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| #include <iostream>
#include <cstdio>
#include <queue>
#include <climits>
#define INF INT_MAX
using namespace std;
const int N = 1e3 + 10, M = 2.5e5 + 10;
int n, st, ed, k[N], f[N], d[N], cur[N];
int idx = -1, hd[N], nxt[M], edg[M], wt[M];
bool bfs()
{
for (int i = st; i <= ed; i++)
d[i] = -1;
d[st] = 0;
cur[st] = hd[st];
queue <int> q;
q.push(st);
while (!q.empty())
{
int t = q.front();
q.pop();
for (int i = hd[t]; ~i; i = nxt[i])
{
int ver = edg[i];
if (d[ver] == -1 && wt[i])
{
cur[ver] = hd[ver];
d[ver] = d[t] + 1;
if (ver == ed)
return true;
q.push(ver);
}
}
}
return false;
}
int find(int x, int limit)
{
if (x == ed)
return limit;
int res = 0;
for (int i = cur[x]; ~i && res < limit; i = nxt[i])
{
cur[x] = i;
int ver = edg[i];
if (d[ver] == d[x] + 1 && wt[i])
{
int t = find(ver, min(wt[i], limit - res));
if (!t)
d[ver] = -1;
wt[i] -= t;
wt[i ^ 1] += t;
res += t;
}
}
return res;
}
int dinic()
{
int res = 0, flow;
while (bfs())
while (flow = find(st, INF))
res += flow;
return res;
}
void add(int x, int y, int z)
{
nxt[++idx] = hd[x];
hd[x] = idx;
edg[idx] = y;
wt[idx] = z;
}
int main()
{
cin >> n;
st = 0;
ed = n << 1 | 1;
for (int i = st; i <= ed; i++)
hd[i] = -1;
for (int i = 1; i <= n; i++)
cin >> k[i];
int s = 0;
for (int i = 1; i <= n; i++)
{
add(i, i + n, 1);
add(i + n, i, 0);
f[i] = 1;
for (int j = 1; j < i; j++)
if (k[j] <= k[i])
f[i] = max(f[i], f[j] + 1);
for (int j = 1; j < i; j++)
if (k[j] <= k[i] && f[j] + 1 == f[i])
{
add(j + n, i, 1);
add(i, j + n, 0);
}
s = max(s, f[i]);
if (f[i] == 1)
{
add(st, i, 1);
add(i, st, 0);
}
}
for (int i = 1; i <= n; i++)
if (f[i] == s)
{
add(n + i, ed, 1);
add(ed, n + i, 1);
}
cout << s << endl;
if (s == 1)
{
cout << n << endl << n;
return 0;
}
int res = dinic();
cout << res << endl;
for (int i = 0; i <= idx; i += 2)
if ((edg[i ^ 1] == st && edg[i] == 1)
|| (edg[i ^ 1] == 1 && edg[i] == n + 1)
|| (edg[i ^ 1] == n && edg[i] == n + n)
|| (edg[i ^ 1] == n + n && edg[i] == ed))
wt[i] = INF;
cout << res + dinic();
return 0;
}
|