oj.uz

Submission #593968

# Submission time Handle Problem Language Result Execution time Memory
593968 2022-07-11T18:30:11 Z CaroLinda Event Hopping (BOI22_events) C++14
100 / 100
 142 ms 10512 KB 
#include <bits/stdc++.h>

//bad complexity to test idea

#define ll long long

const int MAXN = 1e5+10;
const int LOG = 20;

using namespace std;

int N, Q;
int S[MAXN], E[MAXN];
int dp[LOG][MAXN];


void findNxtArray(){
	for(int i = 0; i < LOG; i++)
		for(int j = 1; j <= N; j++)
			dp[i][j] = -1;

	vector<int> sweep(N);
	iota(sweep.begin(),sweep.end(), 1);

	sort(sweep.begin(),sweep.end(), [&](int a, int b){
		if(E[a] != E[b])
			return E[a] < E[b];
		return S[a] < S[b];
	});

	vector< pair<int,int> > s;

	for(auto &i : sweep){
		bool coloca = true;

		while(!s.empty()){
			int last = s.back().second;

			if(S[last] >= S[i]){
				s.pop_back();
			}
			else{
				if(E[last] == E[i]){
					coloca = false;
				}
				break;
			}
		}

		if(coloca)
			s.push_back(make_pair(E[i], i));

		int val = lower_bound(s.begin(),s.end(), make_pair(S[i],-1))->second;
		dp[0][i] = (val == i) ? -1 : val;
	}

	for(int i = 1; i < LOG; i++)
		for(int j = 1; j <= N; j++)
			if(dp[i-1][j] != -1)
				dp[i][j] = dp[i-1][ dp[i-1][j] ];
}

bool isInside(int a, int b){
	return E[a] >= S[b] && E[a] <= E[b];
}

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0);

	cin >> N >> Q;
	for(int i = 1; i <= N; i++)
		cin >> S[i] >> E[i];

	findNxtArray();

	for(int i = 1, a, b; i <= Q; i++){
		cin >> a >> b;

		if(isInside(a,b)){
			cout << (a != b) << "\n";
			continue;
		}
		if(E[a] > S[b]){
			cout << "impossible\n";
			continue;
		}

		int ans = 0;

		for(int i = LOG-1; i >= 0 && !isInside(a,b); i--){
			if(dp[i][b] == -1)
				continue;
			if(S[dp[i][b]] > E[a]){
				ans += (1<<i);
				b = dp[i][b];
			}
		}

		b = dp[0][b];
		ans++;

		ans += (a != b);

		if(b == -1 || !isInside(a,b) ){
			cout << "impossible\n";
		}
		else cout << ans << "\n";
	} 
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 65 ms 10432 KB Output is correct
3 Correct 81 ms 10460 KB Output is correct
4 Correct 142 ms 10464 KB Output is correct
5 Correct 82 ms 10388 KB Output is correct
6 Correct 89 ms 10468 KB Output is correct
7 Correct 94 ms 10512 KB Output is correct
8 Correct 72 ms 10484 KB Output is correct
9 Correct 60 ms 10468 KB Output is correct
10 Correct 107 ms 10372 KB Output is correct
11 Correct 96 ms 9948 KB Output is correct
12 Correct 50 ms 10044 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 468 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 1 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 1 ms 480 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 33 ms 1332 KB Output is correct
20 Correct 31 ms 1412 KB Output is correct
21 Correct 30 ms 1628 KB Output is correct
22 Correct 31 ms 1688 KB Output is correct
23 Correct 32 ms 1384 KB Output is correct
24 Correct 20 ms 1576 KB Output is correct
25 Correct 30 ms 1228 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 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 1 ms 468 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 40 ms 10452 KB Output is correct
20 Correct 34 ms 10492 KB Output is correct
21 Correct 37 ms 9292 KB Output is correct
22 Correct 41 ms 9936 KB Output is correct
23 Correct 38 ms 10372 KB Output is correct
24 Correct 39 ms 10444 KB Output is correct
25 Correct 28 ms 9324 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 68 ms 10488 KB Output is correct
2 Correct 107 ms 10480 KB Output is correct
3 Correct 136 ms 10476 KB Output is correct
4 Correct 72 ms 10444 KB Output is correct
5 Correct 90 ms 10484 KB Output is correct
6 Correct 107 ms 10484 KB Output is correct
7 Correct 94 ms 10476 KB Output is correct
8 Correct 74 ms 10488 KB Output is correct
9 Correct 37 ms 10456 KB Output is correct
10 Correct 77 ms 10484 KB Output is correct
11 Correct 72 ms 10496 KB Output is correct
12 Correct 81 ms 10444 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 65 ms 10432 KB Output is correct
3 Correct 81 ms 10460 KB Output is correct
4 Correct 142 ms 10464 KB Output is correct
5 Correct 82 ms 10388 KB Output is correct
6 Correct 89 ms 10468 KB Output is correct
7 Correct 94 ms 10512 KB Output is correct
8 Correct 72 ms 10484 KB Output is correct
9 Correct 60 ms 10468 KB Output is correct
10 Correct 107 ms 10372 KB Output is correct
11 Correct 96 ms 9948 KB Output is correct
12 Correct 50 ms 10044 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 1 ms 468 KB Output is correct
20 Correct 1 ms 468 KB Output is correct
21 Correct 1 ms 468 KB Output is correct
22 Correct 0 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 480 KB Output is correct
28 Correct 1 ms 468 KB Output is correct
29 Correct 1 ms 468 KB Output is correct
30 Correct 1 ms 468 KB Output is correct
31 Correct 33 ms 1332 KB Output is correct
32 Correct 31 ms 1412 KB Output is correct
33 Correct 30 ms 1628 KB Output is correct
34 Correct 31 ms 1688 KB Output is correct
35 Correct 32 ms 1384 KB Output is correct
36 Correct 20 ms 1576 KB Output is correct
37 Correct 30 ms 1228 KB Output is correct
38 Correct 0 ms 340 KB Output is correct
39 Correct 0 ms 340 KB Output is correct
40 Correct 1 ms 468 KB Output is correct
41 Correct 1 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 1 ms 468 KB Output is correct
46 Correct 1 ms 468 KB Output is correct
47 Correct 40 ms 10452 KB Output is correct
48 Correct 34 ms 10492 KB Output is correct
49 Correct 37 ms 9292 KB Output is correct
50 Correct 41 ms 9936 KB Output is correct
51 Correct 38 ms 10372 KB Output is correct
52 Correct 39 ms 10444 KB Output is correct
53 Correct 28 ms 9324 KB Output is correct
54 Correct 68 ms 10488 KB Output is correct
55 Correct 107 ms 10480 KB Output is correct
56 Correct 136 ms 10476 KB Output is correct
57 Correct 72 ms 10444 KB Output is correct
58 Correct 90 ms 10484 KB Output is correct
59 Correct 107 ms 10484 KB Output is correct
60 Correct 94 ms 10476 KB Output is correct
61 Correct 74 ms 10488 KB Output is correct
62 Correct 37 ms 10456 KB Output is correct
63 Correct 77 ms 10484 KB Output is correct
64 Correct 72 ms 10496 KB Output is correct
65 Correct 81 ms 10444 KB Output is correct
66 Correct 1 ms 340 KB Output is correct
67 Correct 66 ms 10444 KB Output is correct
68 Correct 84 ms 10364 KB Output is correct
69 Correct 140 ms 10484 KB Output is correct
70 Correct 90 ms 10452 KB Output is correct
71 Correct 86 ms 10456 KB Output is correct
72 Correct 83 ms 10444 KB Output is correct
73 Correct 63 ms 10368 KB Output is correct
74 Correct 82 ms 10456 KB Output is correct
75 Correct 115 ms 10404 KB Output is correct
76 Correct 107 ms 10056 KB Output is correct
77 Correct 51 ms 10132 KB Output is correct
78 Correct 1 ms 360 KB Output is correct
79 Correct 1 ms 468 KB Output is correct
80 Correct 1 ms 468 KB Output is correct
81 Correct 1 ms 468 KB Output is correct
82 Correct 1 ms 468 KB Output is correct
83 Correct 1 ms 468 KB Output is correct
84 Correct 1 ms 468 KB Output is correct
85 Correct 1 ms 464 KB Output is correct
86 Correct 45 ms 1336 KB Output is correct
87 Correct 36 ms 1400 KB Output is correct
88 Correct 37 ms 1708 KB Output is correct
89 Correct 24 ms 1612 KB Output is correct
90 Correct 23 ms 1492 KB Output is correct
91 Correct 30 ms 1500 KB Output is correct
92 Correct 31 ms 1240 KB Output is correct
93 Correct 37 ms 10408 KB Output is correct
94 Correct 33 ms 10476 KB Output is correct
95 Correct 39 ms 9316 KB Output is correct
96 Correct 45 ms 9936 KB Output is correct
97 Correct 46 ms 10440 KB Output is correct
98 Correct 40 ms 10440 KB Output is correct
99 Correct 24 ms 9300 KB Output is correct
100 Correct 89 ms 10380 KB Output is correct
101 Correct 90 ms 10444 KB Output is correct
102 Correct 75 ms 10456 KB Output is correct
103 Correct 82 ms 10472 KB Output is correct
104 Correct 84 ms 10480 KB Output is correct
105 Correct 75 ms 10480 KB Output is correct
106 Correct 94 ms 10508 KB Output is correct
107 Correct 110 ms 10392 KB Output is correct
108 Correct 71 ms 9720 KB Output is correct
109 Correct 68 ms 9620 KB Output is correct
110 Correct 61 ms 9468 KB Output is correct
111 Correct 66 ms 9452 KB Output is correct