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Submission #417154

# Submission time Handle Problem Language Result Execution time Memory
417154 2021-06-03T12:14:59 Z errorgorn Event Hopping 2 (JOI21_event2) C++17
7 / 100
 91 ms 12700 KB 
#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define ii pair<ll,ll>
#define fi first
#define se second
#define endl '\n'

#define puf push_front
#define pof pop_front
#define pub push_back
#define pob pop_back
#define lb lower_bound
#define ub upper_bound

#define rep(x,s,e) for (auto x=s-(s>e);x!=e-(s>e);(s<e?x++:x--))
#define all(x) (x).begin(),(x).end()
#define sz(x) (int) (x).size()

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

struct node{
	int s,e,m;
	int val=0;
	node *l,*r;
	
	node (int _s,int _e){
		s=_s,e=_e,m=s+e>>1;
		
		if (s!=e){
			l=new node(s,m);
			r=new node(m+1,e);
		}
	}
	
	void update(int i,int k){
		if (s==e) val=k;
		else{
			if (i<=m) l->update(i,k);
			else r->update(i,k);
			
			val=max(l->val,r->val);
		}
	}
	
	int query(int i,int j){
		if (s==i && e==j) return val;
		else if (j<=m) return l->query(i,j);
		else if (m<i) return r->query(i,j);
		else return max(l->query(i,m),r->query(m+1,j));
	}
} *root=new node(0,100005);

int n,k;
int l[100005],r[100005];
int nxt[100005];
int ans[100005];

int main(){
	cin.tie(0);
	cout.tie(0);
	cin.sync_with_stdio(false);
	
	cin>>n>>k;
	rep(x,0,n) cin>>l[x]>>r[x];
	
	rep(x,0,n){
		nxt[x]=lb(l,l+n,r[x])-l;
	}
	
	rep(x,n,0){
		ans[x]=root->query(nxt[x],n)+1;
		root->update(x,ans[x]);
	}
	
	if (ans[0]<k){
		cout<<"-1"<<endl;
		return 0;
	}
	
	int curr=0;
	while (k){
		if (ans[curr]>=k){
			cout<<curr+1<<endl;
			curr=nxt[curr];
			k--;
		}
		else curr++;
	}
}

Compilation message

event2.cpp: In constructor 'node::node(int, int)':
event2.cpp:29:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   29 |   s=_s,e=_e,m=s+e>>1;
      |               ~^~

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 9676 KB Output is correct
2 Correct 9 ms 9676 KB Output is correct
3 Correct 9 ms 9676 KB Output is correct
4 Correct 78 ms 11748 KB Output is correct
5 Correct 74 ms 11784 KB Output is correct
6 Correct 77 ms 11684 KB Output is correct
7 Correct 75 ms 11600 KB Output is correct
8 Correct 76 ms 11764 KB Output is correct
9 Correct 87 ms 11688 KB Output is correct
10 Correct 78 ms 11760 KB Output is correct
11 Correct 73 ms 11680 KB Output is correct
12 Correct 73 ms 11540 KB Output is correct
13 Correct 80 ms 12612 KB Output is correct
14 Correct 91 ms 12700 KB Output is correct
15 Correct 72 ms 12620 KB Output is correct
16 Correct 71 ms 12372 KB Output is correct
17 Correct 69 ms 12372 KB Output is correct
18 Correct 75 ms 12376 KB Output is correct
19 Correct 71 ms 12364 KB Output is correct
20 Correct 71 ms 12428 KB Output is correct
21 Correct 73 ms 12356 KB Output is correct
22 Correct 81 ms 12328 KB Output is correct
23 Correct 80 ms 12408 KB Output is correct
24 Correct 80 ms 12336 KB Output is correct
25 Correct 88 ms 12380 KB Output is correct
26 Correct 89 ms 12364 KB Output is correct
27 Correct 83 ms 12396 KB Output is correct
28 Correct 69 ms 12356 KB Output is correct
29 Correct 70 ms 12404 KB Output is correct
30 Correct 74 ms 12284 KB Output is correct
31 Correct 71 ms 12328 KB Output is correct
32 Correct 81 ms 12360 KB Output is correct
33 Correct 80 ms 12412 KB Output is correct
34 Correct 71 ms 12524 KB Output is correct
35 Correct 71 ms 12528 KB Output is correct
36 Correct 70 ms 12384 KB Output is correct
37 Correct 73 ms 12632 KB Output is correct
38 Correct 75 ms 12696 KB Output is correct
39 Correct 76 ms 12604 KB Output is correct
40 Correct 73 ms 12644 KB Output is correct
41 Correct 73 ms 12664 KB Output is correct
42 Correct 71 ms 12344 KB Output is correct
43 Correct 74 ms 12672 KB Output is correct
44 Correct 76 ms 12612 KB Output is correct
45 Correct 74 ms 12644 KB Output is correct
46 Correct 77 ms 12656 KB Output is correct

Subtask #2
0 / 1.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 9676 KB Output is correct
2 Correct 10 ms 9676 KB Output is correct
3 Incorrect 9 ms 9696 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 9676 KB Output is correct
2 Correct 10 ms 9676 KB Output is correct
3 Incorrect 9 ms 9696 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 61.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 9676 KB Output is correct
2 Correct 9 ms 9676 KB Output is correct
3 Correct 9 ms 9676 KB Output is correct
4 Correct 78 ms 11748 KB Output is correct
5 Correct 74 ms 11784 KB Output is correct
6 Correct 77 ms 11684 KB Output is correct
7 Correct 75 ms 11600 KB Output is correct
8 Correct 76 ms 11764 KB Output is correct
9 Correct 87 ms 11688 KB Output is correct
10 Correct 78 ms 11760 KB Output is correct
11 Correct 73 ms 11680 KB Output is correct
12 Correct 73 ms 11540 KB Output is correct
13 Correct 80 ms 12612 KB Output is correct
14 Correct 91 ms 12700 KB Output is correct
15 Correct 72 ms 12620 KB Output is correct
16 Correct 71 ms 12372 KB Output is correct
17 Correct 69 ms 12372 KB Output is correct
18 Correct 75 ms 12376 KB Output is correct
19 Correct 71 ms 12364 KB Output is correct
20 Correct 71 ms 12428 KB Output is correct
21 Correct 73 ms 12356 KB Output is correct
22 Correct 81 ms 12328 KB Output is correct
23 Correct 80 ms 12408 KB Output is correct
24 Correct 80 ms 12336 KB Output is correct
25 Correct 88 ms 12380 KB Output is correct
26 Correct 89 ms 12364 KB Output is correct
27 Correct 83 ms 12396 KB Output is correct
28 Correct 69 ms 12356 KB Output is correct
29 Correct 70 ms 12404 KB Output is correct
30 Correct 74 ms 12284 KB Output is correct
31 Correct 71 ms 12328 KB Output is correct
32 Correct 81 ms 12360 KB Output is correct
33 Correct 80 ms 12412 KB Output is correct
34 Correct 71 ms 12524 KB Output is correct
35 Correct 71 ms 12528 KB Output is correct
36 Correct 70 ms 12384 KB Output is correct
37 Correct 73 ms 12632 KB Output is correct
38 Correct 75 ms 12696 KB Output is correct
39 Correct 76 ms 12604 KB Output is correct
40 Correct 73 ms 12644 KB Output is correct
41 Correct 73 ms 12664 KB Output is correct
42 Correct 71 ms 12344 KB Output is correct
43 Correct 74 ms 12672 KB Output is correct
44 Correct 76 ms 12612 KB Output is correct
45 Correct 74 ms 12644 KB Output is correct
46 Correct 77 ms 12656 KB Output is correct
47 Correct 9 ms 9676 KB Output is correct
48 Correct 10 ms 9676 KB Output is correct
49 Incorrect 9 ms 9696 KB Output isn't correct
50 Halted 0 ms 0 KB -