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Submission #828981

# Submission time Handle Problem Language Result Execution time Memory
828981 2023-08-17T22:31:58 Z QwertyPi Event Hopping (BOI22_events) C++14
100 / 100
 912 ms 187712 KB 
#include <bits/stdc++.h>
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("Ofast")
#define int long long

using namespace std;

const int N = 2e5 + 11;
struct event{
	int s, e, i;
};

event a[N];
int p[N], R[N];
int lift[N][20];
int l2[N][20];
int n, q; 

struct SegTree{
	int t[N << 2];
	void update(int p, int val, int v = 0, int l = 0, int r = n * 2){
		if(l == r) t[v] = min(t[v], val);
		else {
			int m = (l + r) / 2;
			if(p <= m) update(p, val, v * 2 + 1, l, m);
			else update(p, val, v * 2 + 2, m + 1, r);
			t[v] = min(t[v * 2 + 1], t[v * 2 + 2]);
		}
	}
	int query_suff_min(int p, int v = 0, int l = 0, int r = n * 2){
		if(l == r) return t[v];
		int m = (l + r) / 2;
		if(p <= m) return min(query_suff_min(p, v * 2 + 1, l, m), t[v * 2 + 2]);
		else return query_suff_min(p, v * 2 + 2, m + 1, r);
	}
} ST[20];

struct query{
	int u, v, t;
};

int ans[N];

int32_t main(){
	for(int i = 0; i < 20; i++)
		fill(ST[i].t, ST[i].t + (N << 2), 1 << 30);
	cin >> n >> q;
	for(int i = 1; i <= n; i++){
		int s, e; cin >> s >> e; a[i] = {s, e, i};
	}
	{
		set<int> S; map<int, int> mp;
		for(int i = 1; i <= n; i++) S.insert(a[i].s), S.insert(a[i].e);
		int id = 1; for(auto i : S) mp[i] = id++;
		for(int i = 1; i <= n; i++) a[i].s = mp[a[i].s], a[i].e = mp[a[i].e];
	}
	sort(a + 1, a + n + 1, [](event u, event v){ return u.e < v.e; });
	R[n] = n; for(int i = n - 1; i >= 1; i--) R[i] = a[i].e == a[i + 1].e ? R[i + 1] : i;
	for(int i = 1; i <= n; i++) p[a[i].i] = i;

	vector<query> Q;
	for(int i = 0; i < q; i++){
		int u, v; cin >> u >> v; u = p[u], v = p[v];
		Q.push_back({u, v, i});
	}
	sort(Q.begin(), Q.end(), [](query a, query b){ return a.v < b.v; }); int qi = 0;
	for(int i = 1; i <= n; i++){
		for(int j = R[i - 1] + 1; j <= R[i]; j++) ST[0].update(a[j].e, a[j].s);
		lift[a[i].s][0] = ST[0].query_suff_min(a[i].s);
		for(int j = 1; j < 20; j++) {
			ST[j - 1].update(a[i].s, lift[a[i].s][j - 1]);
			lift[a[i].s][j] = ST[j - 1].query_suff_min(lift[a[i].s][j - 1]);
		}
		while(qi < Q.size() && Q[qi].v == i){
			int u = Q[qi].u, v = Q[qi].v, t = Q[qi].t;
			if(a[u].e > a[v].e) ans[t] = -1;
			else if(u == v) ans[t] = 0;
			else if(a[v].s <= a[u].e && a[u].e <= a[v].e) ans[t] = 1;
			else {
				ans[t] = 2;
				int x = a[v].s;
				for(int j = 19; j >= 0; j--){
					if(a[u].e < lift[x][j]) ans[t] += (1 << j), x = lift[x][j];
				}
			}
			qi++;
		}
	}

	for(int i = 0; i < q; i++){
		cout << (ans[i] == -1 || ans[i] > N ? "impossible" : to_string(ans[i])) << '\n';
	}
}

Compilation message

events.cpp: In function 'int32_t main()':
events.cpp:74:12: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<query>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   74 |   while(qi < Q.size() && Q[qi].v == i){
      |         ~~~^~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 42 ms 125540 KB Output is correct
2 Correct 482 ms 157568 KB Output is correct
3 Correct 560 ms 157448 KB Output is correct
4 Correct 505 ms 157412 KB Output is correct
5 Correct 472 ms 160204 KB Output is correct
6 Correct 480 ms 162628 KB Output is correct
7 Correct 484 ms 163360 KB Output is correct
8 Correct 481 ms 184704 KB Output is correct
9 Correct 483 ms 184636 KB Output is correct
10 Correct 531 ms 157736 KB Output is correct
11 Correct 499 ms 168348 KB Output is correct
12 Correct 352 ms 157948 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 50 ms 125548 KB Output is correct
2 Correct 44 ms 125492 KB Output is correct
3 Correct 47 ms 125860 KB Output is correct
4 Correct 47 ms 125804 KB Output is correct
5 Correct 46 ms 125820 KB Output is correct
6 Correct 46 ms 125752 KB Output is correct
7 Correct 47 ms 126116 KB Output is correct
8 Correct 46 ms 125896 KB Output is correct
9 Correct 44 ms 125516 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 50 ms 125548 KB Output is correct
2 Correct 44 ms 125492 KB Output is correct
3 Correct 47 ms 125860 KB Output is correct
4 Correct 47 ms 125804 KB Output is correct
5 Correct 46 ms 125820 KB Output is correct
6 Correct 46 ms 125752 KB Output is correct
7 Correct 47 ms 126116 KB Output is correct
8 Correct 46 ms 125896 KB Output is correct
9 Correct 44 ms 125516 KB Output is correct
10 Correct 50 ms 125516 KB Output is correct
11 Correct 45 ms 125488 KB Output is correct
12 Correct 46 ms 125828 KB Output is correct
13 Correct 45 ms 125840 KB Output is correct
14 Correct 53 ms 125872 KB Output is correct
15 Correct 46 ms 125816 KB Output is correct
16 Correct 46 ms 126028 KB Output is correct
17 Correct 48 ms 125936 KB Output is correct
18 Correct 46 ms 125524 KB Output is correct
19 Correct 127 ms 130644 KB Output is correct
20 Correct 110 ms 130700 KB Output is correct
21 Correct 114 ms 131008 KB Output is correct
22 Correct 107 ms 131000 KB Output is correct
23 Correct 133 ms 133124 KB Output is correct
24 Correct 107 ms 132384 KB Output is correct
25 Correct 108 ms 132880 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 50 ms 125548 KB Output is correct
2 Correct 44 ms 125492 KB Output is correct
3 Correct 47 ms 125860 KB Output is correct
4 Correct 47 ms 125804 KB Output is correct
5 Correct 46 ms 125820 KB Output is correct
6 Correct 46 ms 125752 KB Output is correct
7 Correct 47 ms 126116 KB Output is correct
8 Correct 46 ms 125896 KB Output is correct
9 Correct 44 ms 125516 KB Output is correct
10 Correct 47 ms 125536 KB Output is correct
11 Correct 44 ms 125556 KB Output is correct
12 Correct 51 ms 125856 KB Output is correct
13 Correct 46 ms 125796 KB Output is correct
14 Correct 46 ms 125880 KB Output is correct
15 Correct 46 ms 125852 KB Output is correct
16 Correct 48 ms 126136 KB Output is correct
17 Correct 48 ms 125900 KB Output is correct
18 Correct 45 ms 125596 KB Output is correct
19 Correct 440 ms 155992 KB Output is correct
20 Correct 405 ms 156032 KB Output is correct
21 Correct 424 ms 156104 KB Output is correct
22 Correct 446 ms 165852 KB Output is correct
23 Correct 470 ms 166984 KB Output is correct
24 Correct 505 ms 182612 KB Output is correct
25 Correct 275 ms 129484 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 482 ms 157432 KB Output is correct
2 Correct 505 ms 157476 KB Output is correct
3 Correct 502 ms 157360 KB Output is correct
4 Correct 483 ms 184520 KB Output is correct
5 Correct 493 ms 157772 KB Output is correct
6 Correct 648 ms 184236 KB Output is correct
7 Correct 613 ms 184124 KB Output is correct
8 Correct 565 ms 184260 KB Output is correct
9 Correct 485 ms 166964 KB Output is correct
10 Correct 567 ms 183784 KB Output is correct
11 Correct 528 ms 179676 KB Output is correct
12 Correct 579 ms 183772 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 42 ms 125540 KB Output is correct
2 Correct 482 ms 157568 KB Output is correct
3 Correct 560 ms 157448 KB Output is correct
4 Correct 505 ms 157412 KB Output is correct
5 Correct 472 ms 160204 KB Output is correct
6 Correct 480 ms 162628 KB Output is correct
7 Correct 484 ms 163360 KB Output is correct
8 Correct 481 ms 184704 KB Output is correct
9 Correct 483 ms 184636 KB Output is correct
10 Correct 531 ms 157736 KB Output is correct
11 Correct 499 ms 168348 KB Output is correct
12 Correct 352 ms 157948 KB Output is correct
13 Correct 50 ms 125548 KB Output is correct
14 Correct 44 ms 125492 KB Output is correct
15 Correct 47 ms 125860 KB Output is correct
16 Correct 47 ms 125804 KB Output is correct
17 Correct 46 ms 125820 KB Output is correct
18 Correct 46 ms 125752 KB Output is correct
19 Correct 47 ms 126116 KB Output is correct
20 Correct 46 ms 125896 KB Output is correct
21 Correct 44 ms 125516 KB Output is correct
22 Correct 50 ms 125516 KB Output is correct
23 Correct 45 ms 125488 KB Output is correct
24 Correct 46 ms 125828 KB Output is correct
25 Correct 45 ms 125840 KB Output is correct
26 Correct 53 ms 125872 KB Output is correct
27 Correct 46 ms 125816 KB Output is correct
28 Correct 46 ms 126028 KB Output is correct
29 Correct 48 ms 125936 KB Output is correct
30 Correct 46 ms 125524 KB Output is correct
31 Correct 127 ms 130644 KB Output is correct
32 Correct 110 ms 130700 KB Output is correct
33 Correct 114 ms 131008 KB Output is correct
34 Correct 107 ms 131000 KB Output is correct
35 Correct 133 ms 133124 KB Output is correct
36 Correct 107 ms 132384 KB Output is correct
37 Correct 108 ms 132880 KB Output is correct
38 Correct 47 ms 125536 KB Output is correct
39 Correct 44 ms 125556 KB Output is correct
40 Correct 51 ms 125856 KB Output is correct
41 Correct 46 ms 125796 KB Output is correct
42 Correct 46 ms 125880 KB Output is correct
43 Correct 46 ms 125852 KB Output is correct
44 Correct 48 ms 126136 KB Output is correct
45 Correct 48 ms 125900 KB Output is correct
46 Correct 45 ms 125596 KB Output is correct
47 Correct 440 ms 155992 KB Output is correct
48 Correct 405 ms 156032 KB Output is correct
49 Correct 424 ms 156104 KB Output is correct
50 Correct 446 ms 165852 KB Output is correct
51 Correct 470 ms 166984 KB Output is correct
52 Correct 505 ms 182612 KB Output is correct
53 Correct 275 ms 129484 KB Output is correct
54 Correct 482 ms 157432 KB Output is correct
55 Correct 505 ms 157476 KB Output is correct
56 Correct 502 ms 157360 KB Output is correct
57 Correct 483 ms 184520 KB Output is correct
58 Correct 493 ms 157772 KB Output is correct
59 Correct 648 ms 184236 KB Output is correct
60 Correct 613 ms 184124 KB Output is correct
61 Correct 565 ms 184260 KB Output is correct
62 Correct 485 ms 166964 KB Output is correct
63 Correct 567 ms 183784 KB Output is correct
64 Correct 528 ms 179676 KB Output is correct
65 Correct 579 ms 183772 KB Output is correct
66 Correct 46 ms 125508 KB Output is correct
67 Correct 480 ms 160536 KB Output is correct
68 Correct 483 ms 160616 KB Output is correct
69 Correct 527 ms 160452 KB Output is correct
70 Correct 480 ms 163240 KB Output is correct
71 Correct 480 ms 165868 KB Output is correct
72 Correct 501 ms 166640 KB Output is correct
73 Correct 508 ms 187712 KB Output is correct
74 Correct 472 ms 187596 KB Output is correct
75 Correct 519 ms 160876 KB Output is correct
76 Correct 502 ms 171480 KB Output is correct
77 Correct 388 ms 160324 KB Output is correct
78 Correct 48 ms 125560 KB Output is correct
79 Correct 49 ms 125816 KB Output is correct
80 Correct 46 ms 125888 KB Output is correct
81 Correct 46 ms 125860 KB Output is correct
82 Correct 47 ms 125828 KB Output is correct
83 Correct 48 ms 126080 KB Output is correct
84 Correct 46 ms 125896 KB Output is correct
85 Correct 45 ms 125556 KB Output is correct
86 Correct 109 ms 131640 KB Output is correct
87 Correct 131 ms 131700 KB Output is correct
88 Correct 111 ms 131908 KB Output is correct
89 Correct 105 ms 132056 KB Output is correct
90 Correct 111 ms 133192 KB Output is correct
91 Correct 127 ms 132456 KB Output is correct
92 Correct 108 ms 132796 KB Output is correct
93 Correct 428 ms 157948 KB Output is correct
94 Correct 429 ms 157268 KB Output is correct
95 Correct 475 ms 157980 KB Output is correct
96 Correct 427 ms 167732 KB Output is correct
97 Correct 452 ms 168872 KB Output is correct
98 Correct 517 ms 184500 KB Output is correct
99 Correct 305 ms 130756 KB Output is correct
100 Correct 605 ms 187248 KB Output is correct
101 Correct 621 ms 187220 KB Output is correct
102 Correct 613 ms 187352 KB Output is correct
103 Correct 559 ms 186824 KB Output is correct
104 Correct 586 ms 182876 KB Output is correct
105 Correct 569 ms 186988 KB Output is correct
106 Correct 504 ms 153272 KB Output is correct
107 Correct 562 ms 159816 KB Output is correct
108 Correct 503 ms 160712 KB Output is correct
109 Correct 498 ms 160832 KB Output is correct
110 Correct 912 ms 186048 KB Output is correct
111 Correct 848 ms 186064 KB Output is correct