oj.uz

Submission #1100998

# Submission time Handle Problem Language Result Execution time Memory
1100998 2024-10-15T08:20:54 Z andrei_iorgulescu Event Hopping (BOI22_events) C++14
100 / 100
 210 ms 54736 KB 
#include <bits/stdc++.h>

using namespace std;

int n, q;
int s[100005], e[100005];
int minl[200005];
int f[200005];

void normalize()
{
    vector<int> pp;
    map<int, int> norma;
    for (int i = 1; i <= n; i++)
        pp.push_back(s[i]), pp.push_back(e[i]);
    sort(pp.begin(), pp.end());
    int poo = 0;
    for (auto it : pp)
        if (!norma[it])
            norma[it] = ++poo;
    for (int i = 1; i <= n; i++)
        s[i] = norma[s[i]], e[i] = norma[e[i]];
    for (int i = 1; i <= 2 * n; i++)
        minl[i] = i;
    for (int i = 1; i <= n; i++)
        minl[e[i]] = min(minl[e[i]], s[i]);
}

pair<int, int> aint[800005];///val, pos

void build(int nod, int l, int r)
{
    if (l == r)
    {
        aint[nod] = {minl[l], l};
        return;
    }
    int mij = (l + r) / 2;
    build(2 * nod, l, mij);
    build(2 * nod + 1, mij + 1, r);
    aint[nod] = min(aint[2 * nod], aint[2 * nod + 1]);
}

pair<int, int> query(int nod, int l, int r, int st, int dr)
{
    if (r < st or dr < l)
        return {1e9, 0};
    else if (st <= l and r <= dr)
        return aint[nod];
    int mij = (l + r) / 2;
    return min(query(2 * nod, l, mij, st, dr), query(2 * nod + 1, mij + 1, r, st, dr));
}

int lg[200005];
int bl[20][200005], bl1[20][200005];

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    cin >> n >> q;
    for (int i = 1; i <= n; i++)
        cin >> s[i] >> e[i];
    normalize();
    build(1, 1, 2 * n);
    for (int i = 1; i <= 2 * n; i++)
        f[i] = query(1, 1, 2 * n, minl[i], i).second;
    for (int i = 2; i <= 2 * n; i++)
        lg[i] = 1 + lg[i / 2];
    for (int i = 1; i <= 2 * n; i++)
        bl[0][i] = f[i];
    for (int j = 1; j <= lg[2 * n]; j++)
        for (int i = 1; i <= 2 * n; i++)
            bl[j][i] = bl[j - 1][bl[j - 1][i]];
    for (int i = 1; i <= 2 * n; i++)
        bl1[0][i] = i;
    for (int j = 1; j <= lg[2 * n]; j++)
        for (int i = 1; i <= 2 * n; i++)
            bl1[j][i] = bl[j - 1][bl1[j - 1][i]];
    for (int i = 1; i <= q; i++)
    {
        int x, y;
        cin >> x >> y;
        int xx = x, yy = y;
        if (x == y)
        {
            cout << "0\n";
            continue;
        }
        x = e[x], y = e[y];
        swap(x, y);
        if (x < y)
            cout << "impossible\n";
        else if (s[yy] <= e[xx])
            cout << "1\n";
        else
        {
            int xs = x, ys = y;
            int ans = 1;
            for (int pas = lg[2 * n]; pas >= 0; pas--)
            {
                if (minl[bl1[pas][x]] > y)
                    ans += (1 << pas), x = bl[pas][x];
            }
            if (minl[x] > y)
                cout << "impossible\n";
            else
            {
                if (s[yy] == minl[xs])
                    cout << ans << '\n';
                else
                {
                    ///maybe ans + 1?
                    x = query(1, 1, 2 * n, s[yy], xs - 1).second;
                    int ans2 = ans;
                    ans = 2;
                    for (int pas = lg[2 * n]; pas >= 0; pas--)
                    {
                        if (minl[bl1[pas][x]] > y)
                            ans += (1 << pas), x = bl[pas][x];
                    }
                    if (minl[x] > y)
                        cout << ans2 + 1 << '\n';
                    else
                        cout << min(ans2 + 1, ans) << '\n';
                }
            }
        }
    }
    return 0;
}

Compilation message

events.cpp: In function 'int main()':
events.cpp:99:25: warning: unused variable 'ys' [-Wunused-variable]
   99 |             int xs = x, ys = y;
      |                         ^~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 14672 KB Output is correct
2 Correct 139 ms 46384 KB Output is correct
3 Correct 171 ms 46428 KB Output is correct
4 Correct 149 ms 46256 KB Output is correct
5 Correct 140 ms 46768 KB Output is correct
6 Correct 159 ms 47280 KB Output is correct
7 Correct 163 ms 47536 KB Output is correct
8 Correct 180 ms 51552 KB Output is correct
9 Correct 181 ms 51444 KB Output is correct
10 Correct 170 ms 46688 KB Output is correct
11 Correct 171 ms 48560 KB Output is correct
12 Correct 111 ms 49144 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 12624 KB Output is correct
2 Correct 2 ms 14672 KB Output is correct
3 Correct 3 ms 23120 KB Output is correct
4 Correct 4 ms 23120 KB Output is correct
5 Correct 4 ms 23288 KB Output is correct
6 Correct 5 ms 23120 KB Output is correct
7 Correct 3 ms 23124 KB Output is correct
8 Correct 4 ms 23124 KB Output is correct
9 Correct 3 ms 23032 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 12624 KB Output is correct
2 Correct 2 ms 14672 KB Output is correct
3 Correct 3 ms 23120 KB Output is correct
4 Correct 4 ms 23120 KB Output is correct
5 Correct 4 ms 23288 KB Output is correct
6 Correct 5 ms 23120 KB Output is correct
7 Correct 3 ms 23124 KB Output is correct
8 Correct 4 ms 23124 KB Output is correct
9 Correct 3 ms 23032 KB Output is correct
10 Correct 2 ms 12764 KB Output is correct
11 Correct 2 ms 14768 KB Output is correct
12 Correct 3 ms 23124 KB Output is correct
13 Correct 4 ms 23124 KB Output is correct
14 Correct 4 ms 23124 KB Output is correct
15 Correct 4 ms 23124 KB Output is correct
16 Correct 4 ms 23124 KB Output is correct
17 Correct 4 ms 23124 KB Output is correct
18 Correct 3 ms 22868 KB Output is correct
19 Correct 27 ms 28996 KB Output is correct
20 Correct 24 ms 29012 KB Output is correct
21 Correct 28 ms 29260 KB Output is correct
22 Correct 25 ms 29280 KB Output is correct
23 Correct 21 ms 29372 KB Output is correct
24 Correct 20 ms 29280 KB Output is correct
25 Correct 24 ms 29004 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 12624 KB Output is correct
2 Correct 2 ms 14672 KB Output is correct
3 Correct 3 ms 23120 KB Output is correct
4 Correct 4 ms 23120 KB Output is correct
5 Correct 4 ms 23288 KB Output is correct
6 Correct 5 ms 23120 KB Output is correct
7 Correct 3 ms 23124 KB Output is correct
8 Correct 4 ms 23124 KB Output is correct
9 Correct 3 ms 23032 KB Output is correct
10 Correct 2 ms 12764 KB Output is correct
11 Correct 2 ms 14676 KB Output is correct
12 Correct 4 ms 23124 KB Output is correct
13 Correct 4 ms 23124 KB Output is correct
14 Correct 4 ms 23124 KB Output is correct
15 Correct 5 ms 23124 KB Output is correct
16 Correct 4 ms 23124 KB Output is correct
17 Correct 4 ms 23288 KB Output is correct
18 Correct 3 ms 22868 KB Output is correct
19 Correct 126 ms 47660 KB Output is correct
20 Correct 120 ms 46772 KB Output is correct
21 Correct 125 ms 47540 KB Output is correct
22 Correct 132 ms 49340 KB Output is correct
23 Correct 161 ms 52284 KB Output is correct
24 Correct 161 ms 52404 KB Output is correct
25 Correct 48 ms 42344 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 134 ms 46264 KB Output is correct
2 Correct 137 ms 46436 KB Output is correct
3 Correct 144 ms 46256 KB Output is correct
4 Correct 160 ms 51560 KB Output is correct
5 Correct 145 ms 46768 KB Output is correct
6 Correct 206 ms 51120 KB Output is correct
7 Correct 199 ms 51040 KB Output is correct
8 Correct 205 ms 51380 KB Output is correct
9 Correct 173 ms 50348 KB Output is correct
10 Correct 210 ms 50720 KB Output is correct
11 Correct 205 ms 50608 KB Output is correct
12 Correct 189 ms 50872 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 14672 KB Output is correct
2 Correct 139 ms 46384 KB Output is correct
3 Correct 171 ms 46428 KB Output is correct
4 Correct 149 ms 46256 KB Output is correct
5 Correct 140 ms 46768 KB Output is correct
6 Correct 159 ms 47280 KB Output is correct
7 Correct 163 ms 47536 KB Output is correct
8 Correct 180 ms 51552 KB Output is correct
9 Correct 181 ms 51444 KB Output is correct
10 Correct 170 ms 46688 KB Output is correct
11 Correct 171 ms 48560 KB Output is correct
12 Correct 111 ms 49144 KB Output is correct
13 Correct 2 ms 12624 KB Output is correct
14 Correct 2 ms 14672 KB Output is correct
15 Correct 3 ms 23120 KB Output is correct
16 Correct 4 ms 23120 KB Output is correct
17 Correct 4 ms 23288 KB Output is correct
18 Correct 5 ms 23120 KB Output is correct
19 Correct 3 ms 23124 KB Output is correct
20 Correct 4 ms 23124 KB Output is correct
21 Correct 3 ms 23032 KB Output is correct
22 Correct 2 ms 12764 KB Output is correct
23 Correct 2 ms 14768 KB Output is correct
24 Correct 3 ms 23124 KB Output is correct
25 Correct 4 ms 23124 KB Output is correct
26 Correct 4 ms 23124 KB Output is correct
27 Correct 4 ms 23124 KB Output is correct
28 Correct 4 ms 23124 KB Output is correct
29 Correct 4 ms 23124 KB Output is correct
30 Correct 3 ms 22868 KB Output is correct
31 Correct 27 ms 28996 KB Output is correct
32 Correct 24 ms 29012 KB Output is correct
33 Correct 28 ms 29260 KB Output is correct
34 Correct 25 ms 29280 KB Output is correct
35 Correct 21 ms 29372 KB Output is correct
36 Correct 20 ms 29280 KB Output is correct
37 Correct 24 ms 29004 KB Output is correct
38 Correct 2 ms 12764 KB Output is correct
39 Correct 2 ms 14676 KB Output is correct
40 Correct 4 ms 23124 KB Output is correct
41 Correct 4 ms 23124 KB Output is correct
42 Correct 4 ms 23124 KB Output is correct
43 Correct 5 ms 23124 KB Output is correct
44 Correct 4 ms 23124 KB Output is correct
45 Correct 4 ms 23288 KB Output is correct
46 Correct 3 ms 22868 KB Output is correct
47 Correct 126 ms 47660 KB Output is correct
48 Correct 120 ms 46772 KB Output is correct
49 Correct 125 ms 47540 KB Output is correct
50 Correct 132 ms 49340 KB Output is correct
51 Correct 161 ms 52284 KB Output is correct
52 Correct 161 ms 52404 KB Output is correct
53 Correct 48 ms 42344 KB Output is correct
54 Correct 134 ms 46264 KB Output is correct
55 Correct 137 ms 46436 KB Output is correct
56 Correct 144 ms 46256 KB Output is correct
57 Correct 160 ms 51560 KB Output is correct
58 Correct 145 ms 46768 KB Output is correct
59 Correct 206 ms 51120 KB Output is correct
60 Correct 199 ms 51040 KB Output is correct
61 Correct 205 ms 51380 KB Output is correct
62 Correct 173 ms 50348 KB Output is correct
63 Correct 210 ms 50720 KB Output is correct
64 Correct 205 ms 50608 KB Output is correct
65 Correct 189 ms 50872 KB Output is correct
66 Correct 2 ms 14812 KB Output is correct
67 Correct 145 ms 49472 KB Output is correct
68 Correct 141 ms 49348 KB Output is correct
69 Correct 156 ms 49332 KB Output is correct
70 Correct 151 ms 49844 KB Output is correct
71 Correct 157 ms 50540 KB Output is correct
72 Correct 149 ms 50624 KB Output is correct
73 Correct 178 ms 54736 KB Output is correct
74 Correct 166 ms 54708 KB Output is correct
75 Correct 159 ms 49732 KB Output is correct
76 Correct 186 ms 51640 KB Output is correct
77 Correct 108 ms 49236 KB Output is correct
78 Correct 2 ms 12792 KB Output is correct
79 Correct 4 ms 23036 KB Output is correct
80 Correct 4 ms 23124 KB Output is correct
81 Correct 3 ms 23140 KB Output is correct
82 Correct 4 ms 23124 KB Output is correct
83 Correct 4 ms 23288 KB Output is correct
84 Correct 5 ms 23008 KB Output is correct
85 Correct 3 ms 22868 KB Output is correct
86 Correct 29 ms 29012 KB Output is correct
87 Correct 26 ms 29004 KB Output is correct
88 Correct 32 ms 29260 KB Output is correct
89 Correct 27 ms 29436 KB Output is correct
90 Correct 25 ms 29268 KB Output is correct
91 Correct 22 ms 29268 KB Output is correct
92 Correct 23 ms 29096 KB Output is correct
93 Correct 123 ms 47620 KB Output is correct
94 Correct 123 ms 46772 KB Output is correct
95 Correct 131 ms 47540 KB Output is correct
96 Correct 136 ms 49336 KB Output is correct
97 Correct 165 ms 52408 KB Output is correct
98 Correct 163 ms 52420 KB Output is correct
99 Correct 49 ms 42372 KB Output is correct
100 Correct 189 ms 54332 KB Output is correct
101 Correct 197 ms 54228 KB Output is correct
102 Correct 183 ms 54492 KB Output is correct
103 Correct 180 ms 53940 KB Output is correct
104 Correct 200 ms 53792 KB Output is correct
105 Correct 187 ms 53944 KB Output is correct
106 Correct 140 ms 47740 KB Output is correct
107 Correct 154 ms 48820 KB Output is correct
108 Correct 149 ms 49600 KB Output is correct
109 Correct 153 ms 49588 KB Output is correct
110 Correct 192 ms 54196 KB Output is correct
111 Correct 195 ms 54136 KB Output is correct