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Submission #579663

# Submission time Handle Problem Language Result Execution time Memory
579663 2022-06-19T15:24:21 Z wdjpng Event Hopping (BOI22_events) C++17
100 / 100
 275 ms 40964 KB 
#include <bits/stdc++.h>
    
#define int long long
#define rep(i,n) for(int i = 0; i < n; i++)
#define per(i,n) for(int i = n-1; i >=0; i--)
#define all(a) a.begin(), a.end()
#define pii pair<int,int>
    
using namespace std;
    
vector<pii>T(1e6,{1e15,-1});
pii update(int i, int l, int r, int ui, pii uv)
{
    if(r<=ui||l>ui) return T[i];
    if(l+1==r) return T[i]=min(T[i],uv);
    
    return T[i] = min(update(2*i,l,(l+r)/2,ui,uv),update(2*i+1,(l+r)/2,r,ui,uv));
}
    
pii query(int i, int l, int r, int ql, int qr)
{
    if(qr<=l||r<=ql) return {1e15,-1};
    if(l>=ql&&r<=qr) return T[i];
    return min(query(2*i,l,(l+r)/2,ql,qr),query(2*i+1,(l+r)/2,r,ql,qr));
}
    
struct ev {int s,e;};
bool path(ev a, ev b)
{
    return b.s<=a.e&&b.e>=a.e;
}
    
signed main()
{
    cin.tie(0);
    ios_base::sync_with_stdio(false);
    
    int n,q;
    cin>>n>>q;
    vector<ev>evs(n);
    for(auto& e: evs) cin>>e.s>>e.e;
    vector<int>cords;
    for(ev e : evs) {cords.push_back(e.s); cords.push_back(e.e);}
    sort(all(cords));
    cords.erase(unique(all(cords)), cords.end());
    for(ev& e : evs) 
    {
        e.s=lower_bound(all(cords),e.s)-cords.begin();
        e.e=lower_bound(all(cords),e.e)-cords.begin();
    }
    
    rep(i,n) update(1,0,cords.size(), evs[i].e, {evs[i].s,i});
    
    vector<vector<int>>up(n, vector<int>(20));
    rep(i,n)
    {
        up[i][0]=query(1,0,cords.size(),evs[i].s,evs[i].e+1).second;
        if(up[i][0]==-1) up[i][0]=i;
    }
    
    for(int j = 1; j < 20; j++) rep(i,n) up[i][j]=up[up[i][j-1]][j-1];
    
    rep(cq,q)
    {
        int s,e;
        cin>>s>>e;
        s--; e--;
    
        int sum = 0;
        int v = e;
        for(int j = 19; j>=0;j--) if(evs[up[v][j]].s>evs[s].e) {v=up[v][j]; sum+=1<<j;}
        if(evs[v].s>evs[s].e) {sum++; v=up[v][0];}
        if(!path(evs[s], evs[v])) cout<<"impossible\n";
        else {
            if(s!=v) sum++;
            cout<<sum<<'\n';
        }
    }
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 15956 KB Output is correct
2 Correct 175 ms 39172 KB Output is correct
3 Correct 196 ms 39300 KB Output is correct
4 Correct 252 ms 39272 KB Output is correct
5 Correct 213 ms 39332 KB Output is correct
6 Correct 206 ms 39304 KB Output is correct
7 Correct 227 ms 39340 KB Output is correct
8 Correct 192 ms 39688 KB Output is correct
9 Correct 181 ms 39704 KB Output is correct
10 Correct 226 ms 39544 KB Output is correct
11 Correct 230 ms 39592 KB Output is correct
12 Correct 124 ms 39684 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 15936 KB Output is correct
2 Correct 7 ms 15956 KB Output is correct
3 Correct 8 ms 16212 KB Output is correct
4 Correct 8 ms 16204 KB Output is correct
5 Correct 8 ms 16212 KB Output is correct
6 Correct 8 ms 16112 KB Output is correct
7 Correct 8 ms 16084 KB Output is correct
8 Correct 9 ms 16232 KB Output is correct
9 Correct 8 ms 16212 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 15936 KB Output is correct
2 Correct 7 ms 15956 KB Output is correct
3 Correct 8 ms 16212 KB Output is correct
4 Correct 8 ms 16204 KB Output is correct
5 Correct 8 ms 16212 KB Output is correct
6 Correct 8 ms 16112 KB Output is correct
7 Correct 8 ms 16084 KB Output is correct
8 Correct 9 ms 16232 KB Output is correct
9 Correct 8 ms 16212 KB Output is correct
10 Correct 7 ms 15864 KB Output is correct
11 Correct 8 ms 15956 KB Output is correct
12 Correct 8 ms 16212 KB Output is correct
13 Correct 9 ms 16212 KB Output is correct
14 Correct 8 ms 16212 KB Output is correct
15 Correct 8 ms 16084 KB Output is correct
16 Correct 8 ms 16212 KB Output is correct
17 Correct 8 ms 16212 KB Output is correct
18 Correct 8 ms 16212 KB Output is correct
19 Correct 42 ms 17544 KB Output is correct
20 Correct 39 ms 17520 KB Output is correct
21 Correct 43 ms 17864 KB Output is correct
22 Correct 38 ms 17908 KB Output is correct
23 Correct 37 ms 17736 KB Output is correct
24 Correct 36 ms 17748 KB Output is correct
25 Correct 37 ms 17364 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 15936 KB Output is correct
2 Correct 7 ms 15956 KB Output is correct
3 Correct 8 ms 16212 KB Output is correct
4 Correct 8 ms 16204 KB Output is correct
5 Correct 8 ms 16212 KB Output is correct
6 Correct 8 ms 16112 KB Output is correct
7 Correct 8 ms 16084 KB Output is correct
8 Correct 9 ms 16232 KB Output is correct
9 Correct 8 ms 16212 KB Output is correct
10 Correct 7 ms 15956 KB Output is correct
11 Correct 8 ms 15976 KB Output is correct
12 Correct 8 ms 16212 KB Output is correct
13 Correct 8 ms 16212 KB Output is correct
14 Correct 8 ms 16212 KB Output is correct
15 Correct 8 ms 16212 KB Output is correct
16 Correct 9 ms 16212 KB Output is correct
17 Correct 8 ms 16096 KB Output is correct
18 Correct 7 ms 16212 KB Output is correct
19 Correct 150 ms 38584 KB Output is correct
20 Correct 155 ms 38576 KB Output is correct
21 Correct 156 ms 38608 KB Output is correct
22 Correct 169 ms 38568 KB Output is correct
23 Correct 174 ms 38852 KB Output is correct
24 Correct 190 ms 38652 KB Output is correct
25 Correct 64 ms 38724 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 192 ms 39208 KB Output is correct
2 Correct 202 ms 39208 KB Output is correct
3 Correct 255 ms 39236 KB Output is correct
4 Correct 178 ms 39724 KB Output is correct
5 Correct 234 ms 39648 KB Output is correct
6 Correct 251 ms 39336 KB Output is correct
7 Correct 254 ms 39364 KB Output is correct
8 Correct 215 ms 39540 KB Output is correct
9 Correct 170 ms 38596 KB Output is correct
10 Correct 230 ms 39200 KB Output is correct
11 Correct 206 ms 38840 KB Output is correct
12 Correct 235 ms 39064 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 15956 KB Output is correct
2 Correct 175 ms 39172 KB Output is correct
3 Correct 196 ms 39300 KB Output is correct
4 Correct 252 ms 39272 KB Output is correct
5 Correct 213 ms 39332 KB Output is correct
6 Correct 206 ms 39304 KB Output is correct
7 Correct 227 ms 39340 KB Output is correct
8 Correct 192 ms 39688 KB Output is correct
9 Correct 181 ms 39704 KB Output is correct
10 Correct 226 ms 39544 KB Output is correct
11 Correct 230 ms 39592 KB Output is correct
12 Correct 124 ms 39684 KB Output is correct
13 Correct 9 ms 15936 KB Output is correct
14 Correct 7 ms 15956 KB Output is correct
15 Correct 8 ms 16212 KB Output is correct
16 Correct 8 ms 16204 KB Output is correct
17 Correct 8 ms 16212 KB Output is correct
18 Correct 8 ms 16112 KB Output is correct
19 Correct 8 ms 16084 KB Output is correct
20 Correct 9 ms 16232 KB Output is correct
21 Correct 8 ms 16212 KB Output is correct
22 Correct 7 ms 15864 KB Output is correct
23 Correct 8 ms 15956 KB Output is correct
24 Correct 8 ms 16212 KB Output is correct
25 Correct 9 ms 16212 KB Output is correct
26 Correct 8 ms 16212 KB Output is correct
27 Correct 8 ms 16084 KB Output is correct
28 Correct 8 ms 16212 KB Output is correct
29 Correct 8 ms 16212 KB Output is correct
30 Correct 8 ms 16212 KB Output is correct
31 Correct 42 ms 17544 KB Output is correct
32 Correct 39 ms 17520 KB Output is correct
33 Correct 43 ms 17864 KB Output is correct
34 Correct 38 ms 17908 KB Output is correct
35 Correct 37 ms 17736 KB Output is correct
36 Correct 36 ms 17748 KB Output is correct
37 Correct 37 ms 17364 KB Output is correct
38 Correct 7 ms 15956 KB Output is correct
39 Correct 8 ms 15976 KB Output is correct
40 Correct 8 ms 16212 KB Output is correct
41 Correct 8 ms 16212 KB Output is correct
42 Correct 8 ms 16212 KB Output is correct
43 Correct 8 ms 16212 KB Output is correct
44 Correct 9 ms 16212 KB Output is correct
45 Correct 8 ms 16096 KB Output is correct
46 Correct 7 ms 16212 KB Output is correct
47 Correct 150 ms 38584 KB Output is correct
48 Correct 155 ms 38576 KB Output is correct
49 Correct 156 ms 38608 KB Output is correct
50 Correct 169 ms 38568 KB Output is correct
51 Correct 174 ms 38852 KB Output is correct
52 Correct 190 ms 38652 KB Output is correct
53 Correct 64 ms 38724 KB Output is correct
54 Correct 192 ms 39208 KB Output is correct
55 Correct 202 ms 39208 KB Output is correct
56 Correct 255 ms 39236 KB Output is correct
57 Correct 178 ms 39724 KB Output is correct
58 Correct 234 ms 39648 KB Output is correct
59 Correct 251 ms 39336 KB Output is correct
60 Correct 254 ms 39364 KB Output is correct
61 Correct 215 ms 39540 KB Output is correct
62 Correct 170 ms 38596 KB Output is correct
63 Correct 230 ms 39200 KB Output is correct
64 Correct 206 ms 38840 KB Output is correct
65 Correct 235 ms 39064 KB Output is correct
66 Correct 7 ms 15956 KB Output is correct
67 Correct 195 ms 39188 KB Output is correct
68 Correct 205 ms 39324 KB Output is correct
69 Correct 264 ms 39208 KB Output is correct
70 Correct 226 ms 39432 KB Output is correct
71 Correct 242 ms 39236 KB Output is correct
72 Correct 223 ms 39344 KB Output is correct
73 Correct 178 ms 39748 KB Output is correct
74 Correct 180 ms 39864 KB Output is correct
75 Correct 229 ms 39912 KB Output is correct
76 Correct 222 ms 39808 KB Output is correct
77 Correct 145 ms 39716 KB Output is correct
78 Correct 7 ms 15956 KB Output is correct
79 Correct 8 ms 16144 KB Output is correct
80 Correct 8 ms 16212 KB Output is correct
81 Correct 9 ms 16092 KB Output is correct
82 Correct 8 ms 16140 KB Output is correct
83 Correct 11 ms 16212 KB Output is correct
84 Correct 9 ms 16100 KB Output is correct
85 Correct 8 ms 16212 KB Output is correct
86 Correct 42 ms 17540 KB Output is correct
87 Correct 43 ms 17600 KB Output is correct
88 Correct 47 ms 17876 KB Output is correct
89 Correct 40 ms 17884 KB Output is correct
90 Correct 46 ms 17716 KB Output is correct
91 Correct 37 ms 17740 KB Output is correct
92 Correct 48 ms 17356 KB Output is correct
93 Correct 155 ms 38568 KB Output is correct
94 Correct 156 ms 38704 KB Output is correct
95 Correct 166 ms 38572 KB Output is correct
96 Correct 167 ms 38664 KB Output is correct
97 Correct 175 ms 38656 KB Output is correct
98 Correct 184 ms 38584 KB Output is correct
99 Correct 68 ms 38724 KB Output is correct
100 Correct 264 ms 39340 KB Output is correct
101 Correct 263 ms 39848 KB Output is correct
102 Correct 242 ms 40652 KB Output is correct
103 Correct 231 ms 40516 KB Output is correct
104 Correct 210 ms 39464 KB Output is correct
105 Correct 237 ms 39968 KB Output is correct
106 Correct 228 ms 40964 KB Output is correct
107 Correct 275 ms 39924 KB Output is correct
108 Correct 211 ms 40152 KB Output is correct
109 Correct 214 ms 39912 KB Output is correct
110 Correct 232 ms 39844 KB Output is correct
111 Correct 239 ms 39424 KB Output is correct