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Submission #1075904

# Submission time Handle Problem Language Result Execution time Memory
1075904 2024-08-26T09:42:33 Z hcng Event Hopping (BOI22_events) C++14
100 / 100
 45 ms 23136 KB 
#include <bits/stdc++.h>
using namespace std;

char *p1, *p2, buf[1<<20];
#define gc() (p1==p2&&(p2=(p1=buf)+fread(buf,1,1<<20,stdin),p1==p2)?EOF:*p1++)
inline int read() {int x=0;char c=gc();while(!isdigit(c))c=gc();while(isdigit(c))x=x*10+c-'0',c=gc();return x;}
#define pc(c) putchar(c)
void write(int x) {if(x>9)write(x/10);pc('0'+x%10);}

int n, q;
int mp[100010];
struct Int {
    int l, r, id;
} a[100010];
int ST[100010][20], fa[100010][20], lg2[100010];

inline int get(int x, int y) {
    return a[x].l <= a[y].l? x : y;
}

inline int query(int l, int r) {
    int d = r - l + 1;
    return get(ST[l][lg2[d]], ST[r - (1 << lg2[d]) + 1][lg2[d]]);
}

int main() {
    n = read(), q = read();
    for (int i = 1; i <= n; i++) {
        a[i].l = read(), a[i].r = read(), a[i].id = i;
    }
    sort(a + 1, a + 1 + n, [](Int &a, Int &b){return a.r < b.r || (a.r == b.r && a.l < b.l);});
    lg2[0] = -1;
    for (int i = 1; i <= n; i++) {
        mp[a[i].id] = i;
        ST[i][0] = i;
        lg2[i] = lg2[i - 1] + (i == (i & -i));
    }
    for (int i = 1; i < 20; i++) {
        for (int j = 1; j + (1 << i - 1) <= n; j++) {
            ST[j][i] = get(ST[j][i - 1], ST[j + (1 << i - 1)][i - 1]);
        }
    }
    for (int i = 1; i <= n; i++) {
        int L = 1, R = i;
        while (L < R) {
            int M = L + R >> 1;
            if (a[i].l <= a[M].r) R = M;
            else L = M + 1;
        }
        if (L != i) fa[i][0] = query(L, i - 1);
        else fa[i][0] = 0;
        // cerr << a[i].l << ' ' << a[i].r << ' ' << fa[i][0] << endl;
    }
    for (int i = 1; i < 20; i++) {
        for (int j = 1; j <= n; j++) {
            fa[j][i] = fa[fa[j][i - 1]][i - 1];
        }
    }
    a[0].l = -1;
    while (q--) {
        int s = read(), t = read();
        s = mp[s], t = mp[t];
        if (s == t) {
            puts("0");
            continue;
        }
        if (a[s].r > a[t].r) {
            puts("impossible");
            continue;
        }
        if (a[t].l <= a[s].r) {
            puts("1");
            continue;
        }
        int ans = 0;
        for (int i = 19; i >= 0; i--) {
            if (a[fa[t][i]].l > a[s].r) t = fa[t][i], ans += 1 << i;
        }
        t = fa[t][0];
        if (!t) {
            puts("impossible");
            continue;
        }
        write(ans + 2); pc('\n');
    }
    return 0;
}

Compilation message

events.cpp: In function 'int main()':
events.cpp:39:37: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   39 |         for (int j = 1; j + (1 << i - 1) <= n; j++) {
      |                                   ~~^~~
events.cpp:40:57: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   40 |             ST[j][i] = get(ST[j][i - 1], ST[j + (1 << i - 1)][i - 1]);
      |                                                       ~~^~~
events.cpp:46:23: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   46 |             int M = L + R >> 1;
      |                     ~~^~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 27 ms 22712 KB Output is correct
3 Correct 28 ms 22608 KB Output is correct
4 Correct 34 ms 22616 KB Output is correct
5 Correct 30 ms 22608 KB Output is correct
6 Correct 31 ms 22612 KB Output is correct
7 Correct 30 ms 22864 KB Output is correct
8 Correct 25 ms 23120 KB Output is correct
9 Correct 26 ms 23136 KB Output is correct
10 Correct 43 ms 23120 KB Output is correct
11 Correct 35 ms 23124 KB Output is correct
12 Correct 20 ms 22352 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6488 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6748 KB Output is correct
8 Correct 2 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6488 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6748 KB Output is correct
8 Correct 2 ms 6492 KB Output is correct
9 Correct 1 ms 6492 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 1 ms 6492 KB Output is correct
14 Correct 1 ms 6492 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 1 ms 6492 KB Output is correct
18 Correct 1 ms 6492 KB Output is correct
19 Correct 9 ms 11100 KB Output is correct
20 Correct 8 ms 11096 KB Output is correct
21 Correct 12 ms 11412 KB Output is correct
22 Correct 8 ms 11356 KB Output is correct
23 Correct 7 ms 11356 KB Output is correct
24 Correct 7 ms 11356 KB Output is correct
25 Correct 7 ms 10844 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6488 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6748 KB Output is correct
8 Correct 2 ms 6492 KB Output is correct
9 Correct 1 ms 6492 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 1 ms 6492 KB Output is correct
14 Correct 1 ms 6492 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 1 ms 6644 KB Output is correct
17 Correct 1 ms 6492 KB Output is correct
18 Correct 1 ms 6492 KB Output is correct
19 Correct 20 ms 20828 KB Output is correct
20 Correct 19 ms 20224 KB Output is correct
21 Correct 24 ms 20852 KB Output is correct
22 Correct 20 ms 21028 KB Output is correct
23 Correct 23 ms 20744 KB Output is correct
24 Correct 21 ms 20824 KB Output is correct
25 Correct 14 ms 20316 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 27 ms 22644 KB Output is correct
2 Correct 33 ms 22652 KB Output is correct
3 Correct 34 ms 22612 KB Output is correct
4 Correct 28 ms 23092 KB Output is correct
5 Correct 41 ms 23124 KB Output is correct
6 Correct 38 ms 22864 KB Output is correct
7 Correct 43 ms 22728 KB Output is correct
8 Correct 35 ms 22872 KB Output is correct
9 Correct 20 ms 20816 KB Output is correct
10 Correct 26 ms 22356 KB Output is correct
11 Correct 28 ms 22096 KB Output is correct
12 Correct 28 ms 22356 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 27 ms 22712 KB Output is correct
3 Correct 28 ms 22608 KB Output is correct
4 Correct 34 ms 22616 KB Output is correct
5 Correct 30 ms 22608 KB Output is correct
6 Correct 31 ms 22612 KB Output is correct
7 Correct 30 ms 22864 KB Output is correct
8 Correct 25 ms 23120 KB Output is correct
9 Correct 26 ms 23136 KB Output is correct
10 Correct 43 ms 23120 KB Output is correct
11 Correct 35 ms 23124 KB Output is correct
12 Correct 20 ms 22352 KB Output is correct
13 Correct 1 ms 6492 KB Output is correct
14 Correct 1 ms 6488 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 1 ms 6492 KB Output is correct
18 Correct 1 ms 6492 KB Output is correct
19 Correct 1 ms 6748 KB Output is correct
20 Correct 2 ms 6492 KB Output is correct
21 Correct 1 ms 6492 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 1 ms 6492 KB Output is correct
26 Correct 1 ms 6492 KB Output is correct
27 Correct 1 ms 6492 KB Output is correct
28 Correct 1 ms 6492 KB Output is correct
29 Correct 1 ms 6492 KB Output is correct
30 Correct 1 ms 6492 KB Output is correct
31 Correct 9 ms 11100 KB Output is correct
32 Correct 8 ms 11096 KB Output is correct
33 Correct 12 ms 11412 KB Output is correct
34 Correct 8 ms 11356 KB Output is correct
35 Correct 7 ms 11356 KB Output is correct
36 Correct 7 ms 11356 KB Output is correct
37 Correct 7 ms 10844 KB Output is correct
38 Correct 1 ms 6492 KB Output is correct
39 Correct 1 ms 6492 KB Output is correct
40 Correct 1 ms 6492 KB Output is correct
41 Correct 1 ms 6492 KB Output is correct
42 Correct 1 ms 6492 KB Output is correct
43 Correct 1 ms 6492 KB Output is correct
44 Correct 1 ms 6644 KB Output is correct
45 Correct 1 ms 6492 KB Output is correct
46 Correct 1 ms 6492 KB Output is correct
47 Correct 20 ms 20828 KB Output is correct
48 Correct 19 ms 20224 KB Output is correct
49 Correct 24 ms 20852 KB Output is correct
50 Correct 20 ms 21028 KB Output is correct
51 Correct 23 ms 20744 KB Output is correct
52 Correct 21 ms 20824 KB Output is correct
53 Correct 14 ms 20316 KB Output is correct
54 Correct 27 ms 22644 KB Output is correct
55 Correct 33 ms 22652 KB Output is correct
56 Correct 34 ms 22612 KB Output is correct
57 Correct 28 ms 23092 KB Output is correct
58 Correct 41 ms 23124 KB Output is correct
59 Correct 38 ms 22864 KB Output is correct
60 Correct 43 ms 22728 KB Output is correct
61 Correct 35 ms 22872 KB Output is correct
62 Correct 20 ms 20816 KB Output is correct
63 Correct 26 ms 22356 KB Output is correct
64 Correct 28 ms 22096 KB Output is correct
65 Correct 28 ms 22356 KB Output is correct
66 Correct 1 ms 6588 KB Output is correct
67 Correct 27 ms 22620 KB Output is correct
68 Correct 29 ms 22548 KB Output is correct
69 Correct 33 ms 22580 KB Output is correct
70 Correct 31 ms 22608 KB Output is correct
71 Correct 31 ms 22612 KB Output is correct
72 Correct 31 ms 22868 KB Output is correct
73 Correct 27 ms 23120 KB Output is correct
74 Correct 27 ms 23120 KB Output is correct
75 Correct 42 ms 23120 KB Output is correct
76 Correct 39 ms 23088 KB Output is correct
77 Correct 19 ms 22360 KB Output is correct
78 Correct 1 ms 6492 KB Output is correct
79 Correct 1 ms 6492 KB Output is correct
80 Correct 1 ms 6492 KB Output is correct
81 Correct 1 ms 6492 KB Output is correct
82 Correct 1 ms 6492 KB Output is correct
83 Correct 1 ms 6492 KB Output is correct
84 Correct 1 ms 6556 KB Output is correct
85 Correct 1 ms 6492 KB Output is correct
86 Correct 9 ms 11096 KB Output is correct
87 Correct 8 ms 11100 KB Output is correct
88 Correct 14 ms 11356 KB Output is correct
89 Correct 8 ms 11356 KB Output is correct
90 Correct 8 ms 11356 KB Output is correct
91 Correct 7 ms 11356 KB Output is correct
92 Correct 6 ms 10844 KB Output is correct
93 Correct 20 ms 20824 KB Output is correct
94 Correct 20 ms 20060 KB Output is correct
95 Correct 24 ms 20924 KB Output is correct
96 Correct 23 ms 20820 KB Output is correct
97 Correct 20 ms 20828 KB Output is correct
98 Correct 21 ms 20828 KB Output is correct
99 Correct 14 ms 20316 KB Output is correct
100 Correct 44 ms 22900 KB Output is correct
101 Correct 37 ms 22864 KB Output is correct
102 Correct 34 ms 22868 KB Output is correct
103 Correct 27 ms 22356 KB Output is correct
104 Correct 26 ms 22100 KB Output is correct
105 Correct 26 ms 22356 KB Output is correct
106 Correct 37 ms 22100 KB Output is correct
107 Correct 45 ms 22100 KB Output is correct
108 Correct 34 ms 22716 KB Output is correct
109 Correct 33 ms 22868 KB Output is correct
110 Correct 36 ms 22608 KB Output is correct
111 Correct 38 ms 22608 KB Output is correct