-
Notifications
You must be signed in to change notification settings - Fork 59
/
back ivv.cpp
64 lines (56 loc) · 1.01 KB
/
back ivv.cpp
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
# include <fstream>
# include <algorithm>
# include <cstring>
# define NR 1000
using namespace std;
ifstream f("ivv.in");
ofstream g("ivv.out");
int i,j,n,m,x,y,sol;
int a[NR], var[NR], V[NR];
bool verifica ()
{
int i,j,o, ok=1, ci=n+1;
for (i=1; i<=n; ++i)
V[i]=a[i];
for (i=n; i>=1 && ok; --i)
{
if (var[i]!=V[i]) {
ok=0;
for (j=min(ci-1, i); j>=1; --j) {
if (V[j]==var[i]) {
for (o=j; o<=i; ++o)
V[o]=var[i];
ci=j; ok=1;
break;
}
}
}
}
if (ok)
{
for (i=1; i<=n; ++i)
g<<var[i]<<" ";
g<<"\n";
}
return ok;
}
void back (int k) {
if (k==n+1) {
if (verifica ()) ++sol;
}
else {
var[k]=1;
back(k+1);
var[k]=0;
back(k+1);
}
}
int main ()
{
f>>n;
for (i=1; i<=n; ++i)
f>>a[i];
back (1);
g<<sol<<"\n";
return 0;
}