oj.uz

Submission #944082

# Submission time Handle Problem Language Result Execution time Memory
944082 2024-03-12T08:11:23 Z pan Event Hopping (BOI22_events) C++17
100 / 100
 231 ms 54732 KB 
#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
//#include "bits_stdc++.h"
#define f first
#define s second
#define pb push_back
#define mp make_pair
#define lb lower_bound
#define ub upper_bound
#define input(x) scanf("%lld", &x);
#define input2(x, y) scanf("%lld%lld", &x, &y);
#define input3(x, y, z) scanf("%lld%lld%lld", &x, &y, &z);
#define input4(x, y, z, a) scanf("%lld%lld%lld%lld", &x, &y, &z, &a);
#define print(x, y) printf("%lld%c", x, y);
#define show(x) cerr << #x << " is " << x << endl;
#define show2(x,y) cerr << #x << " is " << x << " " << #y << " is " << y << endl;
#define show3(x,y,z) cerr << #x << " is " << x << " " << #y << " is " << y << " " << #z << " is " << z << endl;
#define discretize(x) sort(x.begin(), x.end()); x.erase(unique(x.begin(), x.end()), x.end());
using namespace std;
//using namespace __gnu_pbds;
//#define ordered_set tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update>
//#define ordered_multiset tree<int, null_type, less_equal<int>, srb_tree_tag, tree_order_statistics_node_update>
typedef long long ll;
typedef long double ld;
typedef pair<ld, ll> pd;
typedef pair<string, ll> psl;
typedef pair<ll, ll> pi;
typedef pair<pi, ll> pii;

ll const INF = 1e13;
bool compare(pii a, pii b)
{
	if (a.f.s==b.f.s) return a.f.f<b.f.f;
	return a.f.s<b.f.s;
}
// RMQ
struct node {
    int s, e, m; 
    pi val;
    node * l, * r; 
    node(int S, int E) { 
        s = S, e = E, m = (s + e) / 2;
        val = mp(INF, -1);
        if (s != e) { 
            l = new node(s, m); 
            r = new node(m + 1, e); 
        }
    }
    void update(int X, pi V) { 
        if (s == e)  {val = min(val, V);}
        else { 
            if (X <= m) l -> update(X, V); 
            else r -> update(X, V); 
            val = min(val = l -> val, r -> val); 
        }
    }
    pi query(int S, int E) {
        if (s == S && e == E) return val;
        else if (E <= m) return l -> query(S, E);
        else if (S >= m + 1) return r -> query(S, E);
        else return min(l -> query(S, m), r -> query(m + 1, E));
    }
}* root;

// Twok decomp
ll twok[100005][25];
int main()
{
	ll n,q, l, r;
	input2(n,q);
	vector<pii> eve(n);
	vector<pi> save(n);
	vector<ll> dis;
	for (ll i=0; i<n; ++i) {input2(save[i].f, save[i].s); eve[i] = mp(save[i], i); dis.pb(save[i].f), dis.pb(save[i].s);}
	discretize(dis);
	sort(eve.begin(), eve.end(), compare);
	root = new node(0, dis.size()-1);
	for (ll i=0; i<n; ++i)
	{
		ll l = lb(dis.begin(), dis.end(), eve[i].f.f)-dis.begin(), r = lb(dis.begin(), dis.end(), eve[i].f.s)-dis.begin(), ind = eve[i].s;
		root->update(r, mp(l, ind));
		pi nxt = root->query(l, r);
		if (nxt.f>=l) twok[ind][0] = -1;
		else  twok[ind][0] = nxt.s;
	}
	for (ll k=1; k<20; ++k)
	{
		for (ll x = 0; x<n; ++x)
		{
			if (twok[x][k-1]==-1) twok[x][k]=-1;
			else twok[x][k] = twok[twok[x][k-1]][k-1];
		}
	}
	while (q--)
	{
		input2(l, r);
		l--; r--;
		ll ans = 0;
		if (l==r) {print(0LL, '\n'); continue;}
		if (save[l].s>save[r].s){ cout << "impossible" << '\n'; continue;}
		if (save[r].f<=save[l].s) {print(1LL, '\n'); continue;}
		for (ll i=19; i>=0; --i)
		{
			if (twok[r][i]==-1) continue;
			if (save[twok[r][i]].f<= save[l].s) continue;
			r = twok[r][i];
			ans += (1LL<<i);
		}
		if (twok[r][0]==-1) {cout << "impossible" << endl; continue;}
		print(ans+2, '\n');
	}
	return 0;
}

Compilation message

events.cpp: In function 'int main()':
events.cpp:12:27: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 | #define input2(x, y) scanf("%lld%lld", &x, &y);
      |                      ~~~~~^~~~~~~~~~~~~~~~~~~~
events.cpp:71:2: note: in expansion of macro 'input2'
   71 |  input2(n,q);
      |  ^~~~~~
events.cpp:12:27: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 | #define input2(x, y) scanf("%lld%lld", &x, &y);
      |                      ~~~~~^~~~~~~~~~~~~~~~~~~~
events.cpp:75:26: note: in expansion of macro 'input2'
   75 |  for (ll i=0; i<n; ++i) {input2(save[i].f, save[i].s); eve[i] = mp(save[i], i); dis.pb(save[i].f), dis.pb(save[i].s);}
      |                          ^~~~~~
events.cpp:12:27: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 | #define input2(x, y) scanf("%lld%lld", &x, &y);
      |                      ~~~~~^~~~~~~~~~~~~~~~~~~~
events.cpp:97:3: note: in expansion of macro 'input2'
   97 |   input2(l, r);
      |   ^~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 115 ms 38556 KB Output is correct
3 Correct 135 ms 41536 KB Output is correct
4 Correct 153 ms 41928 KB Output is correct
5 Correct 139 ms 42936 KB Output is correct
6 Correct 142 ms 43972 KB Output is correct
7 Correct 150 ms 44564 KB Output is correct
8 Correct 228 ms 54732 KB Output is correct
9 Correct 222 ms 54720 KB Output is correct
10 Correct 176 ms 41920 KB Output is correct
11 Correct 172 ms 47076 KB Output is correct
12 Correct 193 ms 41408 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 1 ms 2652 KB Output is correct
4 Correct 2 ms 2760 KB Output is correct
5 Correct 1 ms 2652 KB Output is correct
6 Correct 1 ms 2764 KB Output is correct
7 Correct 1 ms 2908 KB Output is correct
8 Correct 1 ms 2908 KB Output is correct
9 Correct 1 ms 2652 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 1 ms 2652 KB Output is correct
4 Correct 2 ms 2760 KB Output is correct
5 Correct 1 ms 2652 KB Output is correct
6 Correct 1 ms 2764 KB Output is correct
7 Correct 1 ms 2908 KB Output is correct
8 Correct 1 ms 2908 KB Output is correct
9 Correct 1 ms 2652 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 2648 KB Output is correct
13 Correct 1 ms 2652 KB Output is correct
14 Correct 1 ms 2652 KB Output is correct
15 Correct 1 ms 2648 KB Output is correct
16 Correct 2 ms 2908 KB Output is correct
17 Correct 2 ms 2908 KB Output is correct
18 Correct 1 ms 2652 KB Output is correct
19 Correct 33 ms 5200 KB Output is correct
20 Correct 31 ms 4952 KB Output is correct
21 Correct 34 ms 5204 KB Output is correct
22 Correct 49 ms 5304 KB Output is correct
23 Correct 28 ms 5712 KB Output is correct
24 Correct 31 ms 5724 KB Output is correct
25 Correct 29 ms 5520 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 1 ms 2652 KB Output is correct
4 Correct 2 ms 2760 KB Output is correct
5 Correct 1 ms 2652 KB Output is correct
6 Correct 1 ms 2764 KB Output is correct
7 Correct 1 ms 2908 KB Output is correct
8 Correct 1 ms 2908 KB Output is correct
9 Correct 1 ms 2652 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 2652 KB Output is correct
13 Correct 1 ms 2652 KB Output is correct
14 Correct 2 ms 2652 KB Output is correct
15 Correct 1 ms 2652 KB Output is correct
16 Correct 1 ms 2908 KB Output is correct
17 Correct 1 ms 2908 KB Output is correct
18 Correct 1 ms 2652 KB Output is correct
19 Correct 86 ms 39868 KB Output is correct
20 Correct 87 ms 38956 KB Output is correct
21 Correct 90 ms 39840 KB Output is correct
22 Correct 90 ms 44564 KB Output is correct
23 Correct 97 ms 52420 KB Output is correct
24 Correct 99 ms 52416 KB Output is correct
25 Correct 33 ms 26816 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 110 ms 38504 KB Output is correct
2 Correct 120 ms 41744 KB Output is correct
3 Correct 151 ms 41664 KB Output is correct
4 Correct 224 ms 54548 KB Output is correct
5 Correct 180 ms 42060 KB Output is correct
6 Correct 151 ms 54212 KB Output is correct
7 Correct 152 ms 54208 KB Output is correct
8 Correct 186 ms 54392 KB Output is correct
9 Correct 97 ms 52420 KB Output is correct
10 Correct 131 ms 53952 KB Output is correct
11 Correct 130 ms 54048 KB Output is correct
12 Correct 137 ms 53956 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 115 ms 38556 KB Output is correct
3 Correct 135 ms 41536 KB Output is correct
4 Correct 153 ms 41928 KB Output is correct
5 Correct 139 ms 42936 KB Output is correct
6 Correct 142 ms 43972 KB Output is correct
7 Correct 150 ms 44564 KB Output is correct
8 Correct 228 ms 54732 KB Output is correct
9 Correct 222 ms 54720 KB Output is correct
10 Correct 176 ms 41920 KB Output is correct
11 Correct 172 ms 47076 KB Output is correct
12 Correct 193 ms 41408 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 344 KB Output is correct
15 Correct 1 ms 2652 KB Output is correct
16 Correct 2 ms 2760 KB Output is correct
17 Correct 1 ms 2652 KB Output is correct
18 Correct 1 ms 2764 KB Output is correct
19 Correct 1 ms 2908 KB Output is correct
20 Correct 1 ms 2908 KB Output is correct
21 Correct 1 ms 2652 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 1 ms 2648 KB Output is correct
25 Correct 1 ms 2652 KB Output is correct
26 Correct 1 ms 2652 KB Output is correct
27 Correct 1 ms 2648 KB Output is correct
28 Correct 2 ms 2908 KB Output is correct
29 Correct 2 ms 2908 KB Output is correct
30 Correct 1 ms 2652 KB Output is correct
31 Correct 33 ms 5200 KB Output is correct
32 Correct 31 ms 4952 KB Output is correct
33 Correct 34 ms 5204 KB Output is correct
34 Correct 49 ms 5304 KB Output is correct
35 Correct 28 ms 5712 KB Output is correct
36 Correct 31 ms 5724 KB Output is correct
37 Correct 29 ms 5520 KB Output is correct
38 Correct 0 ms 348 KB Output is correct
39 Correct 0 ms 348 KB Output is correct
40 Correct 1 ms 2652 KB Output is correct
41 Correct 1 ms 2652 KB Output is correct
42 Correct 2 ms 2652 KB Output is correct
43 Correct 1 ms 2652 KB Output is correct
44 Correct 1 ms 2908 KB Output is correct
45 Correct 1 ms 2908 KB Output is correct
46 Correct 1 ms 2652 KB Output is correct
47 Correct 86 ms 39868 KB Output is correct
48 Correct 87 ms 38956 KB Output is correct
49 Correct 90 ms 39840 KB Output is correct
50 Correct 90 ms 44564 KB Output is correct
51 Correct 97 ms 52420 KB Output is correct
52 Correct 99 ms 52416 KB Output is correct
53 Correct 33 ms 26816 KB Output is correct
54 Correct 110 ms 38504 KB Output is correct
55 Correct 120 ms 41744 KB Output is correct
56 Correct 151 ms 41664 KB Output is correct
57 Correct 224 ms 54548 KB Output is correct
58 Correct 180 ms 42060 KB Output is correct
59 Correct 151 ms 54212 KB Output is correct
60 Correct 152 ms 54208 KB Output is correct
61 Correct 186 ms 54392 KB Output is correct
62 Correct 97 ms 52420 KB Output is correct
63 Correct 131 ms 53952 KB Output is correct
64 Correct 130 ms 54048 KB Output is correct
65 Correct 137 ms 53956 KB Output is correct
66 Correct 0 ms 348 KB Output is correct
67 Correct 112 ms 41704 KB Output is correct
68 Correct 116 ms 41664 KB Output is correct
69 Correct 142 ms 41668 KB Output is correct
70 Correct 139 ms 42944 KB Output is correct
71 Correct 138 ms 43968 KB Output is correct
72 Correct 148 ms 44460 KB Output is correct
73 Correct 231 ms 54688 KB Output is correct
74 Correct 231 ms 54724 KB Output is correct
75 Correct 161 ms 42132 KB Output is correct
76 Correct 178 ms 46968 KB Output is correct
77 Correct 197 ms 41868 KB Output is correct
78 Correct 0 ms 348 KB Output is correct
79 Correct 1 ms 2652 KB Output is correct
80 Correct 1 ms 2652 KB Output is correct
81 Correct 1 ms 2648 KB Output is correct
82 Correct 1 ms 2648 KB Output is correct
83 Correct 2 ms 2908 KB Output is correct
84 Correct 2 ms 2756 KB Output is correct
85 Correct 1 ms 2652 KB Output is correct
86 Correct 35 ms 5232 KB Output is correct
87 Correct 30 ms 5044 KB Output is correct
88 Correct 35 ms 5204 KB Output is correct
89 Correct 50 ms 5200 KB Output is correct
90 Correct 27 ms 5712 KB Output is correct
91 Correct 30 ms 5712 KB Output is correct
92 Correct 33 ms 5600 KB Output is correct
93 Correct 84 ms 39808 KB Output is correct
94 Correct 82 ms 39104 KB Output is correct
95 Correct 91 ms 39872 KB Output is correct
96 Correct 90 ms 44372 KB Output is correct
97 Correct 100 ms 52352 KB Output is correct
98 Correct 100 ms 52392 KB Output is correct
99 Correct 33 ms 26772 KB Output is correct
100 Correct 145 ms 54212 KB Output is correct
101 Correct 163 ms 54208 KB Output is correct
102 Correct 154 ms 54464 KB Output is correct
103 Correct 160 ms 53996 KB Output is correct
104 Correct 139 ms 53704 KB Output is correct
105 Correct 148 ms 53928 KB Output is correct
106 Correct 136 ms 37812 KB Output is correct
107 Correct 138 ms 40900 KB Output is correct
108 Correct 138 ms 41616 KB Output is correct
109 Correct 142 ms 41844 KB Output is correct
110 Correct 166 ms 54208 KB Output is correct
111 Correct 167 ms 54220 KB Output is correct