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Submission #584395

# Submission time Handle Problem Language Result Execution time Memory
584395 2022-06-27T10:33:45 Z alireza_kaviani Event Hopping (BOI22_events) C++17
100 / 100
 141 ms 13616 KB 
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<ll, ll> pll;
typedef pair<int, int> pii;

#define all(x)      (x).begin(),(x).end()
#define X           first
#define Y           second
#define sep         ' '
#define endl        '\n'
#define SZ(x)       ll(x.size())

const ll MAXN = 1e6 + 10;
const ll LOG = 22;
const ll INF = 8e18;
const ll MOD = 1e9 + 7; //998244353; //1e9 + 9;

int n , q , S[MAXN] , E[MAXN] , nxt[LOG][MAXN];
vector<pair<pii , int>> stk;
vector<int> vec;

int cmp(int x , int y){
    if(E[x] != E[y])    return E[x] < E[y];
    return S[x] < S[y];
}

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

    cin >> n >> q;
    for(int i = 1 ; i <= n ; i++){
        cin >> S[i] >> E[i];
        vec.push_back(i);
    }
    sort(all(vec) , cmp);
    for(auto& i : vec){
        while(SZ(stk) && S[i] <= stk.back().X.Y){
            stk.pop_back();
        }
        stk.push_back({{E[i] , S[i]} , i});
        nxt[0][i] = lower_bound(all(stk) , pair<pii , int>({{S[i] , -MOD} , -MOD})) -> Y;
        //cout << i << sep << nxt[0][i] << endl;
    }
    for(int i = 1 ; i < LOG ; i++){
        for(int j = 1 ; j <= n ; j++){
            nxt[i][j] = nxt[i - 1][nxt[i - 1][j]];
        }
    }
    while(q--){
        int v , u;
        cin >> v >> u;
        if(E[u] < E[v]){
            cout << "impossible" << endl;
            continue;
        }
        if(v == u){
            cout << 0 << endl;
            continue;
        }
        if(S[u] <= E[v]){
            cout << 1 << endl;
            continue;
        }
        int ans = 0;
        for(int i = LOG - 1 ; i >= 0 ; i--){
            if(S[nxt[i][u]] > E[v]){
                u = nxt[i][u];
                ans += (1 << i);
            }
        }
        if(E[v] < S[nxt[0][u]]){
            cout << "impossible" << endl;
            continue;
        }
        cout << ans + 2 << endl;
    }

    return 0;
}
/*

*/

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 468 KB Output is correct
2 Correct 68 ms 12600 KB Output is correct
3 Correct 89 ms 12912 KB Output is correct
4 Correct 123 ms 13044 KB Output is correct
5 Correct 94 ms 12808 KB Output is correct
6 Correct 102 ms 12852 KB Output is correct
7 Correct 92 ms 12628 KB Output is correct
8 Correct 121 ms 13568 KB Output is correct
9 Correct 112 ms 13616 KB Output is correct
10 Correct 97 ms 13496 KB Output is correct
11 Correct 99 ms 13040 KB Output is correct
12 Correct 61 ms 12596 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 468 KB Output is correct
2 Correct 0 ms 468 KB Output is correct
3 Correct 1 ms 596 KB Output is correct
4 Correct 1 ms 596 KB Output is correct
5 Correct 1 ms 596 KB Output is correct
6 Correct 1 ms 596 KB Output is correct
7 Correct 1 ms 596 KB Output is correct
8 Correct 1 ms 596 KB Output is correct
9 Correct 1 ms 596 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 468 KB Output is correct
2 Correct 0 ms 468 KB Output is correct
3 Correct 1 ms 596 KB Output is correct
4 Correct 1 ms 596 KB Output is correct
5 Correct 1 ms 596 KB Output is correct
6 Correct 1 ms 596 KB Output is correct
7 Correct 1 ms 596 KB Output is correct
8 Correct 1 ms 596 KB Output is correct
9 Correct 1 ms 596 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 1 ms 596 KB Output is correct
13 Correct 1 ms 612 KB Output is correct
14 Correct 1 ms 596 KB Output is correct
15 Correct 1 ms 596 KB Output is correct
16 Correct 1 ms 596 KB Output is correct
17 Correct 1 ms 596 KB Output is correct
18 Correct 1 ms 596 KB Output is correct
19 Correct 33 ms 1796 KB Output is correct
20 Correct 34 ms 1684 KB Output is correct
21 Correct 33 ms 1908 KB Output is correct
22 Correct 29 ms 2060 KB Output is correct
23 Correct 23 ms 1744 KB Output is correct
24 Correct 22 ms 1936 KB Output is correct
25 Correct 26 ms 1484 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 468 KB Output is correct
2 Correct 0 ms 468 KB Output is correct
3 Correct 1 ms 596 KB Output is correct
4 Correct 1 ms 596 KB Output is correct
5 Correct 1 ms 596 KB Output is correct
6 Correct 1 ms 596 KB Output is correct
7 Correct 1 ms 596 KB Output is correct
8 Correct 1 ms 596 KB Output is correct
9 Correct 1 ms 596 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 1 ms 612 KB Output is correct
13 Correct 1 ms 596 KB Output is correct
14 Correct 1 ms 596 KB Output is correct
15 Correct 1 ms 596 KB Output is correct
16 Correct 1 ms 596 KB Output is correct
17 Correct 1 ms 596 KB Output is correct
18 Correct 1 ms 596 KB Output is correct
19 Correct 43 ms 12612 KB Output is correct
20 Correct 37 ms 12184 KB Output is correct
21 Correct 43 ms 10740 KB Output is correct
22 Correct 41 ms 11620 KB Output is correct
23 Correct 44 ms 12280 KB Output is correct
24 Correct 40 ms 12548 KB Output is correct
25 Correct 26 ms 10500 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 67 ms 12768 KB Output is correct
2 Correct 90 ms 12684 KB Output is correct
3 Correct 141 ms 12776 KB Output is correct
4 Correct 116 ms 13076 KB Output is correct
5 Correct 102 ms 13028 KB Output is correct
6 Correct 97 ms 13072 KB Output is correct
7 Correct 91 ms 12868 KB Output is correct
8 Correct 89 ms 13040 KB Output is correct
9 Correct 47 ms 12140 KB Output is correct
10 Correct 92 ms 12900 KB Output is correct
11 Correct 78 ms 12612 KB Output is correct
12 Correct 83 ms 12484 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 468 KB Output is correct
2 Correct 68 ms 12600 KB Output is correct
3 Correct 89 ms 12912 KB Output is correct
4 Correct 123 ms 13044 KB Output is correct
5 Correct 94 ms 12808 KB Output is correct
6 Correct 102 ms 12852 KB Output is correct
7 Correct 92 ms 12628 KB Output is correct
8 Correct 121 ms 13568 KB Output is correct
9 Correct 112 ms 13616 KB Output is correct
10 Correct 97 ms 13496 KB Output is correct
11 Correct 99 ms 13040 KB Output is correct
12 Correct 61 ms 12596 KB Output is correct
13 Correct 0 ms 468 KB Output is correct
14 Correct 0 ms 468 KB Output is correct
15 Correct 1 ms 596 KB Output is correct
16 Correct 1 ms 596 KB Output is correct
17 Correct 1 ms 596 KB Output is correct
18 Correct 1 ms 596 KB Output is correct
19 Correct 1 ms 596 KB Output is correct
20 Correct 1 ms 596 KB Output is correct
21 Correct 1 ms 596 KB Output is correct
22 Correct 1 ms 468 KB Output is correct
23 Correct 1 ms 468 KB Output is correct
24 Correct 1 ms 596 KB Output is correct
25 Correct 1 ms 612 KB Output is correct
26 Correct 1 ms 596 KB Output is correct
27 Correct 1 ms 596 KB Output is correct
28 Correct 1 ms 596 KB Output is correct
29 Correct 1 ms 596 KB Output is correct
30 Correct 1 ms 596 KB Output is correct
31 Correct 33 ms 1796 KB Output is correct
32 Correct 34 ms 1684 KB Output is correct
33 Correct 33 ms 1908 KB Output is correct
34 Correct 29 ms 2060 KB Output is correct
35 Correct 23 ms 1744 KB Output is correct
36 Correct 22 ms 1936 KB Output is correct
37 Correct 26 ms 1484 KB Output is correct
38 Correct 1 ms 468 KB Output is correct
39 Correct 1 ms 468 KB Output is correct
40 Correct 1 ms 612 KB Output is correct
41 Correct 1 ms 596 KB Output is correct
42 Correct 1 ms 596 KB Output is correct
43 Correct 1 ms 596 KB Output is correct
44 Correct 1 ms 596 KB Output is correct
45 Correct 1 ms 596 KB Output is correct
46 Correct 1 ms 596 KB Output is correct
47 Correct 43 ms 12612 KB Output is correct
48 Correct 37 ms 12184 KB Output is correct
49 Correct 43 ms 10740 KB Output is correct
50 Correct 41 ms 11620 KB Output is correct
51 Correct 44 ms 12280 KB Output is correct
52 Correct 40 ms 12548 KB Output is correct
53 Correct 26 ms 10500 KB Output is correct
54 Correct 67 ms 12768 KB Output is correct
55 Correct 90 ms 12684 KB Output is correct
56 Correct 141 ms 12776 KB Output is correct
57 Correct 116 ms 13076 KB Output is correct
58 Correct 102 ms 13028 KB Output is correct
59 Correct 97 ms 13072 KB Output is correct
60 Correct 91 ms 12868 KB Output is correct
61 Correct 89 ms 13040 KB Output is correct
62 Correct 47 ms 12140 KB Output is correct
63 Correct 92 ms 12900 KB Output is correct
64 Correct 78 ms 12612 KB Output is correct
65 Correct 83 ms 12484 KB Output is correct
66 Correct 1 ms 468 KB Output is correct
67 Correct 80 ms 12772 KB Output is correct
68 Correct 104 ms 13008 KB Output is correct
69 Correct 120 ms 12656 KB Output is correct
70 Correct 95 ms 13092 KB Output is correct
71 Correct 114 ms 12708 KB Output is correct
72 Correct 90 ms 13108 KB Output is correct
73 Correct 110 ms 13200 KB Output is correct
74 Correct 124 ms 13272 KB Output is correct
75 Correct 105 ms 13192 KB Output is correct
76 Correct 93 ms 12488 KB Output is correct
77 Correct 55 ms 12456 KB Output is correct
78 Correct 0 ms 468 KB Output is correct
79 Correct 1 ms 596 KB Output is correct
80 Correct 2 ms 596 KB Output is correct
81 Correct 1 ms 596 KB Output is correct
82 Correct 1 ms 596 KB Output is correct
83 Correct 1 ms 616 KB Output is correct
84 Correct 1 ms 620 KB Output is correct
85 Correct 1 ms 596 KB Output is correct
86 Correct 32 ms 1620 KB Output is correct
87 Correct 32 ms 1612 KB Output is correct
88 Correct 34 ms 1964 KB Output is correct
89 Correct 36 ms 1996 KB Output is correct
90 Correct 25 ms 1720 KB Output is correct
91 Correct 23 ms 1828 KB Output is correct
92 Correct 27 ms 1400 KB Output is correct
93 Correct 46 ms 11936 KB Output is correct
94 Correct 40 ms 11852 KB Output is correct
95 Correct 46 ms 10548 KB Output is correct
96 Correct 41 ms 11524 KB Output is correct
97 Correct 42 ms 12220 KB Output is correct
98 Correct 40 ms 11980 KB Output is correct
99 Correct 26 ms 10572 KB Output is correct
100 Correct 112 ms 12956 KB Output is correct
101 Correct 90 ms 13316 KB Output is correct
102 Correct 94 ms 13440 KB Output is correct
103 Correct 89 ms 12940 KB Output is correct
104 Correct 85 ms 12944 KB Output is correct
105 Correct 80 ms 12932 KB Output is correct
106 Correct 90 ms 12924 KB Output is correct
107 Correct 106 ms 13340 KB Output is correct
108 Correct 100 ms 11864 KB Output is correct
109 Correct 89 ms 11884 KB Output is correct
110 Correct 68 ms 11768 KB Output is correct
111 Correct 64 ms 11356 KB Output is correct