oj.uz

Submission #1111520

# Submission time Handle Problem Language Result Execution time Memory
1111520 2024-11-12T09:14:22 Z hmm789 Fire (BOI24_fire) C++14
0 / 100
 1174 ms 468772 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long 
#define INF 1000000000000000000

struct node {
	int s, e, m, v, lz;
	node *l, *r;
	node(int _s, int _e) {
		s = _s, e = _e, m = (s+e)/2, v = 0, lz = -1;
		if(s != e) {
			l = new node(s, m);
			r = new node(m+1, e);
		}
	}
	void prop() {
		if(lz == -1) return;
		v = lz;
		if(s != e) {
			l->lz = lz;
			r->lz = lz;
		}
		lz = -1;
	}
	void update(int x, int y, int val) {
		prop();
		if(x <= s && e <= y) {lz = val; return;}
		else if(x > m) r->update(x, y, val);
		else if(y <= m) l->update(x, y, val);
		else l->update(x, y, val), r->update(x, y, val);
		l->prop(); r->prop();
		v = max(l->v, r->v);
	}
	int get(int x) {
		prop();
		if(s == e) return v;
		else if(x > m) return r->get(x);
		else return l->get(x);
	}
} *root, *root2;

vector<int> adj[200000];
int p[200000][18], depth[200000];

void dfs(int x, int pa, int d) {
	depth[x] = d;
	p[x][0] = pa;
	for(int i = 1; i < 18; i++) {
		if(p[x][i-1] == -1) break;
		p[x][i] = p[p[x][i-1]][i-1];
	}
	for(int i : adj[x]) dfs(i, x, d+1);
}

int getp(int x, int k) {
	for(int i = 0; i < 18; i++) {
		if(k&(1<<i)) x = p[x][i];
	}
	return x;
}

int32_t main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	int n, m, x, y, mn = INF, mx = 0;
	cin >> n >> m;
	pair<int, int> a[n];
	vector<int> dis, dis2, act;
	for(int i = 0; i < n; i++) {
		cin >> x >> y;
		if(y < x) y = y+m;
		a[i] = {y, x};
		dis.push_back(x);
		dis.push_back(y);
		dis2.push_back(x);
		dis2.push_back(x-1);
		dis2.push_back(x+1);
		dis2.push_back(y);
		dis2.push_back(y-1);
		dis2.push_back(y+1);
		mn = min(mn, x);
		mx = max(mx, y);
	}
	if(mx-mn < m) {
		cout << -1 << '\n';
		return 0;
	}
	sort(dis.begin(), dis.end());
	dis.erase(unique(dis.begin(), dis.end()), dis.end());
	sort(dis2.begin(), dis2.end());
	dis2.erase(unique(dis2.begin(), dis2.end()), dis2.end());
	for(int i : dis) act.push_back(i);
	root = new node(0, dis.size());
	root2 = new node(0, dis2.size());
	
	for(int i = 0; i < n; i++) {
		x = lower_bound(dis2.begin(), dis2.end(), a[i].second)-dis2.begin();
		y = lower_bound(dis2.begin(), dis2.end(), a[i].first)-dis2.begin();
		root2->update(x, y, 1);
		
		a[i].first = lower_bound(dis.begin(), dis.end(), a[i].first)-dis.begin();
		a[i].second = lower_bound(dis.begin(), dis.end(), a[i].second)-dis.begin();
	}
	
	sort(a, a+n);
	for(int i = 0; i < n; i++) {
		root->update(a[i].second, a[i].first, a[i].first);
	}
	for(int i = 1; i < dis2.size()-1; i++) if(!root2->get(i)) {
		cout << -1 << '\n';
		return 0;
	}
	for(int i = 0; i < dis.size(); i++) {
		if(root->get(i) != i) adj[root->get(i)].push_back(i);
	}
	memset(p, -1, sizeof(p));
	dfs(dis.size()-1, -1, 0);
	int l = 0, r = n, md;
	while(l < r) {
		md = (l+r)/2;
		bool ok = false;
		for(int i = 0; i < dis.size()-1; i++) {
			if(act[getp(i, min(md, depth[i]))]-act[i] >= m) ok = true;
		}
		if(ok) r = md;
		else l = md+1;
	}
	cout << l << '\n';
}

Compilation message

Main.cpp: In function 'int32_t main()':
Main.cpp:109:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  109 |  for(int i = 1; i < dis2.size()-1; i++) if(!root2->get(i)) {
      |                 ~~^~~~~~~~~~~~~~~
Main.cpp:113:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  113 |  for(int i = 0; i < dis.size(); i++) {
      |                 ~~^~~~~~~~~~~~
Main.cpp:122:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  122 |   for(int i = 0; i < dis.size()-1; i++) {
      |                  ~~^~~~~~~~~~~~~~

Subtask #1
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 34640 KB Output is correct
2 Correct 2 ms 5968 KB Output is correct
3 Incorrect 2 ms 5968 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 34640 KB Output is correct
2 Correct 2 ms 5968 KB Output is correct
3 Incorrect 2 ms 5968 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 34640 KB Output is correct
2 Correct 2 ms 5968 KB Output is correct
3 Incorrect 2 ms 5968 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6136 KB Output is correct
2 Correct 5 ms 34640 KB Output is correct
3 Correct 5 ms 34712 KB Output is correct
4 Correct 5 ms 34640 KB Output is correct
5 Correct 6 ms 34640 KB Output is correct
6 Correct 2 ms 5968 KB Output is correct
7 Correct 2 ms 5968 KB Output is correct
8 Correct 6 ms 34640 KB Output is correct
9 Correct 7 ms 34908 KB Output is correct
10 Correct 6 ms 34964 KB Output is correct
11 Correct 7 ms 34896 KB Output is correct
12 Correct 7 ms 34896 KB Output is correct
13 Correct 7 ms 34952 KB Output is correct
14 Correct 7 ms 34896 KB Output is correct
15 Correct 23 ms 40376 KB Output is correct
16 Correct 20 ms 38040 KB Output is correct
17 Correct 16 ms 37200 KB Output is correct
18 Correct 19 ms 37968 KB Output is correct
19 Correct 22 ms 40272 KB Output is correct
20 Correct 83 ms 56356 KB Output is correct
21 Runtime error 1174 ms 468772 KB Execution killed with signal 11
22 Halted 0 ms 0 KB -

Subtask #5
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 5984 KB Output is correct
2 Correct 5 ms 34716 KB Output is correct
3 Correct 6 ms 34652 KB Output is correct
4 Correct 6 ms 34644 KB Output is correct
5 Correct 2 ms 5968 KB Output is correct
6 Correct 2 ms 5968 KB Output is correct
7 Correct 2 ms 5968 KB Output is correct
8 Correct 6 ms 34896 KB Output is correct
9 Correct 6 ms 34896 KB Output is correct
10 Correct 7 ms 34896 KB Output is correct
11 Correct 6 ms 35148 KB Output is correct
12 Correct 23 ms 40272 KB Output is correct
13 Correct 19 ms 37968 KB Output is correct
14 Correct 23 ms 37968 KB Output is correct
15 Correct 97 ms 56132 KB Output is correct
16 Runtime error 713 ms 265172 KB Execution killed with signal 11
17 Halted 0 ms 0 KB -

Subtask #6
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 34640 KB Output is correct
2 Correct 2 ms 5968 KB Output is correct
3 Incorrect 2 ms 5968 KB Output isn't correct
4 Halted 0 ms 0 KB -