Correct	106 ms	32708 KB	Output is correct
74	Correct	93 ms	32504 KB	Output is correct
75	Correct	98 ms	28364 KB	Output is correct
76	Correct	99 ms	32436 KB	Output is correct
77	Correct	58 ms	27636 KB	Output is correct
78	Correct	1 ms	344 KB	Output is correct
79	Correct	1 ms	604 KB	Output is correct
80	Correct	1 ms	604 KB	Output is correct
81	Correct	1 ms	604 KB	Output is correct
82	Correct	1 ms	604 KB	Output is correct
83	Correct	1 ms	604 KB	Output is correct
84	Correct	1 ms	604 KB	Output is correct
85	Correct	0 ms	604 KB	Output is correct
86	Correct	19 ms	5200 KB	Output is correct
87	Correct	19 ms	5212 KB	Output is correct
88	Correct	22 ms	5336 KB	Output is correct
89	Correct	18 ms	5548 KB	Output is correct
90	Correct	17 ms	5468 KB	Output is correct
91	Correct	17 ms	5468 KB	Output is correct
92	Correct	18 ms	4956 KB	Output is correct
93	Correct	77 ms	26176 KB	Output is correct
94	Correct	72 ms	25544 KB	Output is correct
95	Correct	84 ms	26224 KB	Output is correct
96	Correct	80 ms	30408 KB	Output is correct
97	Correct	88 ms	30416 KB	Output is correct
98	Correct	87 ms	30404 KB	Output is correct
99	Correct	24 ms	21192 KB	Output is correct
100	Correct	116 ms	32196 KB	Output is correct
101	Correct	109 ms	32196 KB	Output is correct
102	Correct	105 ms	32264 KB	Output is correct
103	Correct	109 ms	31944 KB	Output is correct
104	Correct	108 ms	31684 KB	Output is correct
105	Correct	111 ms	31948 KB	Output is correct
106	Correct	92 ms	27564 KB	Output is correct
107	Correct	108 ms	27380 KB	Output is correct
108	Correct	105 ms	28104 KB	Output is correct
109	Correct	113 ms	28196 KB	Output is correct
110	Correct	128 ms	32184 KB	Output is correct
111	Correct	118 ms	32184 KB	Output is correct