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Submission #1099015

# Submission time Handle Problem Language Result Execution time Memory
1099015 2024-10-10T12:14:37 Z epicci23 Event Hopping (BOI22_events) C++17
100 / 100
 164 ms 37656 KB 
#include "bits/stdc++.h"
#define int long long
#define all(v) v.begin() , v.end()
#define sz(a) (int)a.size()
using namespace std;

const int N = 2e5 + 5;
const int LOG = 20;

vector<array<int,2>> v(N);
vector<int> zip;
int seg[4*N],lift[N][LOG];

int merge(int a,int b){
  if(!a || !b) return (!a ? b : a);
  if(v[a][0]<v[b][0]) return a;
  return b;
}

void upd(int rt,int l,int r,int ind,int u){
  if(r<ind || l>ind) return;
  if(l==r){
    seg[rt]=merge(seg[rt],u);
    return;
  }
  int m=(l+r)/2;
  upd(rt*2,l,m,ind,u),upd(rt*2+1,m+1,r,ind,u);
  seg[rt]=merge(seg[rt*2],seg[rt*2+1]);
}

int query(int rt,int l,int r,int gl,int gr){
  if(r<gl || l>gr) return 0;
  if(l>=gl && r<=gr) return seg[rt];
  int m=(l+r)/2;
  return merge(query(rt*2,l,m,gl,gr),query(rt*2+1,m+1,r,gl,gr));
}

void _(){
  int n,q;
  cin >> n >> q;
  
  for(int i=1;i<=n;i++){
  	int l,r;
  	cin >> l >> r;
  	v[i]={l,r};
  	zip.push_back(l);
  	zip.push_back(r);
  }
  sort(all(zip));
  zip.erase(unique(all(zip)),zip.end());

  for(int i=1;i<=n;i++){
  	v[i][0]=(lower_bound(all(zip),v[i][0])-zip.begin())+1;
  	v[i][1]=(lower_bound(all(zip),v[i][1])-zip.begin())+1;
  }

  vector<int> ans(q+5,-1);
  vector<int> lmao[N];
  for(int i=1;i<=n;i++) lmao[v[i][1]].push_back(i);
  
  for(int i=1;i<N;i++){
    for(int u:lmao[i]) upd(1,1,N,v[u][1],u);
    for(int u:lmao[i]){
     int xd = query(1,1,N,v[u][0],v[u][1]);
     if(xd && v[xd][0] < v[u][0]) lift[u][0]=xd;
    }
  }

  for(int j=1;j<LOG;j++){
    for(int i=1;i<=n;i++){
      lift[i][j]=lift[lift[i][j-1]][j-1];
    }
  }
 
  for(int j=1;j<=q;j++){
    int a,b,ind = j;
    cin >> a >> b;
    if(a==b){
      ans[ind]=0;
      continue;
    }
    if(v[a][1]>v[b][1]) continue;
    if(v[a][1]>=v[b][0]){
      ans[ind]=1;
      continue;
    }
    int res=0,p=b;
    for(int i=LOG-1;i>=0;i--){
      if(!lift[p][i]) continue;
      if(v[lift[p][i]][0]>v[a][1]){
        p=lift[p][i];
        res+=(1LL<<i);
      }
    }
    //cout << "ulan: " << ind << ' ' << p << '\n';
    if(lift[p][0] && v[p][0]>v[a][1]){
      res++;
      p=lift[p][0];
    }
    if(v[p][0]<=v[a][1]) ans[ind]=res+1;
  }

  for(int i=1;i<=q;i++){
    if(ans[i]==-1) cout << "impossible\n";
    else cout << ans[i] << '\n';
  }
}

int32_t main(){
  cin.tie(0); ios::sync_with_stdio(0);
  int tc=1;//cin >> tc;
  while(tc--) _();
  return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 8284 KB Output is correct
2 Correct 116 ms 35200 KB Output is correct
3 Correct 125 ms 35200 KB Output is correct
4 Correct 141 ms 35020 KB Output is correct
5 Correct 131 ms 35276 KB Output is correct
6 Correct 131 ms 35528 KB Output is correct
7 Correct 134 ms 35528 KB Output is correct
8 Correct 113 ms 37576 KB Output is correct
9 Correct 111 ms 37656 KB Output is correct
10 Correct 134 ms 35564 KB Output is correct
11 Correct 127 ms 36300 KB Output is correct
12 Correct 78 ms 33184 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 8108 KB Output is correct
2 Correct 4 ms 8244 KB Output is correct
3 Correct 5 ms 8540 KB Output is correct
4 Correct 5 ms 8540 KB Output is correct
5 Correct 5 ms 8540 KB Output is correct
6 Correct 5 ms 8540 KB Output is correct
7 Correct 6 ms 8608 KB Output is correct
8 Correct 5 ms 8540 KB Output is correct
9 Correct 6 ms 8540 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 8108 KB Output is correct
2 Correct 4 ms 8244 KB Output is correct
3 Correct 5 ms 8540 KB Output is correct
4 Correct 5 ms 8540 KB Output is correct
5 Correct 5 ms 8540 KB Output is correct
6 Correct 5 ms 8540 KB Output is correct
7 Correct 6 ms 8608 KB Output is correct
8 Correct 5 ms 8540 KB Output is correct
9 Correct 6 ms 8540 KB Output is correct
10 Correct 5 ms 8284 KB Output is correct
11 Correct 5 ms 8284 KB Output is correct
12 Correct 5 ms 8540 KB Output is correct
13 Correct 5 ms 8536 KB Output is correct
14 Correct 5 ms 8792 KB Output is correct
15 Correct 8 ms 8536 KB Output is correct
16 Correct 6 ms 8448 KB Output is correct
17 Correct 5 ms 8540 KB Output is correct
18 Correct 5 ms 8540 KB Output is correct
19 Correct 27 ms 11612 KB Output is correct
20 Correct 29 ms 11608 KB Output is correct
21 Correct 32 ms 11856 KB Output is correct
22 Correct 34 ms 11852 KB Output is correct
23 Correct 25 ms 12124 KB Output is correct
24 Correct 33 ms 11868 KB Output is correct
25 Correct 26 ms 11604 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 8108 KB Output is correct
2 Correct 4 ms 8244 KB Output is correct
3 Correct 5 ms 8540 KB Output is correct
4 Correct 5 ms 8540 KB Output is correct
5 Correct 5 ms 8540 KB Output is correct
6 Correct 5 ms 8540 KB Output is correct
7 Correct 6 ms 8608 KB Output is correct
8 Correct 5 ms 8540 KB Output is correct
9 Correct 6 ms 8540 KB Output is correct
10 Correct 5 ms 8280 KB Output is correct
11 Correct 5 ms 8284 KB Output is correct
12 Correct 5 ms 8572 KB Output is correct
13 Correct 6 ms 8540 KB Output is correct
14 Correct 9 ms 8364 KB Output is correct
15 Correct 7 ms 8488 KB Output is correct
16 Correct 6 ms 8536 KB Output is correct
17 Correct 6 ms 8572 KB Output is correct
18 Correct 5 ms 8312 KB Output is correct
19 Correct 107 ms 32552 KB Output is correct
20 Correct 101 ms 31632 KB Output is correct
21 Correct 114 ms 31032 KB Output is correct
22 Correct 106 ms 33232 KB Output is correct
23 Correct 119 ms 32676 KB Output is correct
24 Correct 141 ms 34508 KB Output is correct
25 Correct 52 ms 28608 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 128 ms 35156 KB Output is correct
2 Correct 149 ms 35036 KB Output is correct
3 Correct 147 ms 35192 KB Output is correct
4 Correct 114 ms 37576 KB Output is correct
5 Correct 132 ms 35352 KB Output is correct
6 Correct 140 ms 37324 KB Output is correct
7 Correct 138 ms 37236 KB Output is correct
8 Correct 147 ms 37328 KB Output is correct
9 Correct 108 ms 32672 KB Output is correct
10 Correct 135 ms 37008 KB Output is correct
11 Correct 136 ms 36168 KB Output is correct
12 Correct 139 ms 36808 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 8284 KB Output is correct
2 Correct 116 ms 35200 KB Output is correct
3 Correct 125 ms 35200 KB Output is correct
4 Correct 141 ms 35020 KB Output is correct
5 Correct 131 ms 35276 KB Output is correct
6 Correct 131 ms 35528 KB Output is correct
7 Correct 134 ms 35528 KB Output is correct
8 Correct 113 ms 37576 KB Output is correct
9 Correct 111 ms 37656 KB Output is correct
10 Correct 134 ms 35564 KB Output is correct
11 Correct 127 ms 36300 KB Output is correct
12 Correct 78 ms 33184 KB Output is correct
13 Correct 5 ms 8108 KB Output is correct
14 Correct 4 ms 8244 KB Output is correct
15 Correct 5 ms 8540 KB Output is correct
16 Correct 5 ms 8540 KB Output is correct
17 Correct 5 ms 8540 KB Output is correct
18 Correct 5 ms 8540 KB Output is correct
19 Correct 6 ms 8608 KB Output is correct
20 Correct 5 ms 8540 KB Output is correct
21 Correct 6 ms 8540 KB Output is correct
22 Correct 5 ms 8284 KB Output is correct
23 Correct 5 ms 8284 KB Output is correct
24 Correct 5 ms 8540 KB Output is correct
25 Correct 5 ms 8536 KB Output is correct
26 Correct 5 ms 8792 KB Output is correct
27 Correct 8 ms 8536 KB Output is correct
28 Correct 6 ms 8448 KB Output is correct
29 Correct 5 ms 8540 KB Output is correct
30 Correct 5 ms 8540 KB Output is correct
31 Correct 27 ms 11612 KB Output is correct
32 Correct 29 ms 11608 KB Output is correct
33 Correct 32 ms 11856 KB Output is correct
34 Correct 34 ms 11852 KB Output is correct
35 Correct 25 ms 12124 KB Output is correct
36 Correct 33 ms 11868 KB Output is correct
37 Correct 26 ms 11604 KB Output is correct
38 Correct 5 ms 8280 KB Output is correct
39 Correct 5 ms 8284 KB Output is correct
40 Correct 5 ms 8572 KB Output is correct
41 Correct 6 ms 8540 KB Output is correct
42 Correct 9 ms 8364 KB Output is correct
43 Correct 7 ms 8488 KB Output is correct
44 Correct 6 ms 8536 KB Output is correct
45 Correct 6 ms 8572 KB Output is correct
46 Correct 5 ms 8312 KB Output is correct
47 Correct 107 ms 32552 KB Output is correct
48 Correct 101 ms 31632 KB Output is correct
49 Correct 114 ms 31032 KB Output is correct
50 Correct 106 ms 33232 KB Output is correct
51 Correct 119 ms 32676 KB Output is correct
52 Correct 141 ms 34508 KB Output is correct
53 Correct 52 ms 28608 KB Output is correct
54 Correct 128 ms 35156 KB Output is correct
55 Correct 149 ms 35036 KB Output is correct
56 Correct 147 ms 35192 KB Output is correct
57 Correct 114 ms 37576 KB Output is correct
58 Correct 132 ms 35352 KB Output is correct
59 Correct 140 ms 37324 KB Output is correct
60 Correct 138 ms 37236 KB Output is correct
61 Correct 147 ms 37328 KB Output is correct
62 Correct 108 ms 32672 KB Output is correct
63 Correct 135 ms 37008 KB Output is correct
64 Correct 136 ms 36168 KB Output is correct
65 Correct 139 ms 36808 KB Output is correct
66 Correct 4 ms 8280 KB Output is correct
67 Correct 115 ms 35016 KB Output is correct
68 Correct 136 ms 35016 KB Output is correct
69 Correct 147 ms 35016 KB Output is correct
70 Correct 151 ms 35440 KB Output is correct
71 Correct 133 ms 35640 KB Output is correct
72 Correct 139 ms 35692 KB Output is correct
73 Correct 123 ms 37576 KB Output is correct
74 Correct 109 ms 37576 KB Output is correct
75 Correct 135 ms 35448 KB Output is correct
76 Correct 143 ms 36212 KB Output is correct
77 Correct 81 ms 33224 KB Output is correct
78 Correct 4 ms 8280 KB Output is correct
79 Correct 5 ms 8536 KB Output is correct
80 Correct 5 ms 8364 KB Output is correct
81 Correct 6 ms 8536 KB Output is correct
82 Correct 5 ms 8508 KB Output is correct
83 Correct 5 ms 8536 KB Output is correct
84 Correct 7 ms 8540 KB Output is correct
85 Correct 5 ms 8536 KB Output is correct
86 Correct 28 ms 11644 KB Output is correct
87 Correct 26 ms 11612 KB Output is correct
88 Correct 32 ms 11860 KB Output is correct
89 Correct 25 ms 11860 KB Output is correct
90 Correct 29 ms 11856 KB Output is correct
91 Correct 22 ms 11856 KB Output is correct
92 Correct 23 ms 11612 KB Output is correct
93 Correct 98 ms 32460 KB Output is correct
94 Correct 95 ms 31688 KB Output is correct
95 Correct 99 ms 31176 KB Output is correct
96 Correct 96 ms 33228 KB Output is correct
97 Correct 106 ms 32456 KB Output is correct
98 Correct 111 ms 34532 KB Output is correct
99 Correct 53 ms 28616 KB Output is correct
100 Correct 144 ms 37244 KB Output is correct
101 Correct 159 ms 37332 KB Output is correct
102 Correct 142 ms 37320 KB Output is correct
103 Correct 137 ms 36968 KB Output is correct
104 Correct 133 ms 36232 KB Output is correct
105 Correct 146 ms 36804 KB Output is correct
106 Correct 128 ms 33476 KB Output is correct
107 Correct 134 ms 34504 KB Output is correct
108 Correct 127 ms 33992 KB Output is correct
109 Correct 127 ms 33876 KB Output is correct
110 Correct 164 ms 37064 KB Output is correct
111 Correct 155 ms 37060 KB Output is correct