1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
| #include <bits/stdc++.h>
#define R register
#define ll long long
#define cmax(a, b) ((a < b) ? b : a)
#define cmin(a, b) ((a < b) ? a : b)
#define sum(a, b, mod) ((a + b) % mod)
const int MaxN = 2e4 + 10;
const int MaxM = 5e5 + 10;
const int inf = (1 << 30);
struct edge
{
int to, next, cap;
};
edge e[MaxM];
int n, m, s = 20000, t = 20001, cnt = 1, ans, tmp;
int head[MaxN], dep[MaxN], cur[MaxN], a[MaxN], vis[MaxN], to[MaxN];
inline void add(int u, int v, int c)
{
++cnt;
e[cnt].to = v;
e[cnt].next = head[u];
e[cnt].cap = c;
head[u] = cnt;
}
inline void add_edge(int u, int v, int c) { add(u, v, c), add(v, u, 0); }
inline int read()
{
int x = 0;
char ch = getchar();
while (ch > '9' || ch < '0')
ch = getchar();
while (ch <= '9' && ch >= '0')
x = (x << 1) + (x << 3) + (ch ^ 48), ch = getchar();
return x;
}
inline int bfs()
{
memset(dep, 0, sizeof(dep));
memcpy(cur, head, sizeof(head));
std::queue<int> q;
dep[s] = 1;
q.push(s);
while (!q.empty())
{
int u = q.front();
q.pop();
for (int i = head[u]; i; i = e[i].next)
{
int v = e[i].to, c = e[i].cap;
if (dep[v] || !c)
continue;
dep[v] = dep[u] + 1;
q.push(v);
}
}
return dep[t];
}
inline int dinic(int u, int flow)
{
if (u == t)
return flow;
int rest = flow;
for (int i = cur[u]; i && (flow - rest < flow); i = e[i].next)
{
int v = e[i].to, c = e[i].cap;
if (dep[v] != dep[u] + 1 || !c)
continue;
int k = dinic(v, cmin(rest, c));
if (!k)
dep[v] = dep[u] + 1;
else
{
e[i].cap -= k;
e[i ^ 1].cap += k;
rest -= k;
if (e[i].to > 5000)
vis[e[i].to - 5000] = 1;
to[u] = e[i].to;
}
}
if (flow - rest < flow)
dep[u] = -1;
return flow - rest;
}
inline void solve()
{
int now = 0;
while (bfs())
while ((now = dinic(s, inf)))
ans -= now;
}
int main()
{
n = read();
while (1)
{
ans++, tmp++;
for (int i = 1; i < tmp; i++)
{
int x = sqrt(i + tmp);
if (x * x == (i + tmp))
add_edge(i, tmp + 5000, 1);
}
add_edge(s, tmp, 1), add_edge(tmp + 5000, t, 1);
solve();
if (ans > n)
break;
}
--tmp;
printf("%d\n", tmp);
for (int i = 1; i <= tmp; i++)
{
if (vis[i])
continue;
printf("%d ", i);
int t = i;
while (to[t])
{
printf("%d ", to[t] - 5000);
t = to[t] - 5000;
}
puts("");
}
return 0;
}
|