#include <bits/stdc++.h>
using namespace std;
using ll=long long;
const int maxn=100001;
struct event{
ll l, r;
int id;
event(){}
bool operator<(const event& e) const {
if(l != e.l)return l < e.l;
return r < e.r;
}
};
event e[maxn];
int nxt[maxn][18];
bool was[maxn];
int cnt(int i, int j){
int ans = 0;
int x=i;
for(int k = 17; k >= 0; k--){
if(e[nxt[i][k]].r <= e[j].l){
i=nxt[i][k];
ans+=(1<<k);
}
}
// cout<<'\n'<<x<<' '<<j<<' '<<ans<<'\n';
return ans;
}
int main(){
int n, k;
cin >> n >> k;
e[0].l=e[0].r=e[0].id=0;
e[n + 1].l = 1e10;
e[n + 1].r = 1e10 + 1;
e[n + 1].id = n + 1;
vector<pair<ll,int>> he{{0, 0}, {0, 0}};
for(int i = 1; i <= n; i++){
cin >> e[i].l >> e[i].r;
e[i].id = i;
he.push_back({e[i].l, i + n});
he.push_back({e[i].r, i});
}
sort(he.begin(), he.end());
for(int i=0;i<=n+1;i++){
for(int j=0;j<18;j++)
nxt[i][j] = n + 1;
}
// cout<<"a\n";
int cur = -1;
for(int i = he.size()-1; i >= 0; i--){
// cout<<i<<' '<<he[i].first<<' '<<he[i].second<<' '<<cur<<endl;
if(he[i].second > n){
if(cur < 0 || e[he[i].second - n].r< e[cur].r)
cur = he[i].second - n;
}
else if(cur > 0){
nxt[he[i].second][0]=cur;
for(int j=1;j<18;j++){
nxt[he[i].second][j] = nxt[nxt[he[i].second][j - 1]][j - 1];
}
}
}
vector<int> ans;
set<event> s;
int sum = cnt(0, n + 1);
s.insert(e[0]);
s.insert(e[n + 1]);
for(int i = 1;i <= n && ans.size() < k; i++){
auto R=s.upper_bound(e[i]), L=R;
L--;
if(R->l < e[i].r || L->r > e[i].l)continue;
int x = cnt(L->id, R->id) - cnt(L->id, i) - cnt(i, R->id) - 1;
if(sum - x < k)continue;
sum -= x;
ans.push_back(i);
s.insert(e[i]);
}
if(ans.size() < k){
cout<<-1;
return 0;
}
for(int i:ans)cout<<i<<'\n';
cout<<'\n';
}
Compilation message
event2.cpp: In function 'int cnt(int, int)':
event2.cpp:22:9: warning: unused variable 'x' [-Wunused-variable]
22 | int x=i;
| ^
event2.cpp: In function 'int main()':
event2.cpp:72:40: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
72 | for(int i = 1;i <= n && ans.size() < k; i++){
| ~~~~~~~~~~~^~~
event2.cpp:82:19: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
82 | if(ans.size() < k){
| ~~~~~~~~~~~^~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
212 KB |
Output is correct |
2 |
Correct |
0 ms |
304 KB |
Output is correct |
3 |
Correct |
0 ms |
212 KB |
Output is correct |
4 |
Correct |
154 ms |
21436 KB |
Output is correct |
5 |
Correct |
153 ms |
21048 KB |
Output is correct |
6 |
Correct |
153 ms |
20760 KB |
Output is correct |
7 |
Correct |
139 ms |
20084 KB |
Output is correct |
8 |
Incorrect |
107 ms |
14824 KB |
Output isn't correct |
9 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
212 KB |
Output is correct |
2 |
Correct |
0 ms |
304 KB |
Output is correct |
3 |
Correct |
0 ms |
212 KB |
Output is correct |
4 |
Correct |
0 ms |
212 KB |
Output is correct |
5 |
Correct |
0 ms |
212 KB |
Output is correct |
6 |
Correct |
1 ms |
212 KB |
Output is correct |
7 |
Correct |
1 ms |
300 KB |
Output is correct |
8 |
Correct |
0 ms |
212 KB |
Output is correct |
9 |
Correct |
1 ms |
212 KB |
Output is correct |
10 |
Correct |
1 ms |
304 KB |
Output is correct |
11 |
Correct |
1 ms |
308 KB |
Output is correct |
12 |
Correct |
1 ms |
212 KB |
Output is correct |
13 |
Correct |
1 ms |
312 KB |
Output is correct |
14 |
Correct |
0 ms |
212 KB |
Output is correct |
15 |
Correct |
0 ms |
212 KB |
Output is correct |
16 |
Correct |
1 ms |
212 KB |
Output is correct |
17 |
Correct |
0 ms |
212 KB |
Output is correct |
18 |
Correct |
0 ms |
212 KB |
Output is correct |
19 |
Correct |
1 ms |
212 KB |
Output is correct |
20 |
Correct |
0 ms |
212 KB |
Output is correct |
21 |
Correct |
1 ms |
212 KB |
Output is correct |
22 |
Correct |
1 ms |
212 KB |
Output is correct |
23 |
Correct |
0 ms |
308 KB |
Output is correct |
24 |
Correct |
0 ms |
212 KB |
Output is correct |
25 |
Correct |
1 ms |
212 KB |
Output is correct |
26 |
Correct |
1 ms |
212 KB |
Output is correct |
27 |
Correct |
1 ms |
212 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
212 KB |
Output is correct |
2 |
Correct |
0 ms |
304 KB |
Output is correct |
3 |
Correct |
0 ms |
212 KB |
Output is correct |
4 |
Correct |
0 ms |
212 KB |
Output is correct |
5 |
Correct |
0 ms |
212 KB |
Output is correct |
6 |
Correct |
1 ms |
212 KB |
Output is correct |
7 |
Correct |
1 ms |
300 KB |
Output is correct |
8 |
Correct |
0 ms |
212 KB |
Output is correct |
9 |
Correct |
1 ms |
212 KB |
Output is correct |
10 |
Correct |
1 ms |
304 KB |
Output is correct |
11 |
Correct |
1 ms |
308 KB |
Output is correct |
12 |
Correct |
1 ms |
212 KB |
Output is correct |
13 |
Correct |
1 ms |
312 KB |
Output is correct |
14 |
Correct |
0 ms |
212 KB |
Output is correct |
15 |
Correct |
0 ms |
212 KB |
Output is correct |
16 |
Correct |
1 ms |
212 KB |
Output is correct |
17 |
Correct |
0 ms |
212 KB |
Output is correct |
18 |
Correct |
0 ms |
212 KB |
Output is correct |
19 |
Correct |
1 ms |
212 KB |
Output is correct |
20 |
Correct |
0 ms |
212 KB |
Output is correct |
21 |
Correct |
1 ms |
212 KB |
Output is correct |
22 |
Correct |
1 ms |
212 KB |
Output is correct |
23 |
Correct |
0 ms |
308 KB |
Output is correct |
24 |
Correct |
0 ms |
212 KB |
Output is correct |
25 |
Correct |
1 ms |
212 KB |
Output is correct |
26 |
Correct |
1 ms |
212 KB |
Output is correct |
27 |
Correct |
1 ms |
212 KB |
Output is correct |
28 |
Correct |
4 ms |
852 KB |
Output is correct |
29 |
Correct |
4 ms |
832 KB |
Output is correct |
30 |
Correct |
4 ms |
852 KB |
Output is correct |
31 |
Correct |
3 ms |
852 KB |
Output is correct |
32 |
Correct |
4 ms |
852 KB |
Output is correct |
33 |
Correct |
4 ms |
852 KB |
Output is correct |
34 |
Correct |
5 ms |
852 KB |
Output is correct |
35 |
Correct |
5 ms |
980 KB |
Output is correct |
36 |
Correct |
6 ms |
956 KB |
Output is correct |
37 |
Correct |
5 ms |
832 KB |
Output is correct |
38 |
Correct |
4 ms |
852 KB |
Output is correct |
39 |
Correct |
5 ms |
852 KB |
Output is correct |
40 |
Correct |
5 ms |
852 KB |
Output is correct |
41 |
Correct |
4 ms |
852 KB |
Output is correct |
42 |
Correct |
4 ms |
852 KB |
Output is correct |
43 |
Correct |
5 ms |
852 KB |
Output is correct |
44 |
Correct |
4 ms |
852 KB |
Output is correct |
45 |
Correct |
4 ms |
828 KB |
Output is correct |
46 |
Correct |
5 ms |
852 KB |
Output is correct |
47 |
Correct |
4 ms |
832 KB |
Output is correct |
48 |
Correct |
4 ms |
852 KB |
Output is correct |
49 |
Correct |
4 ms |
852 KB |
Output is correct |
50 |
Correct |
4 ms |
852 KB |
Output is correct |
51 |
Correct |
4 ms |
852 KB |
Output is correct |
52 |
Correct |
4 ms |
852 KB |
Output is correct |
53 |
Correct |
4 ms |
852 KB |
Output is correct |
54 |
Correct |
4 ms |
852 KB |
Output is correct |
55 |
Correct |
5 ms |
960 KB |
Output is correct |
56 |
Correct |
5 ms |
980 KB |
Output is correct |
57 |
Correct |
5 ms |
964 KB |
Output is correct |
58 |
Correct |
4 ms |
980 KB |
Output is correct |
59 |
Correct |
4 ms |
932 KB |
Output is correct |
60 |
Correct |
4 ms |
852 KB |
Output is correct |
61 |
Correct |
4 ms |
852 KB |
Output is correct |
62 |
Correct |
6 ms |
852 KB |
Output is correct |
63 |
Correct |
4 ms |
828 KB |
Output is correct |
64 |
Correct |
4 ms |
828 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
212 KB |
Output is correct |
2 |
Correct |
0 ms |
304 KB |
Output is correct |
3 |
Correct |
0 ms |
212 KB |
Output is correct |
4 |
Correct |
154 ms |
21436 KB |
Output is correct |
5 |
Correct |
153 ms |
21048 KB |
Output is correct |
6 |
Correct |
153 ms |
20760 KB |
Output is correct |
7 |
Correct |
139 ms |
20084 KB |
Output is correct |
8 |
Incorrect |
107 ms |
14824 KB |
Output isn't correct |
9 |
Halted |
0 ms |
0 KB |
- |