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Submission #714306

# Submission time Handle Problem Language Result Execution time Memory
714306 2023-03-24T08:23:50 Z vjudge1 Event Hopping (BOI22_events) C++17
100 / 100
 401 ms 44328 KB 
#include<bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
const int N=200'010;
const int LG=20;
struct event {
  int s, e, idx;
};
event es[N];
struct Binary_Lifting {
  int up[N][LG];
  void add(int node, int par) {
    up[node][0]=par;
    for(int i = 1;i<LG;i++) {
      up[node][i]=up[up[node][i-1]][i-1];
    }
  }
  int get(int start, int num) {
    if(es[start].e>=num)return 1;
    int res=1;
    for(int i = LG-1;i>=0;i--) {
      if(es[up[start][i]].e<num) {
        start=up[start][i];
        res+=(1<<i);
      }
    }
    if(es[up[start][0]].e>=num)return res+1;
    return -1;
  }
};
bool operator<(const event &a, const event &b) {
  return a.e>b.e;
}
Binary_Lifting bl;
vector<int> child[N];
int out[N];
void dfs(int at) {
  for(int to:child[at]){ 
    bl.add(to,at);  
    dfs(to);
  }
}
pair<int,int> T[4*N];
void update(int at, pair<int,int> val, int tl=0, int tr=N-1, int v=1) {
  if(tl==tr) {
    T[v]=max(T[v], val);
    return;
  }
  int tm=(tl+tr)/2;
  if(at<=tm) {
    update(at, val, tl,tm,2*v);
  }
  else update(at, val, tm+1,tr,2*v+1);
  T[v]=max(T[2*v],T[2*v+1]);
}
pair<int,int> query(int l, int r, int tl=0, int tr=N-1, int v=1) {
  if(tr<l or r<tl)return {-1,-1};
  if(l<=tl and tr<=r)return T[v];
  int tm=(tl+tr)/2;
  return max(query(l,r,tl,tm,2*v), query(l,r,tm+1,tr,2*v+1));
}
int main () {
  cin.tie(0)->sync_with_stdio(0);
  int n, q;
  cin >> n >> q;
  map<int,int> cc;
  for(int i = 0;i<n;i++) {
    cin >> es[i].e >> es[i].s;
    es[i].s*=-1;
    es[i].e*=-1;
    cc[es[i].s]=1;
    cc[es[i].e]=1;
    es[i].idx=i;
  }
  vector<event> on[2*n], off[2*n];
  {
    int cnt=0;
    for(auto &i:cc) {
      i.second=cnt++;
    }
    for(int i = 0;i<n;i++) {
      es[i].s=cc[es[i].s];
      es[i].e=cc[es[i].e];
    }
  }
  for(int i = 0;i<n;i++) {
    update(es[i].s, {es[i].e, i});
  }
  for(int i = 0;i<n;i++) {
    pair<int,int> c=query(es[i].s, es[i].e);
    if(c.first>es[i].e){
      child[c.second].push_back(i);
      out[i]++;
    }
  }
  for(int i = 0;i<n;i++) {
    if(out[i]==0){
      bl.add(i,i);
      dfs(i);
    }
  }
  while(q--) {
   int s, e;
   cin >> s >> e;
   swap(s,e);
   if(es[s-1].s>es[e-1].s){
     cout << "impossible" << "\n";
     continue;
   }
   if(s==e) {
     cout << 0 << "\n";
     continue;
   }
   int res=bl.get(s-1,es[e-1].s);
   if(res>=0)cout << res << "\n";
   else cout << "impossible\n";
  }
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 258 ms 37000 KB Output is correct
3 Correct 265 ms 39844 KB Output is correct
4 Correct 298 ms 39828 KB Output is correct
5 Correct 271 ms 39960 KB Output is correct
6 Correct 264 ms 40212 KB Output is correct
7 Correct 231 ms 40160 KB Output is correct
8 Correct 262 ms 41152 KB Output is correct
9 Correct 221 ms 41036 KB Output is correct
10 Correct 262 ms 38948 KB Output is correct
11 Correct 252 ms 40120 KB Output is correct
12 Correct 125 ms 33708 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5076 KB Output is correct
3 Correct 4 ms 5332 KB Output is correct
4 Correct 5 ms 5332 KB Output is correct
5 Correct 3 ms 5332 KB Output is correct
6 Correct 4 ms 5332 KB Output is correct
7 Correct 4 ms 5332 KB Output is correct
8 Correct 4 ms 5332 KB Output is correct
9 Correct 3 ms 5204 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5076 KB Output is correct
3 Correct 4 ms 5332 KB Output is correct
4 Correct 5 ms 5332 KB Output is correct
5 Correct 3 ms 5332 KB Output is correct
6 Correct 4 ms 5332 KB Output is correct
7 Correct 4 ms 5332 KB Output is correct
8 Correct 4 ms 5332 KB Output is correct
9 Correct 3 ms 5204 KB Output is correct
10 Correct 3 ms 5076 KB Output is correct
11 Correct 3 ms 5076 KB Output is correct
12 Correct 4 ms 5332 KB Output is correct
13 Correct 4 ms 5380 KB Output is correct
14 Correct 4 ms 5332 KB Output is correct
15 Correct 4 ms 5332 KB Output is correct
16 Correct 4 ms 5332 KB Output is correct
17 Correct 4 ms 5332 KB Output is correct
18 Correct 4 ms 5204 KB Output is correct
19 Correct 36 ms 7056 KB Output is correct
20 Correct 36 ms 7116 KB Output is correct
21 Correct 37 ms 7372 KB Output is correct
22 Correct 31 ms 7196 KB Output is correct
23 Correct 36 ms 7444 KB Output is correct
24 Correct 33 ms 7324 KB Output is correct
25 Correct 36 ms 7116 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5076 KB Output is correct
3 Correct 4 ms 5332 KB Output is correct
4 Correct 5 ms 5332 KB Output is correct
5 Correct 3 ms 5332 KB Output is correct
6 Correct 4 ms 5332 KB Output is correct
7 Correct 4 ms 5332 KB Output is correct
8 Correct 4 ms 5332 KB Output is correct
9 Correct 3 ms 5204 KB Output is correct
10 Correct 3 ms 5076 KB Output is correct
11 Correct 3 ms 5076 KB Output is correct
12 Correct 4 ms 5332 KB Output is correct
13 Correct 4 ms 5332 KB Output is correct
14 Correct 5 ms 5332 KB Output is correct
15 Correct 4 ms 5332 KB Output is correct
16 Correct 4 ms 5332 KB Output is correct
17 Correct 4 ms 5332 KB Output is correct
18 Correct 4 ms 5204 KB Output is correct
19 Correct 194 ms 36044 KB Output is correct
20 Correct 184 ms 37296 KB Output is correct
21 Correct 185 ms 32136 KB Output is correct
22 Correct 240 ms 37900 KB Output is correct
23 Correct 232 ms 37660 KB Output is correct
24 Correct 289 ms 42376 KB Output is correct
25 Correct 54 ms 24652 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 274 ms 36788 KB Output is correct
2 Correct 239 ms 39848 KB Output is correct
3 Correct 294 ms 39852 KB Output is correct
4 Correct 227 ms 41092 KB Output is correct
5 Correct 266 ms 38952 KB Output is correct
6 Correct 317 ms 44328 KB Output is correct
7 Correct 380 ms 44280 KB Output is correct
8 Correct 293 ms 42876 KB Output is correct
9 Correct 281 ms 37704 KB Output is correct
10 Correct 318 ms 43832 KB Output is correct
11 Correct 314 ms 42564 KB Output is correct
12 Correct 304 ms 43880 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 258 ms 37000 KB Output is correct
3 Correct 265 ms 39844 KB Output is correct
4 Correct 298 ms 39828 KB Output is correct
5 Correct 271 ms 39960 KB Output is correct
6 Correct 264 ms 40212 KB Output is correct
7 Correct 231 ms 40160 KB Output is correct
8 Correct 262 ms 41152 KB Output is correct
9 Correct 221 ms 41036 KB Output is correct
10 Correct 262 ms 38948 KB Output is correct
11 Correct 252 ms 40120 KB Output is correct
12 Correct 125 ms 33708 KB Output is correct
13 Correct 3 ms 5076 KB Output is correct
14 Correct 3 ms 5076 KB Output is correct
15 Correct 4 ms 5332 KB Output is correct
16 Correct 5 ms 5332 KB Output is correct
17 Correct 3 ms 5332 KB Output is correct
18 Correct 4 ms 5332 KB Output is correct
19 Correct 4 ms 5332 KB Output is correct
20 Correct 4 ms 5332 KB Output is correct
21 Correct 3 ms 5204 KB Output is correct
22 Correct 3 ms 5076 KB Output is correct
23 Correct 3 ms 5076 KB Output is correct
24 Correct 4 ms 5332 KB Output is correct
25 Correct 4 ms 5380 KB Output is correct
26 Correct 4 ms 5332 KB Output is correct
27 Correct 4 ms 5332 KB Output is correct
28 Correct 4 ms 5332 KB Output is correct
29 Correct 4 ms 5332 KB Output is correct
30 Correct 4 ms 5204 KB Output is correct
31 Correct 36 ms 7056 KB Output is correct
32 Correct 36 ms 7116 KB Output is correct
33 Correct 37 ms 7372 KB Output is correct
34 Correct 31 ms 7196 KB Output is correct
35 Correct 36 ms 7444 KB Output is correct
36 Correct 33 ms 7324 KB Output is correct
37 Correct 36 ms 7116 KB Output is correct
38 Correct 3 ms 5076 KB Output is correct
39 Correct 3 ms 5076 KB Output is correct
40 Correct 4 ms 5332 KB Output is correct
41 Correct 4 ms 5332 KB Output is correct
42 Correct 5 ms 5332 KB Output is correct
43 Correct 4 ms 5332 KB Output is correct
44 Correct 4 ms 5332 KB Output is correct
45 Correct 4 ms 5332 KB Output is correct
46 Correct 4 ms 5204 KB Output is correct
47 Correct 194 ms 36044 KB Output is correct
48 Correct 184 ms 37296 KB Output is correct
49 Correct 185 ms 32136 KB Output is correct
50 Correct 240 ms 37900 KB Output is correct
51 Correct 232 ms 37660 KB Output is correct
52 Correct 289 ms 42376 KB Output is correct
53 Correct 54 ms 24652 KB Output is correct
54 Correct 274 ms 36788 KB Output is correct
55 Correct 239 ms 39848 KB Output is correct
56 Correct 294 ms 39852 KB Output is correct
57 Correct 227 ms 41092 KB Output is correct
58 Correct 266 ms 38952 KB Output is correct
59 Correct 317 ms 44328 KB Output is correct
60 Correct 380 ms 44280 KB Output is correct
61 Correct 293 ms 42876 KB Output is correct
62 Correct 281 ms 37704 KB Output is correct
63 Correct 318 ms 43832 KB Output is correct
64 Correct 314 ms 42564 KB Output is correct
65 Correct 304 ms 43880 KB Output is correct
66 Correct 3 ms 5076 KB Output is correct
67 Correct 227 ms 39896 KB Output is correct
68 Correct 213 ms 39756 KB Output is correct
69 Correct 244 ms 39732 KB Output is correct
70 Correct 242 ms 39980 KB Output is correct
71 Correct 242 ms 40228 KB Output is correct
72 Correct 261 ms 40172 KB Output is correct
73 Correct 229 ms 41120 KB Output is correct
74 Correct 227 ms 41156 KB Output is correct
75 Correct 254 ms 38952 KB Output is correct
76 Correct 270 ms 40248 KB Output is correct
77 Correct 128 ms 33740 KB Output is correct
78 Correct 3 ms 5076 KB Output is correct
79 Correct 5 ms 5332 KB Output is correct
80 Correct 5 ms 5332 KB Output is correct
81 Correct 4 ms 5292 KB Output is correct
82 Correct 6 ms 5332 KB Output is correct
83 Correct 5 ms 5332 KB Output is correct
84 Correct 5 ms 5304 KB Output is correct
85 Correct 3 ms 5204 KB Output is correct
86 Correct 36 ms 7984 KB Output is correct
87 Correct 34 ms 8124 KB Output is correct
88 Correct 40 ms 8404 KB Output is correct
89 Correct 44 ms 8220 KB Output is correct
90 Correct 33 ms 8348 KB Output is correct
91 Correct 30 ms 8320 KB Output is correct
92 Correct 32 ms 8136 KB Output is correct
93 Correct 209 ms 38048 KB Output is correct
94 Correct 193 ms 37368 KB Output is correct
95 Correct 188 ms 33008 KB Output is correct
96 Correct 227 ms 37832 KB Output is correct
97 Correct 229 ms 37764 KB Output is correct
98 Correct 272 ms 42316 KB Output is correct
99 Correct 55 ms 24628 KB Output is correct
100 Correct 401 ms 44264 KB Output is correct
101 Correct 311 ms 44284 KB Output is correct
102 Correct 367 ms 42836 KB Output is correct
103 Correct 317 ms 44028 KB Output is correct
104 Correct 374 ms 42528 KB Output is correct
105 Correct 319 ms 43904 KB Output is correct
106 Correct 219 ms 36352 KB Output is correct
107 Correct 291 ms 39184 KB Output is correct
108 Correct 218 ms 34960 KB Output is correct
109 Correct 205 ms 35020 KB Output is correct
110 Correct 363 ms 41636 KB Output is correct
111 Correct 324 ms 41472 KB Output is correct