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Submission #588704

# Submission time Handle Problem Language Result Execution time Memory
588704 2022-07-03T21:48:50 Z peuch Event Hopping (BOI22_events) C++17
20 / 100
 91 ms 14068 KB 
#include<bits/stdc++.h>
using namespace std;
 
const int MAXN = 1e5 + 10;
const int INF = 1e9;
 
int n, q;
int s[MAXN], e[MAXN];
int ans[MAXN];
 
struct event{
	int s, e, id;
	event(int _s, int _e, int _id) {
		s = _s;
		e = _e;
		id = _id;
	}
	bool operator < (event x){
		if(e == x.e) return s < x.s;
		return e < x.e;
	}
};
 
struct query{
	int l, r, id;
	query(int _l, int _r, int _id){
		l = _l;
		r = _r;
		id = _id;
	}
};
 
vector<query> ar[MAXN];
 
vector<event> line;
int point[MAXN];
vector<vector<int> > dist;
 
int main(){
	scanf("%d %d", &n, &q);
	for(int i = 1; i <= n; i++){
		scanf("%d %d", &s[i], &e[i]);
		line.push_back(event(s[i], e[i], i));
	}
	for(int i = 1; i <= q; i++){
		int ini, fim;
		scanf("%d %d", &ini, &fim);
		ans[i] = INF;
		if(ini == fim) ans[i] = 0;
		else ar[fim].push_back(query(e[ini], e[fim], i));
	}
	
	sort(line.begin(), line.end());
	
	vector<int> pilha;
	for(int i = 0; i < line.size(); i++){
		while(!pilha.empty() && line[pilha.back()].s >= line[i].s){
			pilha.pop_back();
		}
		pilha.push_back(i);
		
		int ini = 0, fim = pilha.size() - 1;
		while(ini != fim){
			int mid = (ini + fim) >> 1;
			if(line[pilha[mid]].e >= line[i].s) fim = mid;
			else ini = mid + 1;
		}
		ini = pilha[ini];
		if(ini == i){
			point[i] = dist.size();
			dist.push_back(vector<int> (0));
		}
		else point[i] = point[ini];
		while(dist[point[i]].size() != 0 && dist[point[i]].back() > line[ini].s)
			dist[point[i]].pop_back();
		dist[point[i]].push_back(line[i].s);
		for(int j = 0; j < ar[line[i].id].size(); j++){
			if(ar[line[i].id][j].l > ar[line[i].id][j].r) continue;
			int k = upper_bound(dist[point[i]].begin(), dist[point[i]].end(), ar[line[i].id][j].l) - dist[point[i]].begin() - 1;
			if(k < 0) continue;
			ans[ar[line[i].id][j].id] = dist[point[i]].size() - k;
		}
	}
	
	for(int i = 1; i <= q; i++){
		if(ans[i] == INF) printf("impossible\n");
		else printf("%d\n", ans[i]);
	}
}

Compilation message

events.cpp: In function 'int main()':
events.cpp:56:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<event>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   56 |  for(int i = 0; i < line.size(); i++){
      |                 ~~^~~~~~~~~~~~~
events.cpp:77:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<query>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   77 |   for(int j = 0; j < ar[line[i].id].size(); j++){
      |                  ~~^~~~~~~~~~~~~~~~~~~~~~~
events.cpp:40:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |  scanf("%d %d", &n, &q);
      |  ~~~~~^~~~~~~~~~~~~~~~~
events.cpp:42:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |   scanf("%d %d", &s[i], &e[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~
events.cpp:47:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |   scanf("%d %d", &ini, &fim);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 66 ms 8300 KB Output is correct
3 Correct 67 ms 8776 KB Output is correct
4 Correct 76 ms 8776 KB Output is correct
5 Correct 91 ms 9332 KB Output is correct
6 Correct 73 ms 10172 KB Output is correct
7 Correct 67 ms 9940 KB Output is correct
8 Correct 68 ms 13952 KB Output is correct
9 Correct 75 ms 13924 KB Output is correct
10 Correct 88 ms 9620 KB Output is correct
11 Correct 79 ms 11764 KB Output is correct
12 Correct 54 ms 13340 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct
7 Correct 2 ms 2644 KB Output is correct
8 Correct 2 ms 2644 KB Output is correct
9 Correct 2 ms 2644 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct
7 Correct 2 ms 2644 KB Output is correct
8 Correct 2 ms 2644 KB Output is correct
9 Correct 2 ms 2644 KB Output is correct
10 Correct 1 ms 2644 KB Output is correct
11 Correct 1 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 2 ms 2644 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 3 ms 2644 KB Output is correct
16 Correct 2 ms 2644 KB Output is correct
17 Correct 2 ms 2644 KB Output is correct
18 Correct 2 ms 2644 KB Output is correct
19 Correct 32 ms 5244 KB Output is correct
20 Correct 42 ms 5392 KB Output is correct
21 Correct 36 ms 5972 KB Output is correct
22 Incorrect 35 ms 6104 KB Output isn't correct
23 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct
7 Correct 2 ms 2644 KB Output is correct
8 Correct 2 ms 2644 KB Output is correct
9 Correct 2 ms 2644 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 2 ms 2644 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 2 ms 2644 KB Output is correct
16 Correct 3 ms 2644 KB Output is correct
17 Correct 2 ms 2644 KB Output is correct
18 Correct 2 ms 2644 KB Output is correct
19 Correct 40 ms 6196 KB Output is correct
20 Correct 38 ms 6144 KB Output is correct
21 Incorrect 40 ms 8004 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 69 ms 8336 KB Output is correct
2 Correct 69 ms 8840 KB Output is correct
3 Correct 76 ms 8764 KB Output is correct
4 Correct 71 ms 14068 KB Output is correct
5 Correct 88 ms 9716 KB Output is correct
6 Incorrect 82 ms 9024 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 66 ms 8300 KB Output is correct
3 Correct 67 ms 8776 KB Output is correct
4 Correct 76 ms 8776 KB Output is correct
5 Correct 91 ms 9332 KB Output is correct
6 Correct 73 ms 10172 KB Output is correct
7 Correct 67 ms 9940 KB Output is correct
8 Correct 68 ms 13952 KB Output is correct
9 Correct 75 ms 13924 KB Output is correct
10 Correct 88 ms 9620 KB Output is correct
11 Correct 79 ms 11764 KB Output is correct
12 Correct 54 ms 13340 KB Output is correct
13 Correct 1 ms 2644 KB Output is correct
14 Correct 1 ms 2644 KB Output is correct
15 Correct 2 ms 2644 KB Output is correct
16 Correct 2 ms 2644 KB Output is correct
17 Correct 2 ms 2644 KB Output is correct
18 Correct 2 ms 2644 KB Output is correct
19 Correct 2 ms 2644 KB Output is correct
20 Correct 2 ms 2644 KB Output is correct
21 Correct 2 ms 2644 KB Output is correct
22 Correct 1 ms 2644 KB Output is correct
23 Correct 1 ms 2644 KB Output is correct
24 Correct 2 ms 2644 KB Output is correct
25 Correct 2 ms 2644 KB Output is correct
26 Correct 2 ms 2644 KB Output is correct
27 Correct 3 ms 2644 KB Output is correct
28 Correct 2 ms 2644 KB Output is correct
29 Correct 2 ms 2644 KB Output is correct
30 Correct 2 ms 2644 KB Output is correct
31 Correct 32 ms 5244 KB Output is correct
32 Correct 42 ms 5392 KB Output is correct
33 Correct 36 ms 5972 KB Output is correct
34 Incorrect 35 ms 6104 KB Output isn't correct
35 Halted 0 ms 0 KB -