oj.uz

Submission #417128

# Submission time Handle Problem Language Result Execution time Memory
417128 2021-06-03T12:01:20 Z jamezzz Event Hopping 2 (JOI21_event2) C++14
32 / 100
 429 ms 2364 KB 
#include <bits/stdc++.h>
using namespace std;

#define sf scanf
#define pf printf
#define fi first
#define se second
#define pb emplace_back
#define INF 1023456789
#define all(x) x.begin(),x.end()
#define sz(x) (int)x.size()
typedef pair<int,int> ii;

int n,k,l,r;
vector<ii> v,t;
multiset<ii> s;

int val[100005],sfx[100005],pos[100005];

void sorted(){
	bool can=false;
	for(int i=n-1;i>=0;--i){
		pos[i]=upper_bound(v.begin()+i+1,v.end(),
								ii(v[i].se,INF))-v.begin();
		val[i]=sfx[pos[i]]+1;
		if(val[i]>=k)can=true;
		sfx[i]=max(sfx[i+1],val[i]);
	}
	if(!can)pf("-1\n"),exit(0);
	int c=0;
	for(int i=0;i<k;++i){
		for(int j=c;j<n;++j){
			if(i+val[j]>=k){
				pf("%d\n",c+1);
				c=pos[j];
				break;
			}
		}
	}
	exit(0);
}

int num(int x){
	t.clear();
	for(int i=x;i<n;++i)t.pb(v[i]);
	sort(all(t),[&](ii &a,ii &b){return a.se<b.se;});
	int curr=-1,cnt=0;
	for(int i=0;i<sz(t);++i){
		if(t[i].fi<curr)continue;
		auto it=s.lower_bound(ii(t[i].fi,0));
		if(it!=s.end()&&(*it).fi<t[i].se)continue;
		if(it!=s.begin()&&t[i].fi<(*--it).se)continue;
		curr=t[i].se;++cnt;
	}
	return cnt;
}

int main(){
	sf("%d%d",&n,&k);
	for(int i=0;i<n;++i){
		sf("%d%d",&l,&r);
		v.pb(l,r);
	}
	if(n>3000)sorted();
	int cnt=1;
	bool pos=false;
	for(int i=0;i<n;++i){
		
		auto it=s.lower_bound(ii(v[i].fi,0));
		if(it!=s.end()&&(*it).fi<v[i].se)continue;
		if(it!=s.begin()&&v[i].fi<(*--it).se)continue;
		
		s.insert(ii(v[i].fi,v[i].se));
		
		int tot=num(i+1)+cnt;
		if(tot>=k){
			pos=true;
			if(cnt==k)break;
			++cnt;
			continue;
		}
		else s.erase(s.find(v[i]));
	}
	if(!pos)pf("-1\n"),exit(0);
	
	for(int i=0;i<n;++i){
		if(s.count(v[i])){
			pf("%d\n",i+1);
			s.erase(s.find(v[i]));
		}
	}
}

/*
5 4
1 3
2 5
6 8
8 9
10 15

4 3
1 4
3 5
4 9
7 10

10 6
77412002 93858605
244306432 318243514
280338037 358494212
439397354 492065507
485779890 529132783
571714810 632053254
659767854 709114867
718405631 733610573
786950301 815106357
878719468 899999649
*/

Compilation message

event2.cpp: In function 'int main()':
event2.cpp:59:4: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |  sf("%d%d",&n,&k);
      |    ^
event2.cpp:61:5: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |   sf("%d%d",&l,&r);
      |     ^

Subtask #1
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Incorrect 28 ms 2364 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
1.0 / 1.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 0 ms 204 KB Output is correct
15 Correct 0 ms 204 KB Output is correct
16 Correct 0 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 0 ms 204 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 1 ms 204 KB Output is correct
22 Correct 1 ms 204 KB Output is correct
23 Correct 0 ms 204 KB Output is correct
24 Correct 0 ms 204 KB Output is correct
25 Correct 1 ms 204 KB Output is correct
26 Correct 0 ms 204 KB Output is correct
27 Correct 1 ms 204 KB Output is correct

Subtask #3
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 0 ms 204 KB Output is correct
15 Correct 0 ms 204 KB Output is correct
16 Correct 0 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 0 ms 204 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 1 ms 204 KB Output is correct
22 Correct 1 ms 204 KB Output is correct
23 Correct 0 ms 204 KB Output is correct
24 Correct 0 ms 204 KB Output is correct
25 Correct 1 ms 204 KB Output is correct
26 Correct 0 ms 204 KB Output is correct
27 Correct 1 ms 204 KB Output is correct
28 Correct 38 ms 332 KB Output is correct
29 Correct 32 ms 332 KB Output is correct
30 Correct 17 ms 404 KB Output is correct
31 Correct 6 ms 400 KB Output is correct
32 Correct 4 ms 332 KB Output is correct
33 Correct 271 ms 332 KB Output is correct
34 Correct 266 ms 332 KB Output is correct
35 Correct 429 ms 496 KB Output is correct
36 Correct 415 ms 520 KB Output is correct
37 Correct 354 ms 388 KB Output is correct
38 Correct 274 ms 332 KB Output is correct
39 Correct 373 ms 524 KB Output is correct
40 Correct 372 ms 412 KB Output is correct
41 Correct 357 ms 380 KB Output is correct
42 Correct 275 ms 332 KB Output is correct
43 Correct 194 ms 392 KB Output is correct
44 Correct 162 ms 440 KB Output is correct
45 Correct 144 ms 436 KB Output is correct
46 Correct 283 ms 452 KB Output is correct
47 Correct 87 ms 332 KB Output is correct
48 Correct 56 ms 332 KB Output is correct
49 Correct 26 ms 460 KB Output is correct
50 Correct 263 ms 332 KB Output is correct
51 Correct 94 ms 332 KB Output is correct
52 Correct 69 ms 460 KB Output is correct
53 Correct 11 ms 460 KB Output is correct
54 Correct 267 ms 440 KB Output is correct
55 Correct 151 ms 508 KB Output is correct
56 Correct 149 ms 464 KB Output is correct
57 Correct 147 ms 436 KB Output is correct
58 Correct 149 ms 448 KB Output is correct
59 Correct 149 ms 484 KB Output is correct
60 Correct 153 ms 448 KB Output is correct
61 Correct 148 ms 452 KB Output is correct
62 Correct 158 ms 480 KB Output is correct
63 Correct 142 ms 452 KB Output is correct
64 Correct 87 ms 460 KB Output is correct

Subtask #4
0 / 61.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Incorrect 28 ms 2364 KB Output isn't correct
5 Halted 0 ms 0 KB -