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Submission #713616

# Submission time Handle Problem Language Result Execution time Memory
713616 2023-03-22T16:27:09 Z HamletPetrosyan Event Hopping (BOI22_events) C++17
100 / 100
 347 ms 27044 KB 
#include <bits/stdc++.h>
using namespace std;

#define len(a) ((int)(a).size())
#define all(a) (a).begin(), (a).end()
#define pii pair<int, int>
#define fr first
#define sc second

const int INF = 1e9;
const int N = 2e5 + 5, lN = 18;

int n, q;
pii a[N];
int par[N][lN];

vector<int> temp, ind;
map<int, int> mp;

pii t[4 * N];

void build(int v, int tl, int tr){
	if(tl == tr){
		t[v] = {INF, -1};
		return;
	}
	int tm = (tl + tr) / 2;
	build(2 * v + 0, tl, tm + 0);
	build(2 * v + 1, tm + 1, tr);
	t[v] = {INF, -1};
}

void update(int v, int tl, int tr, int ind, int val, int i){
	if(tl == tr){
		t[v] = min(t[v], {val, i});
		return;
	}
	int tm = (tl + tr) / 2;
	if(ind <= tm) update(2 * v + 0, tl, tm + 0, ind, val, i);
	else update(2 * v + 1, tm + 1, tr, ind, val, i);
	t[v] = min(t[2 * v + 0], t[2 * v + 1]);
}

pii get(int v, int tl, int tr, int l, int r){
	if(l > r) return (pii){INF, -1};
	if(tl == l && tr == r) return t[v];
	int tm = (tl + tr) / 2;
	return min(get(2 * v + 0, tl, tm + 0, l, min(r, tm + 0)),
			   get(2 * v + 1, tm + 1, tr, max(l, tm + 1), r));
}

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	cin >> n >> q;
	for(int i = 0; i < n; i++){
		cin >> a[i].fr >> a[i].sc;
		temp.push_back(a[i].fr);
		temp.push_back(a[i].sc);
		ind.push_back(i);
	}
	sort(all(temp));
	sort(all(ind), [](int i, int j){ return a[i] < a[j]; });

	int last = -1, cnt = 0;
	for(int i = 0; i < len(temp); i++){
		if(temp[i] == last) continue;
		cnt++;
		last = temp[i];
		mp[temp[i]] = cnt;
	}

	build(1, 1, cnt);
	for(int i = 0; i < n; i++){
		a[i].fr = mp[a[i].fr];
		a[i].sc = mp[a[i].sc];
		update(1, 1, cnt, a[i].sc, a[i].fr, i);
	}

	for(int i = 0; i < n; i++){
		pii h = get(1, 1, cnt, a[i].fr, a[i].sc);
		par[i][0] = (h.fr >= a[i].fr ? i : h.sc);
	}
	for(auto i : ind){
		for(int j = 1; j < lN; j++){
			par[i][j] = par[par[i][j - 1]][j - 1];
		}
	}

	int x, y;
	while(q--){
		cin >> x >> y;
		x--, y--;
		if(x == y){
			cout << "0\n";
			continue;
		}
		if(a[x].sc > a[y].sc){
			cout << "impossible\n";
			continue;
		}
		if(a[x].sc >= a[y].fr){
			cout << "1\n";
			continue;
		}

		int ans = 2;
		for(int i = lN - 1; ~i; i--){
			if(a[par[y][i]].fr <= a[x].sc) continue;
			ans += (1 << i);
			y = par[y][i];
		}
		if(a[par[y][0]].fr > a[x].sc){
			cout << "impossible\n";
			continue;
		}
		cout << ans << "\n";
	}
	return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 211 ms 16632 KB Output is correct
3 Correct 183 ms 16644 KB Output is correct
4 Correct 230 ms 16576 KB Output is correct
5 Correct 219 ms 17216 KB Output is correct
6 Correct 211 ms 17668 KB Output is correct
7 Correct 227 ms 17764 KB Output is correct
8 Correct 256 ms 23868 KB Output is correct
9 Correct 246 ms 23852 KB Output is correct
10 Correct 268 ms 17024 KB Output is correct
11 Correct 264 ms 21024 KB Output is correct
12 Correct 115 ms 19428 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 2 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 2 ms 468 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 1 ms 340 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 2 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 2 ms 468 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 468 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 2 ms 468 KB Output is correct
17 Correct 2 ms 468 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 44 ms 1740 KB Output is correct
20 Correct 31 ms 1584 KB Output is correct
21 Correct 32 ms 1936 KB Output is correct
22 Correct 25 ms 1984 KB Output is correct
23 Correct 32 ms 2100 KB Output is correct
24 Correct 24 ms 2120 KB Output is correct
25 Correct 37 ms 1728 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 2 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 2 ms 468 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 468 KB Output is correct
13 Correct 2 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 2 ms 468 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 182 ms 15992 KB Output is correct
20 Correct 160 ms 16064 KB Output is correct
21 Correct 191 ms 16024 KB Output is correct
22 Correct 196 ms 19844 KB Output is correct
23 Correct 256 ms 24780 KB Output is correct
24 Correct 273 ms 24792 KB Output is correct
25 Correct 33 ms 11096 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 176 ms 16652 KB Output is correct
2 Correct 217 ms 16652 KB Output is correct
3 Correct 207 ms 16704 KB Output is correct
4 Correct 225 ms 23952 KB Output is correct
5 Correct 222 ms 17056 KB Output is correct
6 Correct 285 ms 23624 KB Output is correct
7 Correct 286 ms 26672 KB Output is correct
8 Correct 283 ms 26808 KB Output is correct
9 Correct 255 ms 24764 KB Output is correct
10 Correct 288 ms 26304 KB Output is correct
11 Correct 269 ms 26016 KB Output is correct
12 Correct 303 ms 26400 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 211 ms 16632 KB Output is correct
3 Correct 183 ms 16644 KB Output is correct
4 Correct 230 ms 16576 KB Output is correct
5 Correct 219 ms 17216 KB Output is correct
6 Correct 211 ms 17668 KB Output is correct
7 Correct 227 ms 17764 KB Output is correct
8 Correct 256 ms 23868 KB Output is correct
9 Correct 246 ms 23852 KB Output is correct
10 Correct 268 ms 17024 KB Output is correct
11 Correct 264 ms 21024 KB Output is correct
12 Correct 115 ms 19428 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 2 ms 468 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 2 ms 468 KB Output is correct
18 Correct 2 ms 468 KB Output is correct
19 Correct 2 ms 468 KB Output is correct
20 Correct 2 ms 468 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 468 KB Output is correct
25 Correct 1 ms 468 KB Output is correct
26 Correct 1 ms 468 KB Output is correct
27 Correct 1 ms 468 KB Output is correct
28 Correct 2 ms 468 KB Output is correct
29 Correct 2 ms 468 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 44 ms 1740 KB Output is correct
32 Correct 31 ms 1584 KB Output is correct
33 Correct 32 ms 1936 KB Output is correct
34 Correct 25 ms 1984 KB Output is correct
35 Correct 32 ms 2100 KB Output is correct
36 Correct 24 ms 2120 KB Output is correct
37 Correct 37 ms 1728 KB Output is correct
38 Correct 0 ms 340 KB Output is correct
39 Correct 1 ms 340 KB Output is correct
40 Correct 1 ms 468 KB Output is correct
41 Correct 2 ms 468 KB Output is correct
42 Correct 1 ms 468 KB Output is correct
43 Correct 1 ms 468 KB Output is correct
44 Correct 1 ms 468 KB Output is correct
45 Correct 2 ms 468 KB Output is correct
46 Correct 1 ms 340 KB Output is correct
47 Correct 182 ms 15992 KB Output is correct
48 Correct 160 ms 16064 KB Output is correct
49 Correct 191 ms 16024 KB Output is correct
50 Correct 196 ms 19844 KB Output is correct
51 Correct 256 ms 24780 KB Output is correct
52 Correct 273 ms 24792 KB Output is correct
53 Correct 33 ms 11096 KB Output is correct
54 Correct 176 ms 16652 KB Output is correct
55 Correct 217 ms 16652 KB Output is correct
56 Correct 207 ms 16704 KB Output is correct
57 Correct 225 ms 23952 KB Output is correct
58 Correct 222 ms 17056 KB Output is correct
59 Correct 285 ms 23624 KB Output is correct
60 Correct 286 ms 26672 KB Output is correct
61 Correct 283 ms 26808 KB Output is correct
62 Correct 255 ms 24764 KB Output is correct
63 Correct 288 ms 26304 KB Output is correct
64 Correct 269 ms 26016 KB Output is correct
65 Correct 303 ms 26400 KB Output is correct
66 Correct 1 ms 336 KB Output is correct
67 Correct 198 ms 19888 KB Output is correct
68 Correct 199 ms 19704 KB Output is correct
69 Correct 257 ms 19748 KB Output is correct
70 Correct 208 ms 20376 KB Output is correct
71 Correct 266 ms 20740 KB Output is correct
72 Correct 216 ms 21016 KB Output is correct
73 Correct 238 ms 27044 KB Output is correct
74 Correct 239 ms 26944 KB Output is correct
75 Correct 218 ms 20208 KB Output is correct
76 Correct 259 ms 24080 KB Output is correct
77 Correct 123 ms 19520 KB Output is correct
78 Correct 0 ms 340 KB Output is correct
79 Correct 2 ms 468 KB Output is correct
80 Correct 1 ms 468 KB Output is correct
81 Correct 2 ms 468 KB Output is correct
82 Correct 2 ms 468 KB Output is correct
83 Correct 3 ms 596 KB Output is correct
84 Correct 3 ms 468 KB Output is correct
85 Correct 1 ms 340 KB Output is correct
86 Correct 34 ms 2640 KB Output is correct
87 Correct 33 ms 2696 KB Output is correct
88 Correct 38 ms 2824 KB Output is correct
89 Correct 29 ms 2932 KB Output is correct
90 Correct 39 ms 3168 KB Output is correct
91 Correct 29 ms 3120 KB Output is correct
92 Correct 36 ms 2864 KB Output is correct
93 Correct 217 ms 18044 KB Output is correct
94 Correct 224 ms 17248 KB Output is correct
95 Correct 206 ms 17940 KB Output is correct
96 Correct 219 ms 21756 KB Output is correct
97 Correct 261 ms 24768 KB Output is correct
98 Correct 272 ms 24712 KB Output is correct
99 Correct 37 ms 11124 KB Output is correct
100 Correct 298 ms 26668 KB Output is correct
101 Correct 347 ms 26692 KB Output is correct
102 Correct 275 ms 26700 KB Output is correct
103 Correct 305 ms 26200 KB Output is correct
104 Correct 270 ms 26180 KB Output is correct
105 Correct 274 ms 26284 KB Output is correct
106 Correct 199 ms 17964 KB Output is correct
107 Correct 224 ms 19424 KB Output is correct
108 Correct 213 ms 19828 KB Output is correct
109 Correct 197 ms 19820 KB Output is correct
110 Correct 303 ms 26680 KB Output is correct
111 Correct 282 ms 26564 KB Output is correct