oj.uz

Submission #853885

# Submission time Handle Problem Language Result Execution time Memory
853885 2023-09-25T11:54:03 Z mychecksedad Event Hopping (BOI22_events) C++17
100 / 100
 131 ms 26248 KB 
/* Author : Mychecksdead */
#include<bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
typedef long long int ll;
typedef long double ld;
#define MOD1 (1000000000+7)
#define MOD (998244353)
#define PI 3.1415926535
#define pb push_back
#define setp() cout << setprecision(15)
#define all(x) x.begin(), x.end()
#define debug(x) cerr << #x << " is " << x << '\n';
const int N = 1e6+100, M = 1e5+10, F = 2147483646, K = 20;
 
 
int n, q, t[N], up[N][K];
array<int, 3> a[N], b[N]; // original, sorted by r;
vector<int> all;
 
void build(int l, int r, int k){
    if(l==r){
        t[k] = MOD;
        return;
    }
    int m = (l+r)>>1;
    build(l, m, k<<1);
    build(m+1, r, k<<1|1);
    t[k] = MOD;
}
int get(int l, int r, int ql, int qr, int k){
    if(ql > r || l > qr) return MOD;
    if(ql <= l && r <= qr) return t[k];
    int m = (l+r)>>1;
    return min(get(l, m, ql, qr, k<<1), get(m + 1, r, ql, qr, k<<1|1));
}
 
void update(int l, int r, int p, int k, int val){
    if(p > r || l > p) return;
    if(l == r){
        t[k] = min(t[k], val);
        return;
    }
    int m = (l+r)>>1;
    update(l, m, p, k<<1, val);
    update(m+1, r, p, k<<1|1, val);
    t[k] = min(t[k<<1], t[k<<1|1]);
}
 
bool comp(const array<int, 3> &a, const array<int, 3> &b){
    if(a[1] != b[1])
        return a[1] < b[1];
    return a[0] < b[0];
}
 
void solve(){
    cin >> n >> q;
    for(int i = 1; i <= n; ++i){
        cin >> a[i][0] >> a[i][1];
        all.pb(a[i][0]);
        all.pb(a[i][1]);
        a[i][2] = i;
    }
    
    sort(all(all));
    unique(all(all));
    build(1, 2*n, 1);
 
    for(int i = 1; i <= n; ++i){
        a[i][0] = lower_bound(all(all), a[i][0]) - all.begin() + 1;
        a[i][1] = lower_bound(all(all), a[i][1]) - all.begin() + 1;
        b[i] = a[i];
    }
 
    sort(b + 1, b + 1 + n);
 
    for(int i = 1; i <= n; ++i){
        update(1, 2*n, b[i][1], 1, i);
        a[b[i][2]][2] = i;
    }
    
    for(int i = 1; i <= n; ++i){
        int p = get(1, 2*n, b[i][0], b[i][1], 1);
        up[i][0] = p;
    }

    for(int j = 1; j < K; ++j) for(int i = 1; i <= n; ++i) up[i][j] = up[up[i][j - 1]][j - 1];
    for(;q--;){
        int start, end; cin >> start >> end;
        if(start == end) cout << "0\n";
        else if(a[start][1] > a[end][1]) cout << "impossible\n";
        else if(a[start][1] >= a[end][0]) cout << "1\n";
        else{
            int v = a[end][2], ans = 0;
            for(int j = K - 1; j >= 0; --j){
                if(up[v][j] == v) break;
                if(b[up[v][j]][0] > a[start][1]) v = up[v][j], ans += (1<<j);
            }
            if(b[up[v][0]][0] > a[start][1]){
              cout << "impossible\n";
            }else 
            cout << ans + 2 << '\n';
        }
    }
}
 
 
 
 
int main(){
    cin.tie(0); ios::sync_with_stdio(0);
    int T = 1, aa;
    // cin >> T;aa=T;
    while(T--){
        // cout << "Case #" << aa-T << ": ";
        solve();
    }
    return 0;
 
}

Compilation message

events.cpp: In function 'int main()':
events.cpp:113:16: warning: unused variable 'aa' [-Wunused-variable]
  113 |     int T = 1, aa;
      |                ^~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6488 KB Output is correct
2 Correct 109 ms 25624 KB Output is correct
3 Correct 105 ms 25296 KB Output is correct
4 Correct 110 ms 25288 KB Output is correct
5 Correct 107 ms 25548 KB Output is correct
6 Correct 115 ms 25652 KB Output is correct
7 Correct 110 ms 25548 KB Output is correct
8 Correct 101 ms 25808 KB Output is correct
9 Correct 102 ms 25800 KB Output is correct
10 Correct 110 ms 25808 KB Output is correct
11 Correct 106 ms 22988 KB Output is correct
12 Correct 68 ms 22992 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6608 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 2 ms 6492 KB Output is correct
5 Correct 1 ms 6488 KB Output is correct
6 Correct 2 ms 6488 KB Output is correct
7 Correct 2 ms 6492 KB Output is correct
8 Correct 2 ms 6492 KB Output is correct
9 Correct 1 ms 6488 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6608 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 2 ms 6492 KB Output is correct
5 Correct 1 ms 6488 KB Output is correct
6 Correct 2 ms 6488 KB Output is correct
7 Correct 2 ms 6492 KB Output is correct
8 Correct 2 ms 6492 KB Output is correct
9 Correct 1 ms 6488 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct
11 Correct 1 ms 6492 KB Output is correct
12 Correct 1 ms 6492 KB Output is correct
13 Correct 2 ms 6492 KB Output is correct
14 Correct 2 ms 6492 KB Output is correct
15 Correct 2 ms 6492 KB Output is correct
16 Correct 2 ms 6492 KB Output is correct
17 Correct 2 ms 6628 KB Output is correct
18 Correct 1 ms 6492 KB Output is correct
19 Correct 27 ms 8024 KB Output is correct
20 Correct 24 ms 8284 KB Output is correct
21 Correct 27 ms 8540 KB Output is correct
22 Correct 20 ms 8540 KB Output is correct
23 Correct 20 ms 8348 KB Output is correct
24 Correct 18 ms 8284 KB Output is correct
25 Correct 23 ms 8028 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6608 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 2 ms 6492 KB Output is correct
5 Correct 1 ms 6488 KB Output is correct
6 Correct 2 ms 6488 KB Output is correct
7 Correct 2 ms 6492 KB Output is correct
8 Correct 2 ms 6492 KB Output is correct
9 Correct 1 ms 6488 KB Output is correct
10 Correct 1 ms 6624 KB Output is correct
11 Correct 1 ms 6492 KB Output is correct
12 Correct 2 ms 6492 KB Output is correct
13 Correct 2 ms 6492 KB Output is correct
14 Correct 1 ms 6492 KB Output is correct
15 Correct 2 ms 6492 KB Output is correct
16 Correct 2 ms 6492 KB Output is correct
17 Correct 2 ms 6492 KB Output is correct
18 Correct 1 ms 6492 KB Output is correct
19 Correct 89 ms 24012 KB Output is correct
20 Correct 84 ms 23204 KB Output is correct
21 Correct 95 ms 24284 KB Output is correct
22 Correct 86 ms 23992 KB Output is correct
23 Correct 97 ms 24000 KB Output is correct
24 Correct 99 ms 23760 KB Output is correct
25 Correct 50 ms 23248 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 112 ms 25296 KB Output is correct
2 Correct 105 ms 25480 KB Output is correct
3 Correct 112 ms 25224 KB Output is correct
4 Correct 103 ms 26008 KB Output is correct
5 Correct 111 ms 25736 KB Output is correct
6 Correct 121 ms 22736 KB Output is correct
7 Correct 131 ms 22728 KB Output is correct
8 Correct 118 ms 22732 KB Output is correct
9 Correct 97 ms 21904 KB Output is correct
10 Correct 114 ms 22220 KB Output is correct
11 Correct 118 ms 22220 KB Output is correct
12 Correct 114 ms 22392 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6488 KB Output is correct
2 Correct 109 ms 25624 KB Output is correct
3 Correct 105 ms 25296 KB Output is correct
4 Correct 110 ms 25288 KB Output is correct
5 Correct 107 ms 25548 KB Output is correct
6 Correct 115 ms 25652 KB Output is correct
7 Correct 110 ms 25548 KB Output is correct
8 Correct 101 ms 25808 KB Output is correct
9 Correct 102 ms 25800 KB Output is correct
10 Correct 110 ms 25808 KB Output is correct
11 Correct 106 ms 22988 KB Output is correct
12 Correct 68 ms 22992 KB Output is correct
13 Correct 1 ms 6608 KB Output is correct
14 Correct 1 ms 6492 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 2 ms 6492 KB Output is correct
17 Correct 1 ms 6488 KB Output is correct
18 Correct 2 ms 6488 KB Output is correct
19 Correct 2 ms 6492 KB Output is correct
20 Correct 2 ms 6492 KB Output is correct
21 Correct 1 ms 6488 KB Output is correct
22 Correct 1 ms 6492 KB Output is correct
23 Correct 1 ms 6492 KB Output is correct
24 Correct 1 ms 6492 KB Output is correct
25 Correct 2 ms 6492 KB Output is correct
26 Correct 2 ms 6492 KB Output is correct
27 Correct 2 ms 6492 KB Output is correct
28 Correct 2 ms 6492 KB Output is correct
29 Correct 2 ms 6628 KB Output is correct
30 Correct 1 ms 6492 KB Output is correct
31 Correct 27 ms 8024 KB Output is correct
32 Correct 24 ms 8284 KB Output is correct
33 Correct 27 ms 8540 KB Output is correct
34 Correct 20 ms 8540 KB Output is correct
35 Correct 20 ms 8348 KB Output is correct
36 Correct 18 ms 8284 KB Output is correct
37 Correct 23 ms 8028 KB Output is correct
38 Correct 1 ms 6624 KB Output is correct
39 Correct 1 ms 6492 KB Output is correct
40 Correct 2 ms 6492 KB Output is correct
41 Correct 2 ms 6492 KB Output is correct
42 Correct 1 ms 6492 KB Output is correct
43 Correct 2 ms 6492 KB Output is correct
44 Correct 2 ms 6492 KB Output is correct
45 Correct 2 ms 6492 KB Output is correct
46 Correct 1 ms 6492 KB Output is correct
47 Correct 89 ms 24012 KB Output is correct
48 Correct 84 ms 23204 KB Output is correct
49 Correct 95 ms 24284 KB Output is correct
50 Correct 86 ms 23992 KB Output is correct
51 Correct 97 ms 24000 KB Output is correct
52 Correct 99 ms 23760 KB Output is correct
53 Correct 50 ms 23248 KB Output is correct
54 Correct 112 ms 25296 KB Output is correct
55 Correct 105 ms 25480 KB Output is correct
56 Correct 112 ms 25224 KB Output is correct
57 Correct 103 ms 26008 KB Output is correct
58 Correct 111 ms 25736 KB Output is correct
59 Correct 121 ms 22736 KB Output is correct
60 Correct 131 ms 22728 KB Output is correct
61 Correct 118 ms 22732 KB Output is correct
62 Correct 97 ms 21904 KB Output is correct
63 Correct 114 ms 22220 KB Output is correct
64 Correct 118 ms 22220 KB Output is correct
65 Correct 114 ms 22392 KB Output is correct
66 Correct 1 ms 6488 KB Output is correct
67 Correct 105 ms 25552 KB Output is correct
68 Correct 105 ms 25548 KB Output is correct
69 Correct 118 ms 25756 KB Output is correct
70 Correct 107 ms 25740 KB Output is correct
71 Correct 106 ms 25804 KB Output is correct
72 Correct 107 ms 25804 KB Output is correct
73 Correct 100 ms 26060 KB Output is correct
74 Correct 101 ms 26248 KB Output is correct
75 Correct 109 ms 26056 KB Output is correct
76 Correct 107 ms 26064 KB Output is correct
77 Correct 68 ms 25500 KB Output is correct
78 Correct 1 ms 6492 KB Output is correct
79 Correct 2 ms 6492 KB Output is correct
80 Correct 1 ms 6620 KB Output is correct
81 Correct 1 ms 6492 KB Output is correct
82 Correct 2 ms 6492 KB Output is correct
83 Correct 2 ms 6492 KB Output is correct
84 Correct 2 ms 6492 KB Output is correct
85 Correct 1 ms 6492 KB Output is correct
86 Correct 28 ms 8152 KB Output is correct
87 Correct 24 ms 8288 KB Output is correct
88 Correct 27 ms 8720 KB Output is correct
89 Correct 20 ms 8532 KB Output is correct
90 Correct 20 ms 8276 KB Output is correct
91 Correct 19 ms 8284 KB Output is correct
92 Correct 24 ms 8276 KB Output is correct
93 Correct 86 ms 24004 KB Output is correct
94 Correct 91 ms 23480 KB Output is correct
95 Correct 96 ms 23892 KB Output is correct
96 Correct 86 ms 24012 KB Output is correct
97 Correct 98 ms 23804 KB Output is correct
98 Correct 95 ms 24008 KB Output is correct
99 Correct 51 ms 23244 KB Output is correct
100 Correct 120 ms 25808 KB Output is correct
101 Correct 120 ms 25808 KB Output is correct
102 Correct 115 ms 25996 KB Output is correct
103 Correct 117 ms 25496 KB Output is correct
104 Correct 121 ms 25292 KB Output is correct
105 Correct 115 ms 25296 KB Output is correct
106 Correct 114 ms 25292 KB Output is correct
107 Correct 112 ms 25028 KB Output is correct
108 Correct 109 ms 25888 KB Output is correct
109 Correct 112 ms 25884 KB Output is correct
110 Correct 123 ms 25544 KB Output is correct
111 Correct 125 ms 25548 KB Output is correct