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Submission #714375

# Submission time Handle Problem Language Result Execution time Memory
714375 2023-03-24T09:55:40 Z ibrahim001 Event Hopping (BOI22_events) C++14
100 / 100
 644 ms 23652 KB 
#include "bits/stdc++.h"
#define intt long long
#define pb push_back
#define endl '\n'
#define F first
#define S second
#define pii pair<int,int>
#define pll pair<intt,intt>
#define ld long double
#define fast_io ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
using namespace std;
const int sz = 2e5+5;
const int inf = 1e9+7;
int a[sz], b[sz];
map<int,int> mp;
pii st[sz<<2];
int par[sz][20];
void build(int l, int r, int in){
    st[in]={inf, inf};
    if ( l == r ){
        return;
    }
    int mid = (l+r)>>1;
    build(l, mid, in<<1);
    build(mid+1, r, in<<1|1);
}
void update(int l, int r, int in, int x, int val){
    if ( x > r or x < l )   return;
    if ( l == r ){
        st[in] = min(st[in], {a[val], val});
        return;
    }
    int mid = (l+r)>>1;
    update(l, mid, in<<1, x, val);
    update(mid+1, r, in<<1|1, x, val);
    st[in] = min(st[in<<1], st[in<<1|1]);
}
pii getans(int a, int b, int l, int r, int in){
    if ( l > b or r < a )   return {inf, inf};
    if ( a <= l and r <= b )    return st[in];
    int mid = (l+r)>>1;
    return min(getans(a, b, l, mid, in<<1), getans(a, b, mid+1, r, in<<1|1));
}
int i,j;
int main(){
    int n, q;
    cin >> n >> q;
    for ( i = 1; i <= n; i++ ){
        cin >> a[i] >> b[i];
        mp[a[i]];
        mp[b[i]];
    }
    int cnt = 0;
    for ( pii i : mp ){
        mp[i.F] = ++cnt;
    }
    build(1, n*2, 1);
    for ( i = 1; i <= n; i++ ){
        a[i] = mp[a[i]];
        b[i] = mp[b[i]];
        update(1, n*2, 1, b[i], i);
    }
    for ( i = 1; i <= n; i++ ){
        par[i][0] = getans(a[i], b[i], 1, n*2, 1).S;
        if ( par[i][0] == i )    par[i][0] = 0;
    }
    for ( i = 1; i < 20; i++ ){
        for ( j = 1; j <= n; j++ )  par[j][i] = par[par[j][i-1]][i-1];
    }
    while(q--){
        int x, y;
        cin >> x >> y;
        if ( x == y ){
            cout << 0 << endl;
            continue;
        }
        if ( b[x] > b[y] ){
            cout << "impossible" << endl;
            continue;
        }
        if ( b[x] >= a[y] and b[x] <= b[y] ){
            cout << 1 << endl;
            continue;
        }
        int res = 0;
        for ( i = 19; i >= 0; i-- ){
            if ( a[par[y][i]] > b[x] ){
                y = par[y][i];
                res+=(1<<i);
            }
        }
        y = par[y][0];
        res++;
        if ( y == 0 ){
            cout << "impossible" << endl;
            continue;
        }
        cout << res+1 << endl;
    }
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 484 ms 18416 KB Output is correct
3 Correct 447 ms 18288 KB Output is correct
4 Correct 575 ms 18320 KB Output is correct
5 Correct 447 ms 18876 KB Output is correct
6 Correct 480 ms 19272 KB Output is correct
7 Correct 428 ms 19540 KB Output is correct
8 Correct 483 ms 23652 KB Output is correct
9 Correct 568 ms 23488 KB Output is correct
10 Correct 525 ms 18652 KB Output is correct
11 Correct 491 ms 20620 KB Output is correct
12 Correct 335 ms 18852 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 316 KB Output is correct
3 Correct 3 ms 468 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 2 ms 468 KB Output is correct
7 Correct 3 ms 468 KB Output is correct
8 Correct 3 ms 468 KB Output is correct
9 Correct 2 ms 452 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 316 KB Output is correct
3 Correct 3 ms 468 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 2 ms 468 KB Output is correct
7 Correct 3 ms 468 KB Output is correct
8 Correct 3 ms 468 KB Output is correct
9 Correct 2 ms 452 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 4 ms 468 KB Output is correct
13 Correct 4 ms 448 KB Output is correct
14 Correct 2 ms 448 KB Output is correct
15 Correct 3 ms 456 KB Output is correct
16 Correct 3 ms 468 KB Output is correct
17 Correct 3 ms 468 KB Output is correct
18 Correct 2 ms 340 KB Output is correct
19 Correct 229 ms 1940 KB Output is correct
20 Correct 258 ms 1828 KB Output is correct
21 Correct 221 ms 2008 KB Output is correct
22 Correct 241 ms 2028 KB Output is correct
23 Correct 204 ms 2212 KB Output is correct
24 Correct 258 ms 2096 KB Output is correct
25 Correct 231 ms 1832 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 316 KB Output is correct
3 Correct 3 ms 468 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 2 ms 468 KB Output is correct
7 Correct 3 ms 468 KB Output is correct
8 Correct 3 ms 468 KB Output is correct
9 Correct 2 ms 452 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 3 ms 468 KB Output is correct
13 Correct 3 ms 452 KB Output is correct
14 Correct 3 ms 468 KB Output is correct
15 Correct 3 ms 448 KB Output is correct
16 Correct 3 ms 468 KB Output is correct
17 Correct 8 ms 468 KB Output is correct
18 Correct 2 ms 340 KB Output is correct
19 Correct 290 ms 17776 KB Output is correct
20 Correct 278 ms 17740 KB Output is correct
21 Correct 276 ms 17744 KB Output is correct
22 Correct 301 ms 19492 KB Output is correct
23 Correct 345 ms 22472 KB Output is correct
24 Correct 350 ms 22476 KB Output is correct
25 Correct 91 ms 12988 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 448 ms 18616 KB Output is correct
2 Correct 440 ms 18388 KB Output is correct
3 Correct 477 ms 18300 KB Output is correct
4 Correct 482 ms 23564 KB Output is correct
5 Correct 530 ms 18664 KB Output is correct
6 Correct 633 ms 23188 KB Output is correct
7 Correct 621 ms 23252 KB Output is correct
8 Correct 590 ms 23352 KB Output is correct
9 Correct 385 ms 22568 KB Output is correct
10 Correct 533 ms 22884 KB Output is correct
11 Correct 558 ms 22664 KB Output is correct
12 Correct 631 ms 22796 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 484 ms 18416 KB Output is correct
3 Correct 447 ms 18288 KB Output is correct
4 Correct 575 ms 18320 KB Output is correct
5 Correct 447 ms 18876 KB Output is correct
6 Correct 480 ms 19272 KB Output is correct
7 Correct 428 ms 19540 KB Output is correct
8 Correct 483 ms 23652 KB Output is correct
9 Correct 568 ms 23488 KB Output is correct
10 Correct 525 ms 18652 KB Output is correct
11 Correct 491 ms 20620 KB Output is correct
12 Correct 335 ms 18852 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 316 KB Output is correct
15 Correct 3 ms 468 KB Output is correct
16 Correct 2 ms 468 KB Output is correct
17 Correct 2 ms 468 KB Output is correct
18 Correct 2 ms 468 KB Output is correct
19 Correct 3 ms 468 KB Output is correct
20 Correct 3 ms 468 KB Output is correct
21 Correct 2 ms 452 KB Output is correct
22 Correct 1 ms 212 KB Output is correct
23 Correct 1 ms 212 KB Output is correct
24 Correct 4 ms 468 KB Output is correct
25 Correct 4 ms 448 KB Output is correct
26 Correct 2 ms 448 KB Output is correct
27 Correct 3 ms 456 KB Output is correct
28 Correct 3 ms 468 KB Output is correct
29 Correct 3 ms 468 KB Output is correct
30 Correct 2 ms 340 KB Output is correct
31 Correct 229 ms 1940 KB Output is correct
32 Correct 258 ms 1828 KB Output is correct
33 Correct 221 ms 2008 KB Output is correct
34 Correct 241 ms 2028 KB Output is correct
35 Correct 204 ms 2212 KB Output is correct
36 Correct 258 ms 2096 KB Output is correct
37 Correct 231 ms 1832 KB Output is correct
38 Correct 0 ms 212 KB Output is correct
39 Correct 1 ms 340 KB Output is correct
40 Correct 3 ms 468 KB Output is correct
41 Correct 3 ms 452 KB Output is correct
42 Correct 3 ms 468 KB Output is correct
43 Correct 3 ms 448 KB Output is correct
44 Correct 3 ms 468 KB Output is correct
45 Correct 8 ms 468 KB Output is correct
46 Correct 2 ms 340 KB Output is correct
47 Correct 290 ms 17776 KB Output is correct
48 Correct 278 ms 17740 KB Output is correct
49 Correct 276 ms 17744 KB Output is correct
50 Correct 301 ms 19492 KB Output is correct
51 Correct 345 ms 22472 KB Output is correct
52 Correct 350 ms 22476 KB Output is correct
53 Correct 91 ms 12988 KB Output is correct
54 Correct 448 ms 18616 KB Output is correct
55 Correct 440 ms 18388 KB Output is correct
56 Correct 477 ms 18300 KB Output is correct
57 Correct 482 ms 23564 KB Output is correct
58 Correct 530 ms 18664 KB Output is correct
59 Correct 633 ms 23188 KB Output is correct
60 Correct 621 ms 23252 KB Output is correct
61 Correct 590 ms 23352 KB Output is correct
62 Correct 385 ms 22568 KB Output is correct
63 Correct 533 ms 22884 KB Output is correct
64 Correct 558 ms 22664 KB Output is correct
65 Correct 631 ms 22796 KB Output is correct
66 Correct 1 ms 212 KB Output is correct
67 Correct 470 ms 18448 KB Output is correct
68 Correct 477 ms 18364 KB Output is correct
69 Correct 503 ms 18296 KB Output is correct
70 Correct 478 ms 18848 KB Output is correct
71 Correct 536 ms 19340 KB Output is correct
72 Correct 502 ms 19504 KB Output is correct
73 Correct 489 ms 23504 KB Output is correct
74 Correct 502 ms 23592 KB Output is correct
75 Correct 509 ms 18776 KB Output is correct
76 Correct 500 ms 20724 KB Output is correct
77 Correct 343 ms 18892 KB Output is correct
78 Correct 1 ms 212 KB Output is correct
79 Correct 2 ms 468 KB Output is correct
80 Correct 4 ms 468 KB Output is correct
81 Correct 2 ms 468 KB Output is correct
82 Correct 3 ms 488 KB Output is correct
83 Correct 4 ms 440 KB Output is correct
84 Correct 3 ms 452 KB Output is correct
85 Correct 2 ms 340 KB Output is correct
86 Correct 220 ms 1848 KB Output is correct
87 Correct 211 ms 1732 KB Output is correct
88 Correct 194 ms 2088 KB Output is correct
89 Correct 217 ms 2208 KB Output is correct
90 Correct 204 ms 2128 KB Output is correct
91 Correct 179 ms 2196 KB Output is correct
92 Correct 178 ms 1824 KB Output is correct
93 Correct 261 ms 17788 KB Output is correct
94 Correct 223 ms 17864 KB Output is correct
95 Correct 277 ms 17692 KB Output is correct
96 Correct 260 ms 19412 KB Output is correct
97 Correct 332 ms 22384 KB Output is correct
98 Correct 375 ms 22488 KB Output is correct
99 Correct 120 ms 12992 KB Output is correct
100 Correct 614 ms 23256 KB Output is correct
101 Correct 572 ms 23108 KB Output is correct
102 Correct 615 ms 23248 KB Output is correct
103 Correct 570 ms 22864 KB Output is correct
104 Correct 528 ms 22628 KB Output is correct
105 Correct 511 ms 22956 KB Output is correct
106 Correct 445 ms 17304 KB Output is correct
107 Correct 499 ms 18560 KB Output is correct
108 Correct 442 ms 18672 KB Output is correct
109 Correct 460 ms 18620 KB Output is correct
110 Correct 644 ms 23180 KB Output is correct
111 Correct 580 ms 23072 KB Output is correct