#include <bits/stdc++.h>
using namespace std;
const int nx=1e5+5, kx=17, inf=2e9;
int n, k, a[nx], b[nx], pa[nx][kx], mx, vl;
struct range
{
int l, r;
range(int l, int r): l(l), r(r){}
bool operator< (const range &o) const
{
if (r==o.r) return l<o.l;
return r<o.r;
}
};
vector<range> v, cur;
int query(int u, int limit)
{
int res=0;
if (limit==inf) limit--;
for (int i=kx-1; i>=0; i--) if (v[pa[u][i]].r<=limit) res+=(1<<i), u=pa[u][i];
return res;
}
int main()
{
cin.tie(NULL)->sync_with_stdio(false);
cin>>n>>k;
v.push_back(range(0, 0));
for (int i=1; i<=n; i++) cin>>a[i]>>b[i], v.push_back(range(a[i], b[i])), pa[i][0]=n+1;
v.push_back(range({inf, inf}));
sort(v.begin(), v.end());
int lst=0;
for (int i=1; i<=n+1; i++)
{
mx=max(mx, v[i].l);
while (lst<=n+1&&v[lst].r<=mx) pa[lst++][0]=i;
}
for (int i=1; i<kx; i++) for (int j=0; j<=n+1; j++) pa[j][i]=pa[pa[j][i-1]][i-1];
/*
for (int i=0; i<=n+1; i++)
{
cout<<"debug "<<i<<' '<<v[i].l<<' '<<v[i].r<<':';
for (int j=0; j<=2; j++) cout<<pa[i][j]<<' ';
cout<<'\n';
}
*/
vl=query(0, inf);
if (vl<k) return cout<<-1, 0;
cur.push_back(range(0, 0));
for (int i=1; i<=n; i++)
{
if (!k) continue;
auto itr=upper_bound(cur.begin(), cur.end(), range(a[i], b[i]));
if (itr!=cur.end()&&itr->l<b[i]) continue;
if (prev(itr)->r>a[i]) continue;
int tmp=vl, pidx=lower_bound(v.begin(), v.end(), *prev(itr))-v.begin(), cidx=lower_bound(v.begin(), v.end(), range(a[i], b[i]))-v.begin();
tmp-=query(pidx, (itr==cur.end())?inf:itr->l);
tmp+=query(pidx, a[i]);
tmp+=query(cidx, (itr==cur.end())?inf:itr->l);
//cout<<"vl "<<i<<' '<<tmp<<'\n';
if (tmp>=k-1)
{
k--;
cur.push_back(range(a[i], b[i]));
vl=tmp;
cout<<i<<'\n';
}
}
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
348 KB |
Output is correct |
2 |
Correct |
1 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
460 KB |
Output is correct |
4 |
Correct |
46 ms |
12316 KB |
Output is correct |
5 |
Correct |
47 ms |
12376 KB |
Output is correct |
6 |
Correct |
43 ms |
12300 KB |
Output is correct |
7 |
Correct |
46 ms |
12324 KB |
Output is correct |
8 |
Correct |
44 ms |
12492 KB |
Output is correct |
9 |
Correct |
43 ms |
12496 KB |
Output is correct |
10 |
Correct |
42 ms |
12492 KB |
Output is correct |
11 |
Correct |
39 ms |
12488 KB |
Output is correct |
12 |
Correct |
34 ms |
11728 KB |
Output is correct |
13 |
Correct |
34 ms |
11724 KB |
Output is correct |
14 |
Correct |
35 ms |
11724 KB |
Output is correct |
15 |
Correct |
33 ms |
11728 KB |
Output is correct |
16 |
Correct |
25 ms |
10792 KB |
Output is correct |
17 |
Correct |
27 ms |
10844 KB |
Output is correct |
18 |
Correct |
26 ms |
10768 KB |
Output is correct |
19 |
Correct |
24 ms |
10712 KB |
Output is correct |
20 |
Correct |
25 ms |
10712 KB |
Output is correct |
21 |
Correct |
24 ms |
10712 KB |
Output is correct |
22 |
Correct |
24 ms |
10568 KB |
Output is correct |
23 |
Correct |
21 ms |
10712 KB |
Output is correct |
24 |
Correct |
23 ms |
10528 KB |
Output is correct |
25 |
Correct |
24 ms |
10712 KB |
Output is correct |
26 |
Correct |
23 ms |
10564 KB |
Output is correct |
27 |
Correct |
22 ms |
10656 KB |
Output is correct |
28 |
Correct |
18 ms |
10708 KB |
Output is correct |
29 |
Correct |
18 ms |
10700 KB |
Output is correct |
30 |
Correct |
22 ms |
10704 KB |
Output is correct |
31 |
Correct |
19 ms |
10712 KB |
Output is correct |
32 |
Correct |
20 ms |
10604 KB |
Output is correct |
33 |
Correct |
21 ms |
10764 KB |
Output is correct |
34 |
Correct |
29 ms |
11460 KB |
Output is correct |
35 |
Correct |
27 ms |
10960 KB |
Output is correct |
36 |
Correct |
21 ms |
10712 KB |
Output is correct |
37 |
Correct |
32 ms |
11724 KB |
Output is correct |
38 |
Correct |
30 ms |
11556 KB |
Output is correct |
39 |
Correct |
33 ms |
11728 KB |
Output is correct |
40 |
Correct |
32 ms |
11524 KB |
Output is correct |
41 |
Correct |
35 ms |
11616 KB |
Output is correct |
42 |
Correct |
23 ms |
10708 KB |
Output is correct |
43 |
Correct |
32 ms |
11736 KB |
Output is correct |
44 |
Correct |
38 ms |
11728 KB |
Output is correct |
45 |
Correct |
32 ms |
11728 KB |
Output is correct |
46 |
Correct |
35 ms |
11700 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
344 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
344 KB |
Output is correct |
5 |
Correct |
0 ms |
344 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
8 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
344 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
344 KB |
Output is correct |
5 |
Correct |
0 ms |
344 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
8 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
348 KB |
Output is correct |
2 |
Correct |
1 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
460 KB |
Output is correct |
4 |
Correct |
46 ms |
12316 KB |
Output is correct |
5 |
Correct |
47 ms |
12376 KB |
Output is correct |
6 |
Correct |
43 ms |
12300 KB |
Output is correct |
7 |
Correct |
46 ms |
12324 KB |
Output is correct |
8 |
Correct |
44 ms |
12492 KB |
Output is correct |
9 |
Correct |
43 ms |
12496 KB |
Output is correct |
10 |
Correct |
42 ms |
12492 KB |
Output is correct |
11 |
Correct |
39 ms |
12488 KB |
Output is correct |
12 |
Correct |
34 ms |
11728 KB |
Output is correct |
13 |
Correct |
34 ms |
11724 KB |
Output is correct |
14 |
Correct |
35 ms |
11724 KB |
Output is correct |
15 |
Correct |
33 ms |
11728 KB |
Output is correct |
16 |
Correct |
25 ms |
10792 KB |
Output is correct |
17 |
Correct |
27 ms |
10844 KB |
Output is correct |
18 |
Correct |
26 ms |
10768 KB |
Output is correct |
19 |
Correct |
24 ms |
10712 KB |
Output is correct |
20 |
Correct |
25 ms |
10712 KB |
Output is correct |
21 |
Correct |
24 ms |
10712 KB |
Output is correct |
22 |
Correct |
24 ms |
10568 KB |
Output is correct |
23 |
Correct |
21 ms |
10712 KB |
Output is correct |
24 |
Correct |
23 ms |
10528 KB |
Output is correct |
25 |
Correct |
24 ms |
10712 KB |
Output is correct |
26 |
Correct |
23 ms |
10564 KB |
Output is correct |
27 |
Correct |
22 ms |
10656 KB |
Output is correct |
28 |
Correct |
18 ms |
10708 KB |
Output is correct |
29 |
Correct |
18 ms |
10700 KB |
Output is correct |
30 |
Correct |
22 ms |
10704 KB |
Output is correct |
31 |
Correct |
19 ms |
10712 KB |
Output is correct |
32 |
Correct |
20 ms |
10604 KB |
Output is correct |
33 |
Correct |
21 ms |
10764 KB |
Output is correct |
34 |
Correct |
29 ms |
11460 KB |
Output is correct |
35 |
Correct |
27 ms |
10960 KB |
Output is correct |
36 |
Correct |
21 ms |
10712 KB |
Output is correct |
37 |
Correct |
32 ms |
11724 KB |
Output is correct |
38 |
Correct |
30 ms |
11556 KB |
Output is correct |
39 |
Correct |
33 ms |
11728 KB |
Output is correct |
40 |
Correct |
32 ms |
11524 KB |
Output is correct |
41 |
Correct |
35 ms |
11616 KB |
Output is correct |
42 |
Correct |
23 ms |
10708 KB |
Output is correct |
43 |
Correct |
32 ms |
11736 KB |
Output is correct |
44 |
Correct |
38 ms |
11728 KB |
Output is correct |
45 |
Correct |
32 ms |
11728 KB |
Output is correct |
46 |
Correct |
35 ms |
11700 KB |
Output is correct |
47 |
Correct |
0 ms |
344 KB |
Output is correct |
48 |
Correct |
0 ms |
348 KB |
Output is correct |
49 |
Correct |
0 ms |
348 KB |
Output is correct |
50 |
Correct |
0 ms |
344 KB |
Output is correct |
51 |
Correct |
0 ms |
344 KB |
Output is correct |
52 |
Correct |
0 ms |
348 KB |
Output is correct |
53 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
54 |
Halted |
0 ms |
0 KB |
- |