oj.uz

Submission #577520

# Submission time Handle Problem Language Result Execution time Memory
577520 2022-06-15T03:41:04 Z jiahng Event Hopping (BOI22_events) C++14
100 / 100
 887 ms 187464 KB 
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
#define ll int
//~ #define int ll
typedef pair<int32_t, int32_t> pi;
typedef vector <int> vi;
typedef vector <pi> vpi;
typedef pair<pi, ll> pii;
typedef set <ll> si;
typedef long double ld;
#define f first
#define s second
#define mp make_pair
#define FOR(i,s,e) for(int i=s;i<=int(e);++i)
#define DEC(i,s,e) for(int i=s;i>=int(e);--i)
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define lbd(x, y) lower_bound(all(x), y)
#define ubd(x, y) upper_bound(all(x), y)
#define aFOR(i,x) for (auto i: x)
#define mem(x,i) memset(x,i,sizeof x)
#define fast ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0)
#define maxn 2000010
#define INF (ll)1e9
#define MOD 1000000007
typedef pair <vi, int> pvi;
typedef pair <int,pi> ipi;
typedef vector <pii> vpii;

int N,Q;
int S[maxn],E[maxn],s,e;

vpii queries[maxn];
const int sqrtn = 1000;
vi A[maxn];

vi adj[maxn];
int par[maxn], twok[maxn][21];
bool vis[maxn];

struct node{
	int s,e,m;
	pi val = pi(INF,INF), lazy=pi(INF,INF);
	node *l,*r;
	
	node(int ss,int ee){
		s = ss; e = ee; m = (s + e) / 2;
		if (s != e){
			l = new node(s,m); r = new node(m+1,e);
		}
	}
	void prop(){
		if (s == e || lazy == pi(INF,INF)) return;
		l->lazy = min(l->lazy, lazy); r->lazy = min(r->lazy, lazy);
		l->val = min(l->val, lazy); r->val = min(r->val, lazy);
		lazy = pi(INF,INF);
	}
	void upd(int a,int b,pi c){
		prop();
		if (a <= s && e <= b){
			val = min(val, c); lazy = min(lazy, c);
		}else if (a > e || s > b) return;
		else{
			l->upd(a,b,c); r->upd(a,b,c);
			val = min(l->val, r->val);
		}
	}
	pi qry(int a,int b){
		prop();
		if (a <= s && e <= b) return val;
		else if (a > e || s > b) return pi(INF,INF);
		else return min(l->qry(a,b), r->qry(a,b));
	}
}*root;

void dfs(int x, int p){
	twok[x][0] = p;
	vis[x] = 1;
	FOR(i,1,20){
		if (twok[x][i-1] == -1) break;
		twok[x][i] = twok[twok[x][i-1]][i-1];
	}
	aFOR(i,adj[x]) dfs(i,x);
}
int ans[maxn];
void solve(){
	cin >> N >> Q;
	vi v;
	FOR(i,1,N){
		cin >> S[i] >> E[i];
		v.pb(S[i]); v.pb(E[i]);
	}
	sort(all(v)); v.erase(unique(all(v)), v.end());
	FOR(i,1,N){
		S[i] = lbd(v, S[i]) - v.begin() + 1;
		E[i] = lbd(v, E[i]) - v.begin() + 1;
	}
	FOR(i,1,N) A[E[i]].pb(i);
	//~ cout << A[7].size();
	//~ return;
	//~ FOR(i,1,N){
		//~ cout << S[i] << ' ' << E[i] << '\n';
	//~ }
	//~ return;
	//~ FOR(i,1,Q){
		//~ cin >> s >> e;
		//~ if (s == e) ans[i] = 0;
		//~ else if (S[e] <= E[s] && E[s] <= E[e]) ans[i] = 1;
		//~ else queries[E[e]].pb(pii(pi(s,e), i));
	//~ }

	root = new node(1,2*N);
	//~ root->upd(1,1,pi(1,1
	FOR(i,1,N) root->upd(E[i], E[i], pi(S[i], i));
	FOR(i,1,N){
		par[i] = root->qry(S[i], E[i]).s;
		if (par[i] == i) par[i] = -1;
		else adj[par[i]].pb(i);
		//~ cout << par[i] << ' ';
	}
	//~ cout << '\n';
	FOR(i,1,N) if (!vis[i]) dfs(i,-1);
	
	FOR(i,1,Q){
		cin >> s >> e;
		if (s == e) cout << 0;
		else if (S[e] <= E[s] && E[s] <= E[e]) cout << 1;
		else{
			int x = e, ans = 0;
			DEC(k,20,0) if (twok[x][k] != -1 && S[twok[x][k]] > E[s]){
				x = twok[x][k]; ans += (1<<k);
			}
			
			if (par[x] == -1) cout << "impossible";
			else{
				x = par[x];
				if (S[x] <= E[s] && E[s] <= E[x]) cout << ans + 2;
				else cout << "impossible";
			}
		}
		cout << '\n';
	}
}
				
int32_t main(){
	fast;
	//~ cin >> TC;
	//~ while (TC--) solve();
	solve();
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 68 ms 141160 KB Output is correct
2 Correct 787 ms 186512 KB Output is correct
3 Correct 605 ms 186576 KB Output is correct
4 Correct 887 ms 186652 KB Output is correct
5 Correct 612 ms 186064 KB Output is correct
6 Correct 495 ms 185388 KB Output is correct
7 Correct 632 ms 185288 KB Output is correct
8 Correct 296 ms 180756 KB Output is correct
9 Correct 295 ms 180904 KB Output is correct
10 Correct 534 ms 185276 KB Output is correct
11 Correct 443 ms 183716 KB Output is correct
12 Correct 186 ms 180804 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 79 ms 141224 KB Output is correct
2 Correct 74 ms 141256 KB Output is correct
3 Correct 77 ms 141600 KB Output is correct
4 Correct 72 ms 141644 KB Output is correct
5 Correct 82 ms 141664 KB Output is correct
6 Correct 72 ms 141576 KB Output is correct
7 Correct 72 ms 141648 KB Output is correct
8 Correct 72 ms 141596 KB Output is correct
9 Correct 71 ms 141724 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 79 ms 141224 KB Output is correct
2 Correct 74 ms 141256 KB Output is correct
3 Correct 77 ms 141600 KB Output is correct
4 Correct 72 ms 141644 KB Output is correct
5 Correct 82 ms 141664 KB Output is correct
6 Correct 72 ms 141576 KB Output is correct
7 Correct 72 ms 141648 KB Output is correct
8 Correct 72 ms 141596 KB Output is correct
9 Correct 71 ms 141724 KB Output is correct
10 Correct 71 ms 141248 KB Output is correct
11 Correct 71 ms 141256 KB Output is correct
12 Correct 73 ms 141640 KB Output is correct
13 Correct 72 ms 141644 KB Output is correct
14 Correct 72 ms 141644 KB Output is correct
15 Correct 72 ms 141516 KB Output is correct
16 Correct 71 ms 141528 KB Output is correct
17 Correct 70 ms 141644 KB Output is correct
18 Correct 72 ms 141616 KB Output is correct
19 Correct 107 ms 143756 KB Output is correct
20 Correct 103 ms 143916 KB Output is correct
21 Correct 116 ms 144192 KB Output is correct
22 Correct 102 ms 143872 KB Output is correct
23 Correct 98 ms 143788 KB Output is correct
24 Correct 96 ms 143948 KB Output is correct
25 Correct 103 ms 143732 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 79 ms 141224 KB Output is correct
2 Correct 74 ms 141256 KB Output is correct
3 Correct 77 ms 141600 KB Output is correct
4 Correct 72 ms 141644 KB Output is correct
5 Correct 82 ms 141664 KB Output is correct
6 Correct 72 ms 141576 KB Output is correct
7 Correct 72 ms 141648 KB Output is correct
8 Correct 72 ms 141596 KB Output is correct
9 Correct 71 ms 141724 KB Output is correct
10 Correct 72 ms 141248 KB Output is correct
11 Correct 74 ms 141188 KB Output is correct
12 Correct 73 ms 141660 KB Output is correct
13 Correct 74 ms 141608 KB Output is correct
14 Correct 73 ms 141700 KB Output is correct
15 Correct 73 ms 141536 KB Output is correct
16 Correct 72 ms 141552 KB Output is correct
17 Correct 75 ms 141628 KB Output is correct
18 Correct 74 ms 141628 KB Output is correct
19 Correct 506 ms 187464 KB Output is correct
20 Correct 822 ms 186100 KB Output is correct
21 Correct 278 ms 179196 KB Output is correct
22 Correct 434 ms 182824 KB Output is correct
23 Correct 317 ms 180808 KB Output is correct
24 Correct 464 ms 182872 KB Output is correct
25 Correct 143 ms 177844 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 790 ms 186456 KB Output is correct
2 Correct 618 ms 186460 KB Output is correct
3 Correct 853 ms 186564 KB Output is correct
4 Correct 312 ms 180804 KB Output is correct
5 Correct 548 ms 185288 KB Output is correct
6 Correct 530 ms 183620 KB Output is correct
7 Correct 561 ms 183616 KB Output is correct
8 Correct 453 ms 182196 KB Output is correct
9 Correct 315 ms 180596 KB Output is correct
10 Correct 472 ms 183232 KB Output is correct
11 Correct 384 ms 182344 KB Output is correct
12 Correct 517 ms 183312 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 68 ms 141160 KB Output is correct
2 Correct 787 ms 186512 KB Output is correct
3 Correct 605 ms 186576 KB Output is correct
4 Correct 887 ms 186652 KB Output is correct
5 Correct 612 ms 186064 KB Output is correct
6 Correct 495 ms 185388 KB Output is correct
7 Correct 632 ms 185288 KB Output is correct
8 Correct 296 ms 180756 KB Output is correct
9 Correct 295 ms 180904 KB Output is correct
10 Correct 534 ms 185276 KB Output is correct
11 Correct 443 ms 183716 KB Output is correct
12 Correct 186 ms 180804 KB Output is correct
13 Correct 79 ms 141224 KB Output is correct
14 Correct 74 ms 141256 KB Output is correct
15 Correct 77 ms 141600 KB Output is correct
16 Correct 72 ms 141644 KB Output is correct
17 Correct 82 ms 141664 KB Output is correct
18 Correct 72 ms 141576 KB Output is correct
19 Correct 72 ms 141648 KB Output is correct
20 Correct 72 ms 141596 KB Output is correct
21 Correct 71 ms 141724 KB Output is correct
22 Correct 71 ms 141248 KB Output is correct
23 Correct 71 ms 141256 KB Output is correct
24 Correct 73 ms 141640 KB Output is correct
25 Correct 72 ms 141644 KB Output is correct
26 Correct 72 ms 141644 KB Output is correct
27 Correct 72 ms 141516 KB Output is correct
28 Correct 71 ms 141528 KB Output is correct
29 Correct 70 ms 141644 KB Output is correct
30 Correct 72 ms 141616 KB Output is correct
31 Correct 107 ms 143756 KB Output is correct
32 Correct 103 ms 143916 KB Output is correct
33 Correct 116 ms 144192 KB Output is correct
34 Correct 102 ms 143872 KB Output is correct
35 Correct 98 ms 143788 KB Output is correct
36 Correct 96 ms 143948 KB Output is correct
37 Correct 103 ms 143732 KB Output is correct
38 Correct 72 ms 141248 KB Output is correct
39 Correct 74 ms 141188 KB Output is correct
40 Correct 73 ms 141660 KB Output is correct
41 Correct 74 ms 141608 KB Output is correct
42 Correct 73 ms 141700 KB Output is correct
43 Correct 73 ms 141536 KB Output is correct
44 Correct 72 ms 141552 KB Output is correct
45 Correct 75 ms 141628 KB Output is correct
46 Correct 74 ms 141628 KB Output is correct
47 Correct 506 ms 187464 KB Output is correct
48 Correct 822 ms 186100 KB Output is correct
49 Correct 278 ms 179196 KB Output is correct
50 Correct 434 ms 182824 KB Output is correct
51 Correct 317 ms 180808 KB Output is correct
52 Correct 464 ms 182872 KB Output is correct
53 Correct 143 ms 177844 KB Output is correct
54 Correct 790 ms 186456 KB Output is correct
55 Correct 618 ms 186460 KB Output is correct
56 Correct 853 ms 186564 KB Output is correct
57 Correct 312 ms 180804 KB Output is correct
58 Correct 548 ms 185288 KB Output is correct
59 Correct 530 ms 183620 KB Output is correct
60 Correct 561 ms 183616 KB Output is correct
61 Correct 453 ms 182196 KB Output is correct
62 Correct 315 ms 180596 KB Output is correct
63 Correct 472 ms 183232 KB Output is correct
64 Correct 384 ms 182344 KB Output is correct
65 Correct 517 ms 183312 KB Output is correct
66 Correct 72 ms 141132 KB Output is correct
67 Correct 793 ms 186584 KB Output is correct
68 Correct 611 ms 186680 KB Output is correct
69 Correct 863 ms 186556 KB Output is correct
70 Correct 605 ms 186032 KB Output is correct
71 Correct 483 ms 185412 KB Output is correct
72 Correct 682 ms 185216 KB Output is correct
73 Correct 296 ms 180732 KB Output is correct
74 Correct 294 ms 180832 KB Output is correct
75 Correct 564 ms 185764 KB Output is correct
76 Correct 448 ms 183688 KB Output is correct
77 Correct 186 ms 180696 KB Output is correct
78 Correct 74 ms 141156 KB Output is correct
79 Correct 73 ms 141704 KB Output is correct
80 Correct 73 ms 141564 KB Output is correct
81 Correct 72 ms 141656 KB Output is correct
82 Correct 72 ms 141576 KB Output is correct
83 Correct 77 ms 141668 KB Output is correct
84 Correct 72 ms 141516 KB Output is correct
85 Correct 72 ms 141548 KB Output is correct
86 Correct 107 ms 143764 KB Output is correct
87 Correct 108 ms 143920 KB Output is correct
88 Correct 115 ms 144224 KB Output is correct
89 Correct 102 ms 143964 KB Output is correct
90 Correct 100 ms 143852 KB Output is correct
91 Correct 99 ms 143844 KB Output is correct
92 Correct 101 ms 143564 KB Output is correct
93 Correct 494 ms 185860 KB Output is correct
94 Correct 814 ms 185992 KB Output is correct
95 Correct 278 ms 179140 KB Output is correct
96 Correct 423 ms 182740 KB Output is correct
97 Correct 317 ms 180520 KB Output is correct
98 Correct 455 ms 182784 KB Output is correct
99 Correct 148 ms 177876 KB Output is correct
100 Correct 530 ms 183892 KB Output is correct
101 Correct 601 ms 183508 KB Output is correct
102 Correct 461 ms 182344 KB Output is correct
103 Correct 478 ms 183136 KB Output is correct
104 Correct 389 ms 182320 KB Output is correct
105 Correct 515 ms 183136 KB Output is correct
106 Correct 435 ms 184572 KB Output is correct
107 Correct 594 ms 186952 KB Output is correct
108 Correct 303 ms 179956 KB Output is correct
109 Correct 310 ms 179980 KB Output is correct
110 Correct 371 ms 181012 KB Output is correct
111 Correct 367 ms 180972 KB Output is correct