#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
using vi = vector<int>;
using pii = pair<int, int>;
using vvi = vector<vi>;
#define sz(x) int(x.size())
const int INF = 100'000'000;
const int Z = (1<<20);
vector<int> segtree;
void set(int i, int v)
{
i += Z;
segtree[i] = v;
for(i >>= 1; i >= 1; i >>= 1) segtree[i] = max(segtree[i<<1], segtree[(i<<1) | 1]);
}
vector<pii> segtree2;
void set2(int i, int v)
{
// cerr << "\n\n" << "set2 " << i << ' ' << v << '\n';
i += Z;
segtree2[i].first = v;
for(i >>= 1; i >= 1; i >>= 1) segtree2[i] = max(segtree2[i<<1], segtree2[(i<<1) | 1]);
// cerr << "root = " << segtree2[1]
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int n;
cin >> n;
pii a[1+n];
for(int i = 1; i <= n; i++)
{
cin >> a[i].first;
a[i].second = i;
}
sort(a+1, a+n+1);
int t;
vi dp(1+n);
vi dpmx(1+n);
dp[0] = dpmx[0] = 0;
for(int i = 1; i <= n; i++)
{
t = -INF;
if(a[i].first > i)
{
;
}
else
{
if(i - a[i].first >= 0)
t = dpmx[i - a[i].first];
}
dp[i] = max(-INF, t + 1);
dpmx[i] = max(dp[i], dpmx[i-1]);
// cerr << i << " : " << t << '\n';
}
int team_count = dp[n];
// int Z = (1<<20);
int z = 0;
for(int i = 1; i <= n; i++) z = max(z, a[i].first);
int lo = 1, hi = n;
while(lo != hi)
{
int mxs = (lo+hi)/2;
segtree = vector<int>(Z<<1, -INF);
int l = 0;
int r = -1;
vi new_dp(1+n, -INF);
new_dp[0] = 0;
// cerr << "n = " << n << '\n';
for(int i = 1; i <= n; i++)
{
int nl = max(0, i-mxs);
int nr = max(-1, i - a[i].first);
if(nr - nl < 5)
{
for(int g = nl; g <= nr; g++)
new_dp[i] = max(new_dp[i], new_dp[g]+1);
}
if(nl > nr) continue;
while(r < nr)
{
r++;
set(r, new_dp[r]);
}
while(l > nl)
{
l--;
set(l, new_dp[l]);
}
while(r > nr)
{
set(r, -INF);
r--;
}
while(l < nl)
{
set(l, -INF);
l++;
}
new_dp[i] = max(-INF, segtree[1]+1);
}
if(new_dp[n] == team_count)
hi = mxs;
else
lo = mxs+1;
}
// cerr << team_count << ' ' << lo << '\n';
int mxs = lo;
// cerr << "\n\n\n\n\n";
// cerr << lo << ' ' << hi << " : " << mxs << '\n';
segtree2 = vector<pii>(Z<<1, {-INF, -1});
for(int i = 0; i <= n; i++) segtree2[Z+i].second = i;
int l = 0;
int r = -1;
vi new_dp(1+n, -INF);
new_dp[0] = 0;
vi prv(1+n, -1);
// cerr << "n = " << n << '\n';
for(int i = 1; i <= n; i++)
{
int nl = max(0, i-mxs);
int nr = max(-1, i - a[i].first);
if(nr - nl < 20)
{
for(int i2 = nl; i2 <= nr; i2++)
{
if(new_dp[i2]+1 >= new_dp[i])
{
new_dp[i] = new_dp[i2] + 1;
prv[i] = i2;
}
}
continue;
}
// if(i-mxs > i - a[i]) con
// cerr << "i = " << i << " : " << "nl nr = " << nl << ' ' << nr << '\n';
if(nl > nr) continue;
// cerr << "journey " << l << ' ' << r << " -> " << nl << ' ' << nr << '\n';
while(r < nr)
{
r++;
set2(r, new_dp[r]);
}
while(l > nl)
{
l--;
set2(l, new_dp[l]);
}
while(r > nr)
{
set2(r, -INF);
r--;
}
while(l < nl)
{
set2(l, -INF);
l++;
}
// cerr << l << ' ' << r << '\n';
// cerr << "st = " << segtree2[1].first << ' ' << segtree2[1].second << '\n';
new_dp[i] = max(-INF, segtree2[1].first+1);
prv[i] = segtree2[1].second;
// cerr << i << " : " << new_dp[i] << ' ' << prv[i] << '\n';
}
vvi teams;
int I = n;
while(I != 0)
{
teams.push_back(vi(0));
// cerr << I << ' ' << prv[I] << '\n';
for(int q = I; q > prv[I]; q--)
teams.back().push_back(a[q].second);
I = prv[I];
}
cout << team_count << '\n';
for(int f = 0; f < team_count; f++)
{
cout << sz(teams[f]) << ' ';
for(int w: teams[f]) cout << w << ' ';
cout << '\n';
}
return 0;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
9 ms |
16716 KB |
Output is correct |
| 2 |
Correct |
28 ms |
33076 KB |
Output is correct |
| 3 |
Correct |
26 ms |
33148 KB |
Output is correct |
| 4 |
Correct |
27 ms |
33124 KB |
Output is correct |
| 5 |
Correct |
28 ms |
33056 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
28 ms |
33080 KB |
Output is correct |
| 2 |
Correct |
27 ms |
33100 KB |
Output is correct |
| 3 |
Correct |
30 ms |
33048 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
26 ms |
33060 KB |
Output is correct |
| 2 |
Correct |
38 ms |
33128 KB |
Output is correct |
| 3 |
Correct |
34 ms |
33124 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
47 ms |
33184 KB |
Output is correct |
| 2 |
Correct |
42 ms |
33112 KB |
Output is correct |
| 3 |
Correct |
42 ms |
33168 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
43 ms |
33188 KB |
Output is correct |
| 2 |
Correct |
35 ms |
33176 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
165 ms |
34872 KB |
Output is correct |
| 2 |
Correct |
203 ms |
34772 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
198 ms |
35024 KB |
Output is correct |
| 2 |
Correct |
249 ms |
34684 KB |
Output is correct |
| 3 |
Correct |
199 ms |
35076 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1885 ms |
51280 KB |
Output is correct |
| 2 |
Correct |
1758 ms |
52916 KB |
Output is correct |
| 3 |
Correct |
1731 ms |
52144 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2276 ms |
59888 KB |
Output is correct |
| 2 |
Execution timed out |
2588 ms |
107488 KB |
Time limit exceeded |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1233 ms |
62328 KB |
Output is correct |
| 2 |
Correct |
281 ms |
63300 KB |
Output is correct |
| 3 |
Correct |
2397 ms |
60024 KB |
Output is correct |
| 4 |
Correct |
2302 ms |
59520 KB |
Output is correct |
