oj.uz

Submission #799679

# Submission time Handle Problem Language Result Execution time Memory
799679 2023-07-31T19:34:45 Z TB_ Event Hopping (BOI22_events) C++17
100 / 100
 615 ms 327564 KB 
#include <bits/stdc++.h>
using namespace std;

// #undef _GLIBCXX_DEBUG                // disable run-time bound checking, etc
// #pragma GCC optimize("Ofast,inline") // Ofast = O3,fast-math,allow-store-data-races,no-protect-parens
// #pragma GCC optimize ("unroll-loops")

// #pragma GCC target("bmi,bmi2,lzcnt,popcnt")                      // bit manipulation
// #pragma GCC target("movbe")                                      // byte swap
// #pragma GCC target("aes,pclmul,rdrnd")                           // encryption
// #pragma GCC target("avx,avx2,f16c,fma,sse3,ssse3,sse4.1,sse4.2") // SIMD

// #include <bits/extc++.h>
// using namespace __gnu_pbds;
// template<class T>using ordered_set = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;
// template<class T>using ordered_multiset = tree<T, null_type, less_equal<T>, rb_tree_tag,tree_order_statistics_node_update>;

#define ll long long
#define INF (ll)1e9+7
#define fo(i, n) for(int i=0;i<((ll)n);i++)
#define deb(x) cout << #x << " = " << x << endl;
#define deb2(x, y) cout << #x << " = " << x << ", " << #y << " = " << y << endl
#define pb push_back
#define mp make_pair
#define F first
#define S second
#define LSOne(S) ((S) & (-S))
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
inline int readint(){ int v = 0; char c; while((c = getchar()) != EOF && c != ' ' && c != '\n'){ v *= 10; v += c - '0'; } return v; }
inline int readintsigned() { int v = 0; int sign = 1; char c = getchar(); if (c == '-') { sign = -1; } else { v += c - '0'; } while ((c = getchar()) != EOF && c != ' ' && c != '\n') { v *= 10; v += c - '0'; } return v * sign; }
inline string readstring() { string s; char c; while ((c = getchar()) != EOF && c != '\n' && c != ' ') { s.push_back(c); } return s; }
template <class result_t=std::chrono::milliseconds,class clock_t=std::chrono::steady_clock,class duration_t = std::chrono::milliseconds>
auto since(std::chrono::time_point<clock_t, duration_t> const& start){return std::chrono::duration_cast<result_t>(clock_t::now() - start);}
typedef pair<int, int> pii;
typedef pair<ll, ll> pl;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<pii> vpii;
typedef vector<pl> vpl;
typedef vector<vi> vvi;
typedef vector<vl> vvl;
typedef vector<vpii> vvpii;
typedef vector<vpl> vvpl;



struct Node{
    Node *lnode = 0, *rnode;
    int l, r;
    pl val = {INF, -1};
    pl val2 = {INF, -1};
    Node(int l, int r) : l(l), r(r){}

    pl query(int lo, int hi, pl &exclude){
        if(r <= lo || hi <= l) return {INF, -1};
        if(r <= hi && lo <= l) return (val == exclude?val2:val);
        push();
        return min(lnode->query(lo, hi, exclude), rnode->query(lo, hi, exclude));
    }

    void update(int x, int start, int index){
        if(r<=x || l>x) return;
        if(r-l == 1) {
            val2 = min(val2, {start, index});
            if(val>val2)swap(val, val2);
            return;
        }
        push();
        lnode->update(x, start, index);
        rnode->update(x, start, index);
        val = min(lnode->val, rnode->val);
        val2 = min(max(lnode->val, rnode->val), min(lnode->val2, rnode->val2));
    }

    void push(){
        if(!lnode){
            int mid = (l+r) / 2;
            lnode = new Node(l, mid);
            rnode = new Node(mid, r);
        }
    }
};

int main() {
    // cout << fixed << setprecision(20);
    // auto start = std::chrono::steady_clock::now(); // since(start).count()
    cin.tie(0)->sync_with_stdio(0);

    ll n, q, from, to;
    cin >> n >> q;

    Node st(0, INF);
    vpl event;
    
    fo(i, n){
        cin >> from >> to;
        event.pb({from, to});
        st.update(to, from, i);
    }
    vvl bl(n, vl(25, -1));
    fo(i, n){
        bl[i][0] = i;
        pl current = {event[i].F, i};
        pl res = st.query(event[i].F, event[i].S+1, current);
        if(res.S != -1) bl[i][0] = res.S;
    }
    fo(j, 23){
        fo(i, n)
            bl[i][j+1] = bl[bl[i][j]][j];
    }
    



    fo(x, q){
        cin >> from >> to;
        from--;
        to--;
        if(from == to){
            cout << "0\n";
            continue;
        }
        if(event[from].S<=event[to].S && event[from].S>=event[to].F){
            cout << "1\n";
            continue;
        }
        int ans = 2;
        for(int i = 21; i>=0; i--){
            if(event[bl[to][i]].F<=event[from].S) continue;
            ans+=(1<<i);
            to = bl[to][i];
        }
        to = bl[to][0];
        if(event[from].S<=event[to].S && event[from].S>=event[to].F)
            cout << ans << "\n";
        else cout << "impossible\n";
    }

    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 381 ms 185440 KB Output is correct
3 Correct 398 ms 190904 KB Output is correct
4 Correct 483 ms 194420 KB Output is correct
5 Correct 425 ms 207540 KB Output is correct
6 Correct 425 ms 217076 KB Output is correct
7 Correct 428 ms 212280 KB Output is correct
8 Correct 418 ms 283980 KB Output is correct
9 Correct 462 ms 327448 KB Output is correct
10 Correct 487 ms 182280 KB Output is correct
11 Correct 429 ms 219188 KB Output is correct
12 Correct 118 ms 50132 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 320 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 3 ms 2900 KB Output is correct
4 Correct 3 ms 2900 KB Output is correct
5 Correct 1 ms 596 KB Output is correct
6 Correct 3 ms 1748 KB Output is correct
7 Correct 5 ms 5204 KB Output is correct
8 Correct 5 ms 5196 KB Output is correct
9 Correct 2 ms 468 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 320 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 3 ms 2900 KB Output is correct
4 Correct 3 ms 2900 KB Output is correct
5 Correct 1 ms 596 KB Output is correct
6 Correct 3 ms 1748 KB Output is correct
7 Correct 5 ms 5204 KB Output is correct
8 Correct 5 ms 5196 KB Output is correct
9 Correct 2 ms 468 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 3 ms 2900 KB Output is correct
13 Correct 3 ms 2900 KB Output is correct
14 Correct 1 ms 596 KB Output is correct
15 Correct 3 ms 1748 KB Output is correct
16 Correct 5 ms 5196 KB Output is correct
17 Correct 5 ms 5092 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 35 ms 3748 KB Output is correct
20 Correct 40 ms 13256 KB Output is correct
21 Correct 35 ms 3824 KB Output is correct
22 Correct 32 ms 8736 KB Output is correct
23 Correct 43 ms 23500 KB Output is correct
24 Correct 43 ms 23536 KB Output is correct
25 Correct 46 ms 23112 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 320 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 3 ms 2900 KB Output is correct
4 Correct 3 ms 2900 KB Output is correct
5 Correct 1 ms 596 KB Output is correct
6 Correct 3 ms 1748 KB Output is correct
7 Correct 5 ms 5204 KB Output is correct
8 Correct 5 ms 5196 KB Output is correct
9 Correct 2 ms 468 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 3 ms 2900 KB Output is correct
13 Correct 3 ms 2900 KB Output is correct
14 Correct 1 ms 640 KB Output is correct
15 Correct 3 ms 1748 KB Output is correct
16 Correct 5 ms 5196 KB Output is correct
17 Correct 6 ms 5204 KB Output is correct
18 Correct 1 ms 592 KB Output is correct
19 Correct 365 ms 185356 KB Output is correct
20 Correct 143 ms 38200 KB Output is correct
21 Correct 344 ms 106748 KB Output is correct
22 Correct 365 ms 202592 KB Output is correct
23 Correct 501 ms 325412 KB Output is correct
24 Correct 494 ms 325176 KB Output is correct
25 Correct 94 ms 25864 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 395 ms 185400 KB Output is correct
2 Correct 433 ms 191044 KB Output is correct
3 Correct 496 ms 194320 KB Output is correct
4 Correct 445 ms 327508 KB Output is correct
5 Correct 424 ms 182400 KB Output is correct
6 Correct 595 ms 327280 KB Output is correct
7 Correct 609 ms 326988 KB Output is correct
8 Correct 537 ms 327468 KB Output is correct
9 Correct 494 ms 325112 KB Output is correct
10 Correct 558 ms 326780 KB Output is correct
11 Correct 553 ms 326740 KB Output is correct
12 Correct 549 ms 326712 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 381 ms 185440 KB Output is correct
3 Correct 398 ms 190904 KB Output is correct
4 Correct 483 ms 194420 KB Output is correct
5 Correct 425 ms 207540 KB Output is correct
6 Correct 425 ms 217076 KB Output is correct
7 Correct 428 ms 212280 KB Output is correct
8 Correct 418 ms 283980 KB Output is correct
9 Correct 462 ms 327448 KB Output is correct
10 Correct 487 ms 182280 KB Output is correct
11 Correct 429 ms 219188 KB Output is correct
12 Correct 118 ms 50132 KB Output is correct
13 Correct 1 ms 320 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 3 ms 2900 KB Output is correct
16 Correct 3 ms 2900 KB Output is correct
17 Correct 1 ms 596 KB Output is correct
18 Correct 3 ms 1748 KB Output is correct
19 Correct 5 ms 5204 KB Output is correct
20 Correct 5 ms 5196 KB Output is correct
21 Correct 2 ms 468 KB Output is correct
22 Correct 1 ms 212 KB Output is correct
23 Correct 1 ms 212 KB Output is correct
24 Correct 3 ms 2900 KB Output is correct
25 Correct 3 ms 2900 KB Output is correct
26 Correct 1 ms 596 KB Output is correct
27 Correct 3 ms 1748 KB Output is correct
28 Correct 5 ms 5196 KB Output is correct
29 Correct 5 ms 5092 KB Output is correct
30 Correct 1 ms 468 KB Output is correct
31 Correct 35 ms 3748 KB Output is correct
32 Correct 40 ms 13256 KB Output is correct
33 Correct 35 ms 3824 KB Output is correct
34 Correct 32 ms 8736 KB Output is correct
35 Correct 43 ms 23500 KB Output is correct
36 Correct 43 ms 23536 KB Output is correct
37 Correct 46 ms 23112 KB Output is correct
38 Correct 1 ms 212 KB Output is correct
39 Correct 0 ms 212 KB Output is correct
40 Correct 3 ms 2900 KB Output is correct
41 Correct 3 ms 2900 KB Output is correct
42 Correct 1 ms 640 KB Output is correct
43 Correct 3 ms 1748 KB Output is correct
44 Correct 5 ms 5196 KB Output is correct
45 Correct 6 ms 5204 KB Output is correct
46 Correct 1 ms 592 KB Output is correct
47 Correct 365 ms 185356 KB Output is correct
48 Correct 143 ms 38200 KB Output is correct
49 Correct 344 ms 106748 KB Output is correct
50 Correct 365 ms 202592 KB Output is correct
51 Correct 501 ms 325412 KB Output is correct
52 Correct 494 ms 325176 KB Output is correct
53 Correct 94 ms 25864 KB Output is correct
54 Correct 395 ms 185400 KB Output is correct
55 Correct 433 ms 191044 KB Output is correct
56 Correct 496 ms 194320 KB Output is correct
57 Correct 445 ms 327508 KB Output is correct
58 Correct 424 ms 182400 KB Output is correct
59 Correct 595 ms 327280 KB Output is correct
60 Correct 609 ms 326988 KB Output is correct
61 Correct 537 ms 327468 KB Output is correct
62 Correct 494 ms 325112 KB Output is correct
63 Correct 558 ms 326780 KB Output is correct
64 Correct 553 ms 326740 KB Output is correct
65 Correct 549 ms 326712 KB Output is correct
66 Correct 1 ms 212 KB Output is correct
67 Correct 393 ms 185336 KB Output is correct
68 Correct 422 ms 190884 KB Output is correct
69 Correct 464 ms 194352 KB Output is correct
70 Correct 459 ms 207556 KB Output is correct
71 Correct 477 ms 217048 KB Output is correct
72 Correct 432 ms 212280 KB Output is correct
73 Correct 429 ms 284152 KB Output is correct
74 Correct 473 ms 327424 KB Output is correct
75 Correct 474 ms 182320 KB Output is correct
76 Correct 433 ms 219192 KB Output is correct
77 Correct 118 ms 50104 KB Output is correct
78 Correct 1 ms 212 KB Output is correct
79 Correct 4 ms 2900 KB Output is correct
80 Correct 4 ms 2900 KB Output is correct
81 Correct 1 ms 596 KB Output is correct
82 Correct 4 ms 1748 KB Output is correct
83 Correct 6 ms 5196 KB Output is correct
84 Correct 5 ms 5204 KB Output is correct
85 Correct 1 ms 468 KB Output is correct
86 Correct 31 ms 3788 KB Output is correct
87 Correct 41 ms 13232 KB Output is correct
88 Correct 37 ms 3992 KB Output is correct
89 Correct 31 ms 8652 KB Output is correct
90 Correct 43 ms 23500 KB Output is correct
91 Correct 42 ms 23552 KB Output is correct
92 Correct 46 ms 23084 KB Output is correct
93 Correct 364 ms 185468 KB Output is correct
94 Correct 150 ms 38256 KB Output is correct
95 Correct 368 ms 106800 KB Output is correct
96 Correct 369 ms 202660 KB Output is correct
97 Correct 511 ms 325208 KB Output is correct
98 Correct 496 ms 325108 KB Output is correct
99 Correct 87 ms 25788 KB Output is correct
100 Correct 612 ms 327188 KB Output is correct
101 Correct 614 ms 326952 KB Output is correct
102 Correct 567 ms 327564 KB Output is correct
103 Correct 522 ms 326804 KB Output is correct
104 Correct 553 ms 326648 KB Output is correct
105 Correct 535 ms 326744 KB Output is correct
106 Correct 198 ms 37104 KB Output is correct
107 Correct 244 ms 40116 KB Output is correct
108 Correct 384 ms 108740 KB Output is correct
109 Correct 377 ms 108940 KB Output is correct
110 Correct 558 ms 326972 KB Output is correct
111 Correct 615 ms 327084 KB Output is correct