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Submission #637753

# Submission time Handle Problem Language Result Execution time Memory
637753 2022-09-03T06:47:58 Z LeonaRaging Event Hopping (BOI22_events) C++14
100 / 100
 204 ms 24800 KB 
#include <bits/stdc++.h>
using namespace std;

#define fi first
#define se second
#define ll long long
#define pb push_back
#define db(val) "[" #val " = " << (val) << "] "

const ll mod = 1e9 + 7;
const int maxn = 2e5 + 4;
const int INF = 1e9;
const int N = 18;

pair<int,int> a[maxn];

struct seg_tree {
    vector<int> t;
    seg_tree() {
        t.resize(4 * maxn);
    }
    int MIN(int i, int j) {
        return (a[i].fi < a[j].fi ? i : j);
    }
    void update(int pos, int val, int v = 1, int l = 1, int r = maxn - 1) {
        if (l == r) {
            t[v] = MIN(t[v], val);
            return;
        }
        int m = (l + r) / 2;
        if (pos <= m) update(pos, val, 2 * v, l, m);
        else update(pos, val, 2 * v + 1, m + 1, r);
        t[v] = MIN(t[2 * v], t[2 * v + 1]);
    }
    int get(int l, int r, int v = 1, int tl = 1, int tr = maxn - 1) {
        if (tl > r || tr < l) return 0;
        if (tl >= l && tr <= r) return t[v];
        int m = (tl + tr) / 2;
        int L = get(l, r, 2 * v, tl, m);
        int R = get(l, r, 2 * v + 1, m + 1, tr);
        return MIN(L, R);
    }
} IT;

int n, q, pre[maxn][20];
vector<int> vals;
vector<pair<int,int>> R[maxn];

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    //freopen(".INP", "r", stdin);
    //freopen(".OUT", "w", stdout);
    cin >> n >> q;
    for (int i = 1; i <= n; i++) {
        int l, r; cin >> l >> r;
        a[i] = {l, r};
        vals.pb(l); vals.pb(r);        
    }
    sort(vals.begin(), vals.end());
    vals.erase(unique(vals.begin(), vals.end()), vals.end());
    a[0] = {INF, INF};
    for (int i = 1; i <= n; i++) {
        a[i].fi = lower_bound(vals.begin(), vals.end(), a[i].fi) - vals.begin() + 1;
        a[i].se = lower_bound(vals.begin(), vals.end(), a[i].se) - vals.begin() + 1;
        R[a[i].se].pb({a[i].fi, i});
    }
    int sz = vals.size();
    for (int i = 1; i <= sz; i++) {
        sort(R[i].begin(), R[i].end());
        for (auto it : R[i]) {
            pre[it.se][0] = IT.get(it.fi, i);
            IT.update(i, it.se);
        }
    }
    for (int j = 1; j <= N; j++)
        for (int i = n; i >= 1; i--)
            pre[i][j] = pre[pre[i][j - 1]][j - 1];
    a[0] = {-INF, -INF};
    while (q--) {
        int s, t; cin >> s >> t;
        if (s == t) {
            cout << "0\n";
            continue;
        }
        int ans = 0;
        for (int j = N; j >= 0; j--)
            if (a[pre[t][j]].fi > a[s].se && pre[t][j] != s) {
                ans += (1 << j);
                t = pre[t][j];
            }
        if (a[t].se < a[s].se) ans = -1;
        else if (a[t].fi > a[s].se) {
            if (!pre[t][0]) ans = -1;
            else ans++;
        }
        if (ans == -1) cout << "impossible";
        else cout << ans + 1;
        cout << '\n';
    }
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 8148 KB Output is correct
2 Correct 149 ms 21304 KB Output is correct
3 Correct 140 ms 21180 KB Output is correct
4 Correct 170 ms 21260 KB Output is correct
5 Correct 151 ms 22152 KB Output is correct
6 Correct 179 ms 24228 KB Output is correct
7 Correct 153 ms 24344 KB Output is correct
8 Correct 162 ms 24652 KB Output is correct
9 Correct 148 ms 24800 KB Output is correct
10 Correct 172 ms 24648 KB Output is correct
11 Correct 163 ms 24688 KB Output is correct
12 Correct 98 ms 22512 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 8088 KB Output is correct
2 Correct 4 ms 8148 KB Output is correct
3 Correct 6 ms 8236 KB Output is correct
4 Correct 6 ms 8276 KB Output is correct
5 Correct 6 ms 8308 KB Output is correct
6 Correct 4 ms 8276 KB Output is correct
7 Correct 4 ms 8232 KB Output is correct
8 Correct 5 ms 8276 KB Output is correct
9 Correct 4 ms 8276 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 8088 KB Output is correct
2 Correct 4 ms 8148 KB Output is correct
3 Correct 6 ms 8236 KB Output is correct
4 Correct 6 ms 8276 KB Output is correct
5 Correct 6 ms 8308 KB Output is correct
6 Correct 4 ms 8276 KB Output is correct
7 Correct 4 ms 8232 KB Output is correct
8 Correct 5 ms 8276 KB Output is correct
9 Correct 4 ms 8276 KB Output is correct
10 Correct 5 ms 8172 KB Output is correct
11 Correct 4 ms 8148 KB Output is correct
12 Correct 6 ms 8276 KB Output is correct
13 Correct 6 ms 8276 KB Output is correct
14 Correct 4 ms 8220 KB Output is correct
15 Correct 5 ms 8260 KB Output is correct
16 Correct 5 ms 8224 KB Output is correct
17 Correct 5 ms 8228 KB Output is correct
18 Correct 4 ms 8276 KB Output is correct
19 Correct 38 ms 9208 KB Output is correct
20 Correct 32 ms 9288 KB Output is correct
21 Correct 36 ms 9532 KB Output is correct
22 Correct 33 ms 9436 KB Output is correct
23 Correct 40 ms 9400 KB Output is correct
24 Correct 32 ms 9428 KB Output is correct
25 Correct 33 ms 9112 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 8088 KB Output is correct
2 Correct 4 ms 8148 KB Output is correct
3 Correct 6 ms 8236 KB Output is correct
4 Correct 6 ms 8276 KB Output is correct
5 Correct 6 ms 8308 KB Output is correct
6 Correct 4 ms 8276 KB Output is correct
7 Correct 4 ms 8232 KB Output is correct
8 Correct 5 ms 8276 KB Output is correct
9 Correct 4 ms 8276 KB Output is correct
10 Correct 3 ms 8148 KB Output is correct
11 Correct 4 ms 8148 KB Output is correct
12 Correct 5 ms 8276 KB Output is correct
13 Correct 6 ms 8276 KB Output is correct
14 Correct 6 ms 8276 KB Output is correct
15 Correct 5 ms 8276 KB Output is correct
16 Correct 4 ms 8276 KB Output is correct
17 Correct 4 ms 8276 KB Output is correct
18 Correct 4 ms 8276 KB Output is correct
19 Correct 106 ms 20676 KB Output is correct
20 Correct 103 ms 20608 KB Output is correct
21 Correct 119 ms 19284 KB Output is correct
22 Correct 111 ms 22572 KB Output is correct
23 Correct 121 ms 22708 KB Output is correct
24 Correct 126 ms 22576 KB Output is correct
25 Correct 50 ms 19676 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 130 ms 21276 KB Output is correct
2 Correct 141 ms 21248 KB Output is correct
3 Correct 166 ms 21228 KB Output is correct
4 Correct 144 ms 22588 KB Output is correct
5 Correct 158 ms 24516 KB Output is correct
6 Correct 166 ms 24288 KB Output is correct
7 Correct 204 ms 24256 KB Output is correct
8 Correct 156 ms 24392 KB Output is correct
9 Correct 125 ms 22540 KB Output is correct
10 Correct 200 ms 24000 KB Output is correct
11 Correct 178 ms 23736 KB Output is correct
12 Correct 164 ms 24004 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 8148 KB Output is correct
2 Correct 149 ms 21304 KB Output is correct
3 Correct 140 ms 21180 KB Output is correct
4 Correct 170 ms 21260 KB Output is correct
5 Correct 151 ms 22152 KB Output is correct
6 Correct 179 ms 24228 KB Output is correct
7 Correct 153 ms 24344 KB Output is correct
8 Correct 162 ms 24652 KB Output is correct
9 Correct 148 ms 24800 KB Output is correct
10 Correct 172 ms 24648 KB Output is correct
11 Correct 163 ms 24688 KB Output is correct
12 Correct 98 ms 22512 KB Output is correct
13 Correct 5 ms 8088 KB Output is correct
14 Correct 4 ms 8148 KB Output is correct
15 Correct 6 ms 8236 KB Output is correct
16 Correct 6 ms 8276 KB Output is correct
17 Correct 6 ms 8308 KB Output is correct
18 Correct 4 ms 8276 KB Output is correct
19 Correct 4 ms 8232 KB Output is correct
20 Correct 5 ms 8276 KB Output is correct
21 Correct 4 ms 8276 KB Output is correct
22 Correct 5 ms 8172 KB Output is correct
23 Correct 4 ms 8148 KB Output is correct
24 Correct 6 ms 8276 KB Output is correct
25 Correct 6 ms 8276 KB Output is correct
26 Correct 4 ms 8220 KB Output is correct
27 Correct 5 ms 8260 KB Output is correct
28 Correct 5 ms 8224 KB Output is correct
29 Correct 5 ms 8228 KB Output is correct
30 Correct 4 ms 8276 KB Output is correct
31 Correct 38 ms 9208 KB Output is correct
32 Correct 32 ms 9288 KB Output is correct
33 Correct 36 ms 9532 KB Output is correct
34 Correct 33 ms 9436 KB Output is correct
35 Correct 40 ms 9400 KB Output is correct
36 Correct 32 ms 9428 KB Output is correct
37 Correct 33 ms 9112 KB Output is correct
38 Correct 3 ms 8148 KB Output is correct
39 Correct 4 ms 8148 KB Output is correct
40 Correct 5 ms 8276 KB Output is correct
41 Correct 6 ms 8276 KB Output is correct
42 Correct 6 ms 8276 KB Output is correct
43 Correct 5 ms 8276 KB Output is correct
44 Correct 4 ms 8276 KB Output is correct
45 Correct 4 ms 8276 KB Output is correct
46 Correct 4 ms 8276 KB Output is correct
47 Correct 106 ms 20676 KB Output is correct
48 Correct 103 ms 20608 KB Output is correct
49 Correct 119 ms 19284 KB Output is correct
50 Correct 111 ms 22572 KB Output is correct
51 Correct 121 ms 22708 KB Output is correct
52 Correct 126 ms 22576 KB Output is correct
53 Correct 50 ms 19676 KB Output is correct
54 Correct 130 ms 21276 KB Output is correct
55 Correct 141 ms 21248 KB Output is correct
56 Correct 166 ms 21228 KB Output is correct
57 Correct 144 ms 22588 KB Output is correct
58 Correct 158 ms 24516 KB Output is correct
59 Correct 166 ms 24288 KB Output is correct
60 Correct 204 ms 24256 KB Output is correct
61 Correct 156 ms 24392 KB Output is correct
62 Correct 125 ms 22540 KB Output is correct
63 Correct 200 ms 24000 KB Output is correct
64 Correct 178 ms 23736 KB Output is correct
65 Correct 164 ms 24004 KB Output is correct
66 Correct 4 ms 8148 KB Output is correct
67 Correct 147 ms 24392 KB Output is correct
68 Correct 177 ms 24308 KB Output is correct
69 Correct 174 ms 24260 KB Output is correct
70 Correct 149 ms 24476 KB Output is correct
71 Correct 167 ms 24428 KB Output is correct
72 Correct 149 ms 24540 KB Output is correct
73 Correct 134 ms 24776 KB Output is correct
74 Correct 164 ms 24768 KB Output is correct
75 Correct 168 ms 24648 KB Output is correct
76 Correct 150 ms 24752 KB Output is correct
77 Correct 115 ms 22504 KB Output is correct
78 Correct 4 ms 8072 KB Output is correct
79 Correct 5 ms 8276 KB Output is correct
80 Correct 5 ms 8324 KB Output is correct
81 Correct 5 ms 8192 KB Output is correct
82 Correct 5 ms 8276 KB Output is correct
83 Correct 4 ms 8276 KB Output is correct
84 Correct 4 ms 8276 KB Output is correct
85 Correct 5 ms 8276 KB Output is correct
86 Correct 35 ms 10276 KB Output is correct
87 Correct 45 ms 10328 KB Output is correct
88 Correct 38 ms 10444 KB Output is correct
89 Correct 32 ms 10572 KB Output is correct
90 Correct 35 ms 10376 KB Output is correct
91 Correct 37 ms 10432 KB Output is correct
92 Correct 33 ms 10024 KB Output is correct
93 Correct 111 ms 22576 KB Output is correct
94 Correct 112 ms 21776 KB Output is correct
95 Correct 124 ms 21160 KB Output is correct
96 Correct 120 ms 22628 KB Output is correct
97 Correct 133 ms 22516 KB Output is correct
98 Correct 145 ms 22548 KB Output is correct
99 Correct 53 ms 19660 KB Output is correct
100 Correct 177 ms 24624 KB Output is correct
101 Correct 192 ms 24560 KB Output is correct
102 Correct 170 ms 24608 KB Output is correct
103 Correct 190 ms 24264 KB Output is correct
104 Correct 166 ms 23872 KB Output is correct
105 Correct 150 ms 24136 KB Output is correct
106 Correct 156 ms 23236 KB Output is correct
107 Correct 170 ms 23752 KB Output is correct
108 Correct 145 ms 23088 KB Output is correct
109 Correct 159 ms 23140 KB Output is correct
110 Correct 172 ms 24388 KB Output is correct
111 Correct 173 ms 24340 KB Output is correct