oj.uz

Submission #624096

# Submission time Handle Problem Language Result Execution time Memory
624096 2022-08-07T08:57:19 Z ddy888 Event Hopping (BOI22_events) C++17
100 / 100
 257 ms 84484 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#pragma GCC optimize("unroll-loops")
using namespace std;
using namespace __gnu_pbds;

using ll = long long;
#define pb push_back
#define fi first
#define si second
#define ar array
typedef pair<int,int> pi;
typedef tuple<int,int,int> ti;  
template<typename T> bool chmin(T &a, T b){return (b < a) ? a = b, 1 : 0;}
template<typename T> bool chmax(T &a, T b){return (b > a) ? a = b, 1 : 0;}
template<class key, class value = null_type, class cmp = less<key> >
using ordered_set = tree<key, value, cmp, rb_tree_tag, tree_order_statistics_node_update>;
mt19937 rng(chrono::system_clock::now().time_since_epoch().count());

void debug_out() {cerr<<endl;}
template <typename Head, typename... Tail>
void debug_out(Head _H, Tail... _T) {cerr<<" "<<to_string(_H);debug_out(_T...);}
#define debug(...) cerr<<"["<<#__VA_ARGS__<<"]:",debug_out(__VA_ARGS__)
const int INF = 1e9, MAXN = 100010;

int n, q;
vector<ti> events; // end, start, index
int st[20][MAXN], order[MAXN];
pi old[MAXN];

struct node { // thanks rs
    int s,e,m;
    pi v;
    node *l,*r;
    node(int S,int E){
        s=S,e=E,m=(s+e)>>1;
        v=pi(INF,0);
        l=r=0;
    }
    void update(int x,pi nval) {
        if(s==e) {
            v = min(v, nval);
            return;
        }
        if(x>m) cr(), r->update(x,nval);
        else cl(), l->update(x,nval);
        v=min(l?l->v:pi(INF,0),r?r->v:pi(INF,0));
    }
    pi rmq(int x,int y) {
        if(s==x&&e==y) return v;
        if(x>m)return r?r->rmq(x,y):pi(INF,0);
        else if(y<=m)return l?l->rmq(x,y):pi(INF,0);
        else return min(l?l->rmq(x,m):pi(INF,0),r?r->rmq(m+1,y):pi(INF,0));
    }
    void cr() { if(!r) r=new node(m+1,e); }
    void cl() { if(!l) l=new node(s,m); }
} *seg;

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    cin.exceptions(ios::badbit | ios::failbit);

    memset(st, -1, sizeof st);
    cin >> n >> q;
    for (int i = 1; i <= n; ++i) {
        int a, b; cin >> a >> b;
        events.pb({b, a, i});
        old[i] = {a, b};
    }
    sort(events.begin(), events.end());
    seg = new node(1, (int)1e9);
    int cnt = 0;
    for (auto [e, s, id]: events) {
       order[id] = ++cnt;
       pi qq = seg->rmq(s, e);
       if (qq.fi < s) {
           st[0][id] = qq.si;
       }
       seg->update(e, pi(s, id));
    }
    for (int i = 1; i < 20; ++i) {
        for (int j = 1; j <= n; ++j) {
            st[i][j] = st[i - 1][st[i - 1][j]];
        }
    }
    auto check = [&](int i, int j) { 
        return (old[j].fi <= old[i].si && old[i].si <= old[j].si);
    };
    while (q--) {
        int s, e; cin >> s >> e;
        if (s == e) {
            cout << 0 << '\n';
            continue;
        }
        if (check(s, e)) {
            cout << 1 << '\n';
            continue;
        }
        if (old[s].si > old[e].si) {
            cout << "impossible\n";
            continue;
        }
        int node = e, ans = 0;
        for (int i = 19; i >= 0; --i) {
            int pa = st[i][node];
            if (pa == -1 || old[pa].si <= old[s].si || old[pa].fi <= old[s].fi) continue;
            node = pa;
            ans += (1 << i);
        }
        if (check(s, node)) {
            cout << ans + 1 << '\n';
        } else if (check(s, st[0][node])) {
            cout << ans + 2 << '\n';
        } else cout << "impossible\n";
    }
    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 8160 KB Output is correct
2 Correct 161 ms 77824 KB Output is correct
3 Correct 177 ms 79872 KB Output is correct
4 Correct 257 ms 81096 KB Output is correct
5 Correct 184 ms 82116 KB Output is correct
6 Correct 189 ms 81720 KB Output is correct
7 Correct 223 ms 79236 KB Output is correct
8 Correct 148 ms 76220 KB Output is correct
9 Correct 173 ms 84484 KB Output is correct
10 Correct 185 ms 76876 KB Output is correct
11 Correct 188 ms 76152 KB Output is correct
12 Correct 93 ms 23328 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 8168 KB Output is correct
2 Correct 4 ms 8164 KB Output is correct
3 Correct 6 ms 9044 KB Output is correct
4 Correct 5 ms 9172 KB Output is correct
5 Correct 5 ms 8276 KB Output is correct
6 Correct 5 ms 8660 KB Output is correct
7 Correct 8 ms 9080 KB Output is correct
8 Correct 6 ms 9072 KB Output is correct
9 Correct 4 ms 8148 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 8168 KB Output is correct
2 Correct 4 ms 8164 KB Output is correct
3 Correct 6 ms 9044 KB Output is correct
4 Correct 5 ms 9172 KB Output is correct
5 Correct 5 ms 8276 KB Output is correct
6 Correct 5 ms 8660 KB Output is correct
7 Correct 8 ms 9080 KB Output is correct
8 Correct 6 ms 9072 KB Output is correct
9 Correct 4 ms 8148 KB Output is correct
10 Correct 3 ms 8148 KB Output is correct
11 Correct 4 ms 8148 KB Output is correct
12 Correct 6 ms 9072 KB Output is correct
13 Correct 6 ms 9172 KB Output is correct
14 Correct 4 ms 8276 KB Output is correct
15 Correct 5 ms 8660 KB Output is correct
16 Correct 7 ms 9172 KB Output is correct
17 Correct 6 ms 9072 KB Output is correct
18 Correct 4 ms 8176 KB Output is correct
19 Correct 39 ms 10188 KB Output is correct
20 Correct 51 ms 13804 KB Output is correct
21 Correct 36 ms 10452 KB Output is correct
22 Correct 31 ms 12240 KB Output is correct
23 Correct 32 ms 14192 KB Output is correct
24 Correct 40 ms 14088 KB Output is correct
25 Correct 37 ms 14108 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 8168 KB Output is correct
2 Correct 4 ms 8164 KB Output is correct
3 Correct 6 ms 9044 KB Output is correct
4 Correct 5 ms 9172 KB Output is correct
5 Correct 5 ms 8276 KB Output is correct
6 Correct 5 ms 8660 KB Output is correct
7 Correct 8 ms 9080 KB Output is correct
8 Correct 6 ms 9072 KB Output is correct
9 Correct 4 ms 8148 KB Output is correct
10 Correct 4 ms 8148 KB Output is correct
11 Correct 3 ms 8164 KB Output is correct
12 Correct 5 ms 9044 KB Output is correct
13 Correct 6 ms 9172 KB Output is correct
14 Correct 4 ms 8276 KB Output is correct
15 Correct 5 ms 8688 KB Output is correct
16 Correct 5 ms 9172 KB Output is correct
17 Correct 5 ms 9044 KB Output is correct
18 Correct 4 ms 8148 KB Output is correct
19 Correct 150 ms 76684 KB Output is correct
20 Correct 78 ms 20956 KB Output is correct
21 Correct 133 ms 44728 KB Output is correct
22 Correct 127 ms 70344 KB Output is correct
23 Correct 138 ms 75336 KB Output is correct
24 Correct 162 ms 82216 KB Output is correct
25 Correct 66 ms 11824 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 158 ms 77716 KB Output is correct
2 Correct 182 ms 79856 KB Output is correct
3 Correct 218 ms 80940 KB Output is correct
4 Correct 159 ms 84164 KB Output is correct
5 Correct 212 ms 76704 KB Output is correct
6 Correct 191 ms 84080 KB Output is correct
7 Correct 203 ms 83900 KB Output is correct
8 Correct 182 ms 82104 KB Output is correct
9 Correct 138 ms 75460 KB Output is correct
10 Correct 187 ms 83612 KB Output is correct
11 Correct 196 ms 81792 KB Output is correct
12 Correct 209 ms 83616 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 8160 KB Output is correct
2 Correct 161 ms 77824 KB Output is correct
3 Correct 177 ms 79872 KB Output is correct
4 Correct 257 ms 81096 KB Output is correct
5 Correct 184 ms 82116 KB Output is correct
6 Correct 189 ms 81720 KB Output is correct
7 Correct 223 ms 79236 KB Output is correct
8 Correct 148 ms 76220 KB Output is correct
9 Correct 173 ms 84484 KB Output is correct
10 Correct 185 ms 76876 KB Output is correct
11 Correct 188 ms 76152 KB Output is correct
12 Correct 93 ms 23328 KB Output is correct
13 Correct 5 ms 8168 KB Output is correct
14 Correct 4 ms 8164 KB Output is correct
15 Correct 6 ms 9044 KB Output is correct
16 Correct 5 ms 9172 KB Output is correct
17 Correct 5 ms 8276 KB Output is correct
18 Correct 5 ms 8660 KB Output is correct
19 Correct 8 ms 9080 KB Output is correct
20 Correct 6 ms 9072 KB Output is correct
21 Correct 4 ms 8148 KB Output is correct
22 Correct 3 ms 8148 KB Output is correct
23 Correct 4 ms 8148 KB Output is correct
24 Correct 6 ms 9072 KB Output is correct
25 Correct 6 ms 9172 KB Output is correct
26 Correct 4 ms 8276 KB Output is correct
27 Correct 5 ms 8660 KB Output is correct
28 Correct 7 ms 9172 KB Output is correct
29 Correct 6 ms 9072 KB Output is correct
30 Correct 4 ms 8176 KB Output is correct
31 Correct 39 ms 10188 KB Output is correct
32 Correct 51 ms 13804 KB Output is correct
33 Correct 36 ms 10452 KB Output is correct
34 Correct 31 ms 12240 KB Output is correct
35 Correct 32 ms 14192 KB Output is correct
36 Correct 40 ms 14088 KB Output is correct
37 Correct 37 ms 14108 KB Output is correct
38 Correct 4 ms 8148 KB Output is correct
39 Correct 3 ms 8164 KB Output is correct
40 Correct 5 ms 9044 KB Output is correct
41 Correct 6 ms 9172 KB Output is correct
42 Correct 4 ms 8276 KB Output is correct
43 Correct 5 ms 8688 KB Output is correct
44 Correct 5 ms 9172 KB Output is correct
45 Correct 5 ms 9044 KB Output is correct
46 Correct 4 ms 8148 KB Output is correct
47 Correct 150 ms 76684 KB Output is correct
48 Correct 78 ms 20956 KB Output is correct
49 Correct 133 ms 44728 KB Output is correct
50 Correct 127 ms 70344 KB Output is correct
51 Correct 138 ms 75336 KB Output is correct
52 Correct 162 ms 82216 KB Output is correct
53 Correct 66 ms 11824 KB Output is correct
54 Correct 158 ms 77716 KB Output is correct
55 Correct 182 ms 79856 KB Output is correct
56 Correct 218 ms 80940 KB Output is correct
57 Correct 159 ms 84164 KB Output is correct
58 Correct 212 ms 76704 KB Output is correct
59 Correct 191 ms 84080 KB Output is correct
60 Correct 203 ms 83900 KB Output is correct
61 Correct 182 ms 82104 KB Output is correct
62 Correct 138 ms 75460 KB Output is correct
63 Correct 187 ms 83612 KB Output is correct
64 Correct 196 ms 81792 KB Output is correct
65 Correct 209 ms 83616 KB Output is correct
66 Correct 3 ms 8148 KB Output is correct
67 Correct 153 ms 77812 KB Output is correct
68 Correct 179 ms 79852 KB Output is correct
69 Correct 252 ms 81296 KB Output is correct
70 Correct 182 ms 81984 KB Output is correct
71 Correct 189 ms 81600 KB Output is correct
72 Correct 206 ms 79160 KB Output is correct
73 Correct 149 ms 76248 KB Output is correct
74 Correct 175 ms 84448 KB Output is correct
75 Correct 187 ms 76856 KB Output is correct
76 Correct 176 ms 76176 KB Output is correct
77 Correct 92 ms 23256 KB Output is correct
78 Correct 3 ms 8148 KB Output is correct
79 Correct 5 ms 9044 KB Output is correct
80 Correct 5 ms 9172 KB Output is correct
81 Correct 5 ms 8276 KB Output is correct
82 Correct 5 ms 8660 KB Output is correct
83 Correct 5 ms 9172 KB Output is correct
84 Correct 5 ms 9044 KB Output is correct
85 Correct 4 ms 8148 KB Output is correct
86 Correct 36 ms 10188 KB Output is correct
87 Correct 39 ms 13812 KB Output is correct
88 Correct 36 ms 10484 KB Output is correct
89 Correct 30 ms 12236 KB Output is correct
90 Correct 31 ms 14268 KB Output is correct
91 Correct 31 ms 14048 KB Output is correct
92 Correct 34 ms 14108 KB Output is correct
93 Correct 136 ms 76728 KB Output is correct
94 Correct 76 ms 20924 KB Output is correct
95 Correct 134 ms 44716 KB Output is correct
96 Correct 131 ms 70424 KB Output is correct
97 Correct 164 ms 75364 KB Output is correct
98 Correct 142 ms 82196 KB Output is correct
99 Correct 58 ms 11868 KB Output is correct
100 Correct 202 ms 84188 KB Output is correct
101 Correct 180 ms 84040 KB Output is correct
102 Correct 181 ms 82164 KB Output is correct
103 Correct 194 ms 83776 KB Output is correct
104 Correct 180 ms 81832 KB Output is correct
105 Correct 210 ms 83740 KB Output is correct
106 Correct 129 ms 20568 KB Output is correct
107 Correct 131 ms 22940 KB Output is correct
108 Correct 165 ms 46832 KB Output is correct
109 Correct 165 ms 46808 KB Output is correct
110 Correct 208 ms 80608 KB Output is correct
111 Correct 226 ms 80684 KB Output is correct