oj.uz

Submission #604097

# Submission time Handle Problem Language Result Execution time Memory
604097 2022-07-24T17:55:17 Z Evirir Event Hopping (BOI22_events) C++17
100 / 100
 199 ms 23688 KB 
#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
//using namespace __gnu_pbds;

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2")
#define watch(x) cout<<(#x)<<"="<<(x)<<'\n'
#define mset(d,val) memset(d,val,sizeof(d))
#define cbug if(DEBUG) cout
#define setp(x) cout<<fixed<<setprecision(x)
#define sz(x) (int)(x).size()
#define all(x) begin(x), end(x)
#define forn(i,a,b) for(int i=(a);i<(b);i++)
#define fore(i,a,b) for(int i=(a);i<=(b);i++)
#define pb push_back
#define F first
#define S second
#define fbo find_by_order
#define ook order_of_key
typedef long long ll;
typedef long double ld;
typedef pair<int,int> ii;
typedef vector<int> vi;
typedef vector<ii> vii;
//template<typename T>
//using pbds = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
void SD(int t=0){ cout<<"PASSED "<<t<<endl; }
ostream& operator<<(ostream &out, ii x){ out<<"("<<x.F<<","<<x.S<<")"; return out; }
template<typename T> void amax(T &a, T b){ a=max(a,b); }
template<typename T> void amin(T &a, T b){ a=min(a,b); }
const ll INF = ll(1e18);
const int MOD = 998244353;

class PointSegmentTree{
private:
	int size_;
	vector<ii> v;
	void update(int p, ii val, int k, int l, int r)
	{
		if(p < l || r < p) return;
		if(l == r){
			v[k]=val;	//modification
			return;
		}
		int mid = (l+r)>>1;
		update(p, val, k*2, l, mid);
		update(p, val, k*2+1, mid+1, r);
		v[k] = merge(v[k*2], v[k*2+1]);
	}
	ii query(int s, int e, int k, int l, int r)
	{
		if(e < l || r < s) return {-1,-1}; //dummy value
		if(s <= l && r <= e) return v[k];
		int mid = (l+r)>>1;
		ii lc = query(s, e, k*2, l, mid);
		ii rc = query(s, e, k*2+1, mid+1, r);
		return merge(lc, rc);
	}
	
public:
	PointSegmentTree(): v(vector<ii>()) {}
	PointSegmentTree(int n){
		for(size_=1;size_<n;) size_<<=1;
		v.resize(size_*4,{-1,-1});
	}
	//void reset(){}
	inline ii merge(ii x, ii y){
		return max(x,y);
	}
	inline void update(int p, ii val){
		update(p, val, 1, 0, size_-1);
	}
	inline ii query(int l, int r){
		return query(l, r, 1, 0, size_-1);
	}
};

const bool DEBUG = 0;
const int MAXN = 100005;
const int MAXA = MAXN * 2;
const int LG = 20;

int n,Q;
int s[MAXN], e[MAXN];  //reversed
ii mx[MAXA];
int nxt[MAXN][LG];
PointSegmentTree st;

vi comp;
int getid(int x){ return sz(comp) - 1 - (lower_bound(all(comp), x) - comp.begin()); }

int main()
{
	ios_base::sync_with_stdio(0); cin.tie(0);
	mset(nxt,-1);

	cin>>n>>Q;
	forn(i,0,n)
	{
		cin>>e[i]>>s[i];
		comp.pb(s[i]);
		comp.pb(e[i]);
	}

	// compress everything in reverse
	sort(all(comp));
	forn(i,0,n)
	{
		s[i]=getid(s[i]);
		e[i]=getid(e[i]);
	}
	
	// compute first next
	forn(i,0,MAXA) mx[i]={-1,-1};
	forn(i,0,n) amax(mx[s[i]], {e[i], i});

	st=PointSegmentTree(MAXA);
	forn(i,0,MAXA) st.update(i, mx[i]);
	forn(i,0,n)
	{
		nxt[i][0] = st.query(s[i], e[i]).S;
	}

	// binary lifting
	forn(j,1,LG) forn(i,0,n) if(nxt[i][j-1]!=-1) nxt[i][j] = nxt[nxt[i][j-1]][j-1];

	forn(z,0,Q)
	{
		int u,v; cin>>v>>u; u--; v--;
		if(u==v)
		{
			cout<<0<<'\n';
			continue;
		}
		if(s[v]<s[u])
		{
			cout<<"impossible\n";
			continue;
		}
		if(s[u]<=s[v] && s[v]<=e[u])
		{
			cout<<1<<'\n';
			continue;
		}

		int ans=2;
		for(int j=LG-1;j>=0;j--)
		{
			// cout<<"u="<<u<<" j="<<j<<" nxt="<<nxt[u][j]<<'\n';
			if(nxt[u][j]!=-1 && e[nxt[u][j]]<s[v])
			{
				u=nxt[u][j];
				ans+=(1<<j);
				// cout<<"ans="<<ans<<'\n';
			}
		}
		u=nxt[u][0];
		assert(u!=-1);
		
		if(e[u]>=s[v]) cout<<ans<<'\n';
		else cout<<"impossible\n";
	}
	
	return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 36 ms 17912 KB Output is correct
2 Correct 145 ms 20216 KB Output is correct
3 Correct 188 ms 20224 KB Output is correct
4 Correct 168 ms 20084 KB Output is correct
5 Correct 151 ms 20180 KB Output is correct
6 Correct 177 ms 20260 KB Output is correct
7 Correct 163 ms 20220 KB Output is correct
8 Correct 135 ms 20604 KB Output is correct
9 Correct 135 ms 21064 KB Output is correct
10 Correct 154 ms 20952 KB Output is correct
11 Correct 154 ms 20992 KB Output is correct
12 Correct 105 ms 21128 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 37 ms 17876 KB Output is correct
2 Correct 40 ms 17876 KB Output is correct
3 Correct 41 ms 17876 KB Output is correct
4 Correct 38 ms 17876 KB Output is correct
5 Correct 36 ms 17876 KB Output is correct
6 Correct 37 ms 17876 KB Output is correct
7 Correct 36 ms 17876 KB Output is correct
8 Correct 37 ms 17876 KB Output is correct
9 Correct 38 ms 17876 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 37 ms 17876 KB Output is correct
2 Correct 40 ms 17876 KB Output is correct
3 Correct 41 ms 17876 KB Output is correct
4 Correct 38 ms 17876 KB Output is correct
5 Correct 36 ms 17876 KB Output is correct
6 Correct 37 ms 17876 KB Output is correct
7 Correct 36 ms 17876 KB Output is correct
8 Correct 37 ms 17876 KB Output is correct
9 Correct 38 ms 17876 KB Output is correct
10 Correct 35 ms 17904 KB Output is correct
11 Correct 40 ms 17836 KB Output is correct
12 Correct 39 ms 17932 KB Output is correct
13 Correct 40 ms 18004 KB Output is correct
14 Correct 36 ms 17972 KB Output is correct
15 Correct 36 ms 17912 KB Output is correct
16 Correct 36 ms 17876 KB Output is correct
17 Correct 43 ms 17876 KB Output is correct
18 Correct 44 ms 18004 KB Output is correct
19 Correct 68 ms 19516 KB Output is correct
20 Correct 66 ms 19608 KB Output is correct
21 Correct 65 ms 19780 KB Output is correct
22 Correct 63 ms 19860 KB Output is correct
23 Correct 60 ms 19620 KB Output is correct
24 Correct 60 ms 19744 KB Output is correct
25 Correct 64 ms 19352 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 37 ms 17876 KB Output is correct
2 Correct 40 ms 17876 KB Output is correct
3 Correct 41 ms 17876 KB Output is correct
4 Correct 38 ms 17876 KB Output is correct
5 Correct 36 ms 17876 KB Output is correct
6 Correct 37 ms 17876 KB Output is correct
7 Correct 36 ms 17876 KB Output is correct
8 Correct 37 ms 17876 KB Output is correct
9 Correct 38 ms 17876 KB Output is correct
10 Correct 36 ms 17876 KB Output is correct
11 Correct 36 ms 17876 KB Output is correct
12 Correct 37 ms 17916 KB Output is correct
13 Correct 37 ms 17980 KB Output is correct
14 Correct 38 ms 17956 KB Output is correct
15 Correct 39 ms 17876 KB Output is correct
16 Correct 37 ms 17904 KB Output is correct
17 Correct 37 ms 17924 KB Output is correct
18 Correct 38 ms 17856 KB Output is correct
19 Correct 118 ms 19912 KB Output is correct
20 Correct 122 ms 20000 KB Output is correct
21 Correct 123 ms 21272 KB Output is correct
22 Correct 118 ms 21464 KB Output is correct
23 Correct 129 ms 21444 KB Output is correct
24 Correct 124 ms 21448 KB Output is correct
25 Correct 80 ms 20832 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 154 ms 20124 KB Output is correct
2 Correct 145 ms 20128 KB Output is correct
3 Correct 199 ms 20132 KB Output is correct
4 Correct 137 ms 20728 KB Output is correct
5 Correct 160 ms 20472 KB Output is correct
6 Correct 172 ms 20336 KB Output is correct
7 Correct 169 ms 20320 KB Output is correct
8 Correct 159 ms 20380 KB Output is correct
9 Correct 124 ms 19616 KB Output is correct
10 Correct 152 ms 19964 KB Output is correct
11 Correct 169 ms 19748 KB Output is correct
12 Correct 161 ms 19956 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 36 ms 17912 KB Output is correct
2 Correct 145 ms 20216 KB Output is correct
3 Correct 188 ms 20224 KB Output is correct
4 Correct 168 ms 20084 KB Output is correct
5 Correct 151 ms 20180 KB Output is correct
6 Correct 177 ms 20260 KB Output is correct
7 Correct 163 ms 20220 KB Output is correct
8 Correct 135 ms 20604 KB Output is correct
9 Correct 135 ms 21064 KB Output is correct
10 Correct 154 ms 20952 KB Output is correct
11 Correct 154 ms 20992 KB Output is correct
12 Correct 105 ms 21128 KB Output is correct
13 Correct 37 ms 17876 KB Output is correct
14 Correct 40 ms 17876 KB Output is correct
15 Correct 41 ms 17876 KB Output is correct
16 Correct 38 ms 17876 KB Output is correct
17 Correct 36 ms 17876 KB Output is correct
18 Correct 37 ms 17876 KB Output is correct
19 Correct 36 ms 17876 KB Output is correct
20 Correct 37 ms 17876 KB Output is correct
21 Correct 38 ms 17876 KB Output is correct
22 Correct 35 ms 17904 KB Output is correct
23 Correct 40 ms 17836 KB Output is correct
24 Correct 39 ms 17932 KB Output is correct
25 Correct 40 ms 18004 KB Output is correct
26 Correct 36 ms 17972 KB Output is correct
27 Correct 36 ms 17912 KB Output is correct
28 Correct 36 ms 17876 KB Output is correct
29 Correct 43 ms 17876 KB Output is correct
30 Correct 44 ms 18004 KB Output is correct
31 Correct 68 ms 19516 KB Output is correct
32 Correct 66 ms 19608 KB Output is correct
33 Correct 65 ms 19780 KB Output is correct
34 Correct 63 ms 19860 KB Output is correct
35 Correct 60 ms 19620 KB Output is correct
36 Correct 60 ms 19744 KB Output is correct
37 Correct 64 ms 19352 KB Output is correct
38 Correct 36 ms 17876 KB Output is correct
39 Correct 36 ms 17876 KB Output is correct
40 Correct 37 ms 17916 KB Output is correct
41 Correct 37 ms 17980 KB Output is correct
42 Correct 38 ms 17956 KB Output is correct
43 Correct 39 ms 17876 KB Output is correct
44 Correct 37 ms 17904 KB Output is correct
45 Correct 37 ms 17924 KB Output is correct
46 Correct 38 ms 17856 KB Output is correct
47 Correct 118 ms 19912 KB Output is correct
48 Correct 122 ms 20000 KB Output is correct
49 Correct 123 ms 21272 KB Output is correct
50 Correct 118 ms 21464 KB Output is correct
51 Correct 129 ms 21444 KB Output is correct
52 Correct 124 ms 21448 KB Output is correct
53 Correct 80 ms 20832 KB Output is correct
54 Correct 154 ms 20124 KB Output is correct
55 Correct 145 ms 20128 KB Output is correct
56 Correct 199 ms 20132 KB Output is correct
57 Correct 137 ms 20728 KB Output is correct
58 Correct 160 ms 20472 KB Output is correct
59 Correct 172 ms 20336 KB Output is correct
60 Correct 169 ms 20320 KB Output is correct
61 Correct 159 ms 20380 KB Output is correct
62 Correct 124 ms 19616 KB Output is correct
63 Correct 152 ms 19964 KB Output is correct
64 Correct 169 ms 19748 KB Output is correct
65 Correct 161 ms 19956 KB Output is correct
66 Correct 37 ms 17908 KB Output is correct
67 Correct 145 ms 23220 KB Output is correct
68 Correct 160 ms 23252 KB Output is correct
69 Correct 179 ms 23172 KB Output is correct
70 Correct 155 ms 23348 KB Output is correct
71 Correct 168 ms 23348 KB Output is correct
72 Correct 156 ms 23396 KB Output is correct
73 Correct 135 ms 23620 KB Output is correct
74 Correct 134 ms 23672 KB Output is correct
75 Correct 179 ms 23688 KB Output is correct
76 Correct 148 ms 23620 KB Output is correct
77 Correct 110 ms 22980 KB Output is correct
78 Correct 44 ms 17812 KB Output is correct
79 Correct 38 ms 17876 KB Output is correct
80 Correct 36 ms 17876 KB Output is correct
81 Correct 36 ms 17972 KB Output is correct
82 Correct 37 ms 17876 KB Output is correct
83 Correct 38 ms 17916 KB Output is correct
84 Correct 36 ms 17916 KB Output is correct
85 Correct 39 ms 17876 KB Output is correct
86 Correct 65 ms 19532 KB Output is correct
87 Correct 80 ms 19596 KB Output is correct
88 Correct 70 ms 19788 KB Output is correct
89 Correct 60 ms 19844 KB Output is correct
90 Correct 62 ms 19700 KB Output is correct
91 Correct 72 ms 19668 KB Output is correct
92 Correct 67 ms 19312 KB Output is correct
93 Correct 113 ms 21496 KB Output is correct
94 Correct 108 ms 20648 KB Output is correct
95 Correct 130 ms 21468 KB Output is correct
96 Correct 132 ms 21516 KB Output is correct
97 Correct 142 ms 21576 KB Output is correct
98 Correct 123 ms 21512 KB Output is correct
99 Correct 81 ms 20808 KB Output is correct
100 Correct 176 ms 23368 KB Output is correct
101 Correct 176 ms 23360 KB Output is correct
102 Correct 173 ms 23480 KB Output is correct
103 Correct 153 ms 22984 KB Output is correct
104 Correct 152 ms 22604 KB Output is correct
105 Correct 154 ms 23040 KB Output is correct
106 Correct 196 ms 22628 KB Output is correct
107 Correct 163 ms 22804 KB Output is correct
108 Correct 151 ms 23316 KB Output is correct
109 Correct 161 ms 23272 KB Output is correct
110 Correct 156 ms 23416 KB Output is correct
111 Correct 185 ms 23240 KB Output is correct