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Submission #576876

# Submission time Handle Problem Language Result Execution time Memory
576876 2022-06-13T16:56:42 Z wiwiho Event Hopping (BOI22_events) C++14
100 / 100
 198 ms 26936 KB 
#include <bits/stdc++.h>

#define iter(a) a.begin(), a.end()
#define lsort(a) sort(iter(a))
#define gsort(a) sort(iter(a), greater<>())
#define eb emplace_back
#define pob pop_back()
#define ef emplace_front
#define pof pop_front()
#define mp make_pair
#define F first
#define S second
#define uni(a) a.resize(unique(iter(a)) - a.begin())
#define printv(a, b) { \
    for(auto pv : a) b << pv << " "; \
    b << "\n"; \
}

using namespace std;

typedef long long ll;

using pii = pair<int, int>;
using pll = pair<ll, ll>;

struct SparseTable{
    
    vector<vector<pii>> st;
    int n;
    
    SparseTable(vector<pii>& a){
        n = a.size();
        st.resize(20, vector<pii>(n));
        st[0] = a;
        for(int i = 1; i < 20; i++){
            for(int j = 0; j + (1 << i) - 1 < n; j++){
                st[i][j] = min(st[i - 1][j], st[i - 1][j + (1 << (i - 1))]);
            }
        }
    }

    pii query(int l, int r){
        int lg = __lg(r - l + 1);
        return min(st[lg][l], st[lg][r - (1 << lg) + 1]);
    }

};

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    int n, q;
    cin >> n >> q;

    vector<int> l(n + 1), r(n + 1);
    vector<vector<int>> anc(20, vector<int>(n + 1));
    for(int i = 1; i <= n; i++){
        cin >> l[i] >> r[i];
    }
    vector<int> dr = r;
    lsort(dr);
    uni(dr);
    int sz = dr.size();
    vector<pii> mn(sz, mp(INT_MAX, -1));
    for(int i = 1; i <= n; i++){
        int pos = lower_bound(iter(dr), r[i]) - dr.begin();
        mn[pos] = min(mn[pos], mp(l[i], i));
    }
    
    SparseTable st(mn);
    for(int i = 1; i <= n; i++){
        int lp = lower_bound(iter(dr), l[i]) - dr.begin();
        int rp = lower_bound(iter(dr), r[i]) - dr.begin();
        anc[0][i] = st.query(lp, rp).S;
        if(anc[0][i] == i) anc[0][i] = -1;
    }
    
    for(int i = 1; i < 20; i++){
        for(int j = 1; j <= n; j++){
            if(anc[i - 1][j] == -1) anc[i][j] = -1;
            else anc[i][j] = anc[i - 1][anc[i - 1][j]];
        }
    }

    while(q--){

        int s, e;
        cin >> s >> e;
        
        if(s == e){
            cout << "0\n";
            continue;
        }
        if(r[s] > r[e]){
            cout << "impossible\n";
            continue;
        }
    
        int ans = 0;
        int now = e;
        for(int i = 19; i >= 0; i--){
            if(anc[i][now] == -1) continue;
            if(l[anc[i][now]] <= r[s]) continue;
            now = anc[i][now];
            ans += 1 << i;
        }
        if(r[s] < l[now] && anc[0][now] != -1) ans++, now = anc[0][now];
        if(r[s] < l[now]) cout << "impossible\n";
        else cout << ans + 1 << "\n";
    }
    
    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 101 ms 26512 KB Output is correct
3 Correct 127 ms 26512 KB Output is correct
4 Correct 198 ms 26512 KB Output is correct
5 Correct 165 ms 26632 KB Output is correct
6 Correct 150 ms 26508 KB Output is correct
7 Correct 127 ms 26516 KB Output is correct
8 Correct 121 ms 26936 KB Output is correct
9 Correct 110 ms 26868 KB Output is correct
10 Correct 144 ms 26756 KB Output is correct
11 Correct 136 ms 26740 KB Output is correct
12 Correct 58 ms 19020 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 340 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 2 ms 468 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 31 ms 2112 KB Output is correct
20 Correct 46 ms 2088 KB Output is correct
21 Correct 37 ms 2360 KB Output is correct
22 Correct 26 ms 1892 KB Output is correct
23 Correct 28 ms 2256 KB Output is correct
24 Correct 23 ms 2224 KB Output is correct
25 Correct 36 ms 1840 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 468 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 2 ms 468 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 82 ms 26520 KB Output is correct
20 Correct 69 ms 26508 KB Output is correct
21 Correct 82 ms 17964 KB Output is correct
22 Correct 91 ms 26624 KB Output is correct
23 Correct 79 ms 26612 KB Output is correct
24 Correct 89 ms 26624 KB Output is correct
25 Correct 34 ms 9300 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 110 ms 26516 KB Output is correct
2 Correct 122 ms 26564 KB Output is correct
3 Correct 182 ms 26636 KB Output is correct
4 Correct 111 ms 26868 KB Output is correct
5 Correct 175 ms 26740 KB Output is correct
6 Correct 136 ms 26620 KB Output is correct
7 Correct 138 ms 26552 KB Output is correct
8 Correct 129 ms 26608 KB Output is correct
9 Correct 80 ms 26512 KB Output is correct
10 Correct 139 ms 26664 KB Output is correct
11 Correct 124 ms 26628 KB Output is correct
12 Correct 142 ms 26612 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 101 ms 26512 KB Output is correct
3 Correct 127 ms 26512 KB Output is correct
4 Correct 198 ms 26512 KB Output is correct
5 Correct 165 ms 26632 KB Output is correct
6 Correct 150 ms 26508 KB Output is correct
7 Correct 127 ms 26516 KB Output is correct
8 Correct 121 ms 26936 KB Output is correct
9 Correct 110 ms 26868 KB Output is correct
10 Correct 144 ms 26756 KB Output is correct
11 Correct 136 ms 26740 KB Output is correct
12 Correct 58 ms 19020 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 2 ms 468 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 1 ms 468 KB Output is correct
20 Correct 1 ms 468 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 212 KB Output is correct
23 Correct 0 ms 212 KB Output is correct
24 Correct 2 ms 468 KB Output is correct
25 Correct 1 ms 468 KB Output is correct
26 Correct 1 ms 468 KB Output is correct
27 Correct 1 ms 468 KB Output is correct
28 Correct 1 ms 468 KB Output is correct
29 Correct 1 ms 468 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 31 ms 2112 KB Output is correct
32 Correct 46 ms 2088 KB Output is correct
33 Correct 37 ms 2360 KB Output is correct
34 Correct 26 ms 1892 KB Output is correct
35 Correct 28 ms 2256 KB Output is correct
36 Correct 23 ms 2224 KB Output is correct
37 Correct 36 ms 1840 KB Output is correct
38 Correct 0 ms 212 KB Output is correct
39 Correct 0 ms 212 KB Output is correct
40 Correct 1 ms 468 KB Output is correct
41 Correct 1 ms 468 KB Output is correct
42 Correct 1 ms 468 KB Output is correct
43 Correct 1 ms 468 KB Output is correct
44 Correct 2 ms 468 KB Output is correct
45 Correct 1 ms 468 KB Output is correct
46 Correct 1 ms 340 KB Output is correct
47 Correct 82 ms 26520 KB Output is correct
48 Correct 69 ms 26508 KB Output is correct
49 Correct 82 ms 17964 KB Output is correct
50 Correct 91 ms 26624 KB Output is correct
51 Correct 79 ms 26612 KB Output is correct
52 Correct 89 ms 26624 KB Output is correct
53 Correct 34 ms 9300 KB Output is correct
54 Correct 110 ms 26516 KB Output is correct
55 Correct 122 ms 26564 KB Output is correct
56 Correct 182 ms 26636 KB Output is correct
57 Correct 111 ms 26868 KB Output is correct
58 Correct 175 ms 26740 KB Output is correct
59 Correct 136 ms 26620 KB Output is correct
60 Correct 138 ms 26552 KB Output is correct
61 Correct 129 ms 26608 KB Output is correct
62 Correct 80 ms 26512 KB Output is correct
63 Correct 139 ms 26664 KB Output is correct
64 Correct 124 ms 26628 KB Output is correct
65 Correct 142 ms 26612 KB Output is correct
66 Correct 1 ms 212 KB Output is correct
67 Correct 104 ms 26616 KB Output is correct
68 Correct 148 ms 26512 KB Output is correct
69 Correct 181 ms 26564 KB Output is correct
70 Correct 147 ms 26512 KB Output is correct
71 Correct 146 ms 26516 KB Output is correct
72 Correct 130 ms 26592 KB Output is correct
73 Correct 113 ms 26860 KB Output is correct
74 Correct 108 ms 26880 KB Output is correct
75 Correct 156 ms 26704 KB Output is correct
76 Correct 145 ms 26732 KB Output is correct
77 Correct 71 ms 18980 KB Output is correct
78 Correct 0 ms 212 KB Output is correct
79 Correct 1 ms 468 KB Output is correct
80 Correct 1 ms 468 KB Output is correct
81 Correct 1 ms 468 KB Output is correct
82 Correct 1 ms 468 KB Output is correct
83 Correct 1 ms 468 KB Output is correct
84 Correct 2 ms 468 KB Output is correct
85 Correct 1 ms 348 KB Output is correct
86 Correct 33 ms 2072 KB Output is correct
87 Correct 33 ms 2004 KB Output is correct
88 Correct 36 ms 2380 KB Output is correct
89 Correct 29 ms 1876 KB Output is correct
90 Correct 29 ms 2168 KB Output is correct
91 Correct 25 ms 2248 KB Output is correct
92 Correct 27 ms 1876 KB Output is correct
93 Correct 76 ms 26628 KB Output is correct
94 Correct 73 ms 26512 KB Output is correct
95 Correct 68 ms 17968 KB Output is correct
96 Correct 78 ms 26620 KB Output is correct
97 Correct 65 ms 26508 KB Output is correct
98 Correct 80 ms 26560 KB Output is correct
99 Correct 27 ms 9300 KB Output is correct
100 Correct 167 ms 26500 KB Output is correct
101 Correct 127 ms 26532 KB Output is correct
102 Correct 113 ms 26620 KB Output is correct
103 Correct 151 ms 26516 KB Output is correct
104 Correct 117 ms 26500 KB Output is correct
105 Correct 126 ms 26504 KB Output is correct
106 Correct 143 ms 22488 KB Output is correct
107 Correct 164 ms 26500 KB Output is correct
108 Correct 102 ms 18700 KB Output is correct
109 Correct 122 ms 18448 KB Output is correct
110 Correct 119 ms 26620 KB Output is correct
111 Correct 115 ms 26516 KB Output is correct