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Submission #676536

# Submission time Handle Problem Language Result Execution time Memory
676536 2022-12-31T08:20:53 Z PoonYaPat Event Hopping (BOI22_events) C++14
100 / 100
 349 ms 31512 KB 
#include <bits/stdc++.h>
using namespace std;
typedef pair<int,int> pii;

int n,q;
pii s[1<<20];
pii pos[200001],com_pos[200001];
int jump[200001][20];
map<int,int> com;

void update(int l, int r, int idx, int x, pii node) {
    if (x>r || x<l) return;
    if (l==r) s[idx]=min(s[idx],node);
    else {
        int mid=(l+r)/2;
        update(l,mid,2*idx,x,node);
        update(mid+1,r,2*idx+1,x,node);
        s[idx]=min(s[2*idx],s[2*idx+1]);
    }
}

pii query(int l, int r, int idx, int x, int y) {
    if (x>r || y<l) return pii(INT_MAX,INT_MAX);
    if (x<=l && r<=y) return s[idx];
    int mid=(l+r)/2;
    return min(query(l,mid,2*idx,x,y),query(mid+1,r,2*idx+1,x,y));
}

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin>>n>>q;
    for (int i=0; i<1<<20; ++i) s[i]=pii(INT_MAX,INT_MAX);
    for (int i=1; i<=n; ++i) {
        int st,ed; cin>>st>>ed;
        pos[i].first=st;
        pos[i].second=ed;
        com[st]=1;
        com[ed]=1;
    }

    int cnt=1;
    for (auto it=com.begin(); it!=com.end(); ++it) (*it).second=cnt++;
    for (int i=1; i<=n; ++i) {
        com_pos[i]=pii(com[pos[i].first],com[pos[i].second]);
        update(1,2*n,1,com_pos[i].second,pii(com_pos[i].first,i));
    }
    for (int i=1; i<=n; ++i) jump[i][0]=query(1,2*n,1,com_pos[i].first,com_pos[i].second).second;

    for (int i=1; i<18; ++i) {
        for (int j=1; j<=n; ++j) {
            jump[j][i]=jump[jump[j][i-1]][i-1];
        }
    }

    while (q--) {
        int st,ed,cnt=1;
        cin>>st>>ed;

        if (com_pos[st].second>com_pos[ed].second) cout<<"impossible\n";
        else if (st==ed) cout<<"0\n";
        else {
            if (com_pos[ed].first>com_pos[st].second) {
                for (int i=17; i>=0; --i) {
                    if (com_pos[jump[ed][i]].first>com_pos[st].second) {
                        ed=jump[ed][i];
                        cnt+=(1<<i);
                    }
                }
                if (com_pos[jump[ed][0]].first<=com_pos[st].second) cout<<cnt+1<<"\n";
                else cout<<"impossible\n";
            } else cout<<"1\n";
        }

    }
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 8532 KB Output is correct
2 Correct 221 ms 23212 KB Output is correct
3 Correct 197 ms 26228 KB Output is correct
4 Correct 254 ms 26244 KB Output is correct
5 Correct 256 ms 26840 KB Output is correct
6 Correct 195 ms 27212 KB Output is correct
7 Correct 225 ms 27484 KB Output is correct
8 Correct 231 ms 31512 KB Output is correct
9 Correct 218 ms 31392 KB Output is correct
10 Correct 212 ms 26672 KB Output is correct
11 Correct 201 ms 28492 KB Output is correct
12 Correct 126 ms 26064 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 8532 KB Output is correct
2 Correct 4 ms 8532 KB Output is correct
3 Correct 5 ms 8660 KB Output is correct
4 Correct 5 ms 8660 KB Output is correct
5 Correct 6 ms 8660 KB Output is correct
6 Correct 6 ms 8660 KB Output is correct
7 Correct 7 ms 8660 KB Output is correct
8 Correct 7 ms 8660 KB Output is correct
9 Correct 4 ms 8592 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 8532 KB Output is correct
2 Correct 4 ms 8532 KB Output is correct
3 Correct 5 ms 8660 KB Output is correct
4 Correct 5 ms 8660 KB Output is correct
5 Correct 6 ms 8660 KB Output is correct
6 Correct 6 ms 8660 KB Output is correct
7 Correct 7 ms 8660 KB Output is correct
8 Correct 7 ms 8660 KB Output is correct
9 Correct 4 ms 8592 KB Output is correct
10 Correct 4 ms 8524 KB Output is correct
11 Correct 4 ms 8520 KB Output is correct
12 Correct 5 ms 8608 KB Output is correct
13 Correct 5 ms 8660 KB Output is correct
14 Correct 5 ms 8660 KB Output is correct
15 Correct 5 ms 8600 KB Output is correct
16 Correct 6 ms 8736 KB Output is correct
17 Correct 5 ms 8660 KB Output is correct
18 Correct 5 ms 8656 KB Output is correct
19 Correct 36 ms 9804 KB Output is correct
20 Correct 35 ms 9800 KB Output is correct
21 Correct 36 ms 9984 KB Output is correct
22 Correct 31 ms 10052 KB Output is correct
23 Correct 30 ms 10100 KB Output is correct
24 Correct 28 ms 10188 KB Output is correct
25 Correct 35 ms 9784 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 8532 KB Output is correct
2 Correct 4 ms 8532 KB Output is correct
3 Correct 5 ms 8660 KB Output is correct
4 Correct 5 ms 8660 KB Output is correct
5 Correct 6 ms 8660 KB Output is correct
6 Correct 6 ms 8660 KB Output is correct
7 Correct 7 ms 8660 KB Output is correct
8 Correct 7 ms 8660 KB Output is correct
9 Correct 4 ms 8592 KB Output is correct
10 Correct 5 ms 8532 KB Output is correct
11 Correct 4 ms 8520 KB Output is correct
12 Correct 5 ms 8572 KB Output is correct
13 Correct 5 ms 8660 KB Output is correct
14 Correct 5 ms 8660 KB Output is correct
15 Correct 5 ms 8660 KB Output is correct
16 Correct 6 ms 8656 KB Output is correct
17 Correct 5 ms 8660 KB Output is correct
18 Correct 4 ms 8532 KB Output is correct
19 Correct 158 ms 22844 KB Output is correct
20 Correct 157 ms 23704 KB Output is correct
21 Correct 190 ms 24384 KB Output is correct
22 Correct 205 ms 26320 KB Output is correct
23 Correct 220 ms 29252 KB Output is correct
24 Correct 247 ms 29216 KB Output is correct
25 Correct 61 ms 19168 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 245 ms 23168 KB Output is correct
2 Correct 193 ms 26320 KB Output is correct
3 Correct 286 ms 26432 KB Output is correct
4 Correct 230 ms 31456 KB Output is correct
5 Correct 197 ms 26592 KB Output is correct
6 Correct 326 ms 31212 KB Output is correct
7 Correct 286 ms 31052 KB Output is correct
8 Correct 349 ms 31372 KB Output is correct
9 Correct 225 ms 29132 KB Output is correct
10 Correct 267 ms 30772 KB Output is correct
11 Correct 282 ms 30600 KB Output is correct
12 Correct 271 ms 30784 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 8532 KB Output is correct
2 Correct 221 ms 23212 KB Output is correct
3 Correct 197 ms 26228 KB Output is correct
4 Correct 254 ms 26244 KB Output is correct
5 Correct 256 ms 26840 KB Output is correct
6 Correct 195 ms 27212 KB Output is correct
7 Correct 225 ms 27484 KB Output is correct
8 Correct 231 ms 31512 KB Output is correct
9 Correct 218 ms 31392 KB Output is correct
10 Correct 212 ms 26672 KB Output is correct
11 Correct 201 ms 28492 KB Output is correct
12 Correct 126 ms 26064 KB Output is correct
13 Correct 5 ms 8532 KB Output is correct
14 Correct 4 ms 8532 KB Output is correct
15 Correct 5 ms 8660 KB Output is correct
16 Correct 5 ms 8660 KB Output is correct
17 Correct 6 ms 8660 KB Output is correct
18 Correct 6 ms 8660 KB Output is correct
19 Correct 7 ms 8660 KB Output is correct
20 Correct 7 ms 8660 KB Output is correct
21 Correct 4 ms 8592 KB Output is correct
22 Correct 4 ms 8524 KB Output is correct
23 Correct 4 ms 8520 KB Output is correct
24 Correct 5 ms 8608 KB Output is correct
25 Correct 5 ms 8660 KB Output is correct
26 Correct 5 ms 8660 KB Output is correct
27 Correct 5 ms 8600 KB Output is correct
28 Correct 6 ms 8736 KB Output is correct
29 Correct 5 ms 8660 KB Output is correct
30 Correct 5 ms 8656 KB Output is correct
31 Correct 36 ms 9804 KB Output is correct
32 Correct 35 ms 9800 KB Output is correct
33 Correct 36 ms 9984 KB Output is correct
34 Correct 31 ms 10052 KB Output is correct
35 Correct 30 ms 10100 KB Output is correct
36 Correct 28 ms 10188 KB Output is correct
37 Correct 35 ms 9784 KB Output is correct
38 Correct 5 ms 8532 KB Output is correct
39 Correct 4 ms 8520 KB Output is correct
40 Correct 5 ms 8572 KB Output is correct
41 Correct 5 ms 8660 KB Output is correct
42 Correct 5 ms 8660 KB Output is correct
43 Correct 5 ms 8660 KB Output is correct
44 Correct 6 ms 8656 KB Output is correct
45 Correct 5 ms 8660 KB Output is correct
46 Correct 4 ms 8532 KB Output is correct
47 Correct 158 ms 22844 KB Output is correct
48 Correct 157 ms 23704 KB Output is correct
49 Correct 190 ms 24384 KB Output is correct
50 Correct 205 ms 26320 KB Output is correct
51 Correct 220 ms 29252 KB Output is correct
52 Correct 247 ms 29216 KB Output is correct
53 Correct 61 ms 19168 KB Output is correct
54 Correct 245 ms 23168 KB Output is correct
55 Correct 193 ms 26320 KB Output is correct
56 Correct 286 ms 26432 KB Output is correct
57 Correct 230 ms 31456 KB Output is correct
58 Correct 197 ms 26592 KB Output is correct
59 Correct 326 ms 31212 KB Output is correct
60 Correct 286 ms 31052 KB Output is correct
61 Correct 349 ms 31372 KB Output is correct
62 Correct 225 ms 29132 KB Output is correct
63 Correct 267 ms 30772 KB Output is correct
64 Correct 282 ms 30600 KB Output is correct
65 Correct 271 ms 30784 KB Output is correct
66 Correct 5 ms 8532 KB Output is correct
67 Correct 182 ms 26264 KB Output is correct
68 Correct 204 ms 26328 KB Output is correct
69 Correct 207 ms 26212 KB Output is correct
70 Correct 245 ms 26780 KB Output is correct
71 Correct 236 ms 27260 KB Output is correct
72 Correct 211 ms 27444 KB Output is correct
73 Correct 231 ms 31472 KB Output is correct
74 Correct 257 ms 31476 KB Output is correct
75 Correct 189 ms 26688 KB Output is correct
76 Correct 226 ms 28568 KB Output is correct
77 Correct 124 ms 26056 KB Output is correct
78 Correct 4 ms 8532 KB Output is correct
79 Correct 6 ms 8660 KB Output is correct
80 Correct 5 ms 8660 KB Output is correct
81 Correct 5 ms 8660 KB Output is correct
82 Correct 6 ms 8660 KB Output is correct
83 Correct 6 ms 8660 KB Output is correct
84 Correct 6 ms 8660 KB Output is correct
85 Correct 4 ms 8660 KB Output is correct
86 Correct 37 ms 10748 KB Output is correct
87 Correct 35 ms 10736 KB Output is correct
88 Correct 36 ms 10924 KB Output is correct
89 Correct 31 ms 11108 KB Output is correct
90 Correct 30 ms 11108 KB Output is correct
91 Correct 29 ms 11140 KB Output is correct
92 Correct 33 ms 10796 KB Output is correct
93 Correct 150 ms 24504 KB Output is correct
94 Correct 145 ms 23656 KB Output is correct
95 Correct 184 ms 24472 KB Output is correct
96 Correct 232 ms 26244 KB Output is correct
97 Correct 258 ms 29168 KB Output is correct
98 Correct 260 ms 29232 KB Output is correct
99 Correct 60 ms 19084 KB Output is correct
100 Correct 304 ms 31152 KB Output is correct
101 Correct 314 ms 31104 KB Output is correct
102 Correct 280 ms 31272 KB Output is correct
103 Correct 310 ms 30776 KB Output is correct
104 Correct 279 ms 30572 KB Output is correct
105 Correct 292 ms 30760 KB Output is correct
106 Correct 184 ms 24540 KB Output is correct
107 Correct 217 ms 25768 KB Output is correct
108 Correct 212 ms 26516 KB Output is correct
109 Correct 233 ms 26384 KB Output is correct
110 Correct 344 ms 30960 KB Output is correct
111 Correct 307 ms 31052 KB Output is correct