#include<bits/stdc++.h>
#define pii pair<int,int>
#define fi first
#define se second
#define mp make_pair
using namespace std;
const int N=1e6+5;
int n,a[N][2];
pii dp[N][2];
bool vis[N][2];
void calc(int i,int j)
{
if(vis[i][j]) return ;
vis[i][j]=true;
dp[i][j].fi=1e9;
dp[i][j].se=-1e9;
if(a[i][j]<=a[i+1][0])
{
calc(i+1,0);
dp[i][j].fi=min(dp[i][j].fi,dp[i+1][0].fi);
dp[i][j].se=max(dp[i][j].se,dp[i+1][0].se);
}
if(a[i][j]<=a[i+1][1])
{
calc(i+1,1);
dp[i][j].fi=min(dp[i][j].fi,dp[i+1][1].fi+1);
dp[i][j].se=max(dp[i][j].se,dp[i+1][1].se+1);
}
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cin>>n;
n*=2;
for(int j=0;j<2;j++)
{
for(int i=1;i<=n;i++) cin>>a[i][j];
}
vis[n][0]=true;
vis[n][1]=true;
calc(0,0);
if(dp[0][0].fi>n/2||dp[0][0].se<n/2) return cout<<-1,0;
int need=n/2;
int last=0;
for(int i=1;i<=n;i++)
{
if(a[i][0]>=a[i-1][last]&&dp[i][0].fi<=need&&dp[i][0].se>=need)
{
last=0;
cout<<"A";
}
else
{
last=1;
need--;
cout<<"B";
}
}
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
384 KB |
Output is correct |
2 |
Correct |
0 ms |
384 KB |
Output is correct |
3 |
Correct |
0 ms |
384 KB |
Output is correct |
4 |
Correct |
0 ms |
384 KB |
Output is correct |
5 |
Correct |
1 ms |
384 KB |
Output is correct |
6 |
Correct |
2 ms |
640 KB |
Output is correct |
7 |
Correct |
1 ms |
512 KB |
Output is correct |
8 |
Correct |
1 ms |
640 KB |
Output is correct |
9 |
Correct |
1 ms |
640 KB |
Output is correct |
10 |
Correct |
1 ms |
512 KB |
Output is correct |
11 |
Correct |
2 ms |
640 KB |
Output is correct |
12 |
Correct |
2 ms |
640 KB |
Output is correct |
13 |
Correct |
2 ms |
640 KB |
Output is correct |
14 |
Correct |
2 ms |
640 KB |
Output is correct |
15 |
Correct |
2 ms |
640 KB |
Output is correct |
16 |
Correct |
1 ms |
640 KB |
Output is correct |
17 |
Correct |
2 ms |
640 KB |
Output is correct |
18 |
Correct |
2 ms |
640 KB |
Output is correct |
19 |
Correct |
2 ms |
640 KB |
Output is correct |
20 |
Correct |
1 ms |
640 KB |
Output is correct |
21 |
Correct |
2 ms |
640 KB |
Output is correct |
22 |
Correct |
1 ms |
640 KB |
Output is correct |
23 |
Correct |
1 ms |
640 KB |
Output is correct |
24 |
Correct |
2 ms |
640 KB |
Output is correct |
25 |
Correct |
1 ms |
640 KB |
Output is correct |
26 |
Correct |
2 ms |
640 KB |
Output is correct |
27 |
Correct |
1 ms |
640 KB |
Output is correct |
28 |
Correct |
2 ms |
640 KB |
Output is correct |
29 |
Correct |
1 ms |
640 KB |
Output is correct |
30 |
Correct |
1 ms |
640 KB |
Output is correct |
31 |
Correct |
2 ms |
640 KB |
Output is correct |
32 |
Correct |
1 ms |
640 KB |
Output is correct |
33 |
Correct |
2 ms |
640 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
384 KB |
Output is correct |
2 |
Correct |
0 ms |
384 KB |
Output is correct |
3 |
Correct |
0 ms |
384 KB |
Output is correct |
4 |
Correct |
0 ms |
384 KB |
Output is correct |
5 |
Correct |
1 ms |
384 KB |
Output is correct |
6 |
Correct |
2 ms |
640 KB |
Output is correct |
7 |
Correct |
1 ms |
512 KB |
Output is correct |
8 |
Correct |
1 ms |
640 KB |
Output is correct |
9 |
Correct |
1 ms |
640 KB |
Output is correct |
10 |
Correct |
1 ms |
512 KB |
Output is correct |
11 |
Correct |
2 ms |
640 KB |
Output is correct |
12 |
Correct |
2 ms |
640 KB |
Output is correct |
13 |
Correct |
2 ms |
640 KB |
Output is correct |
14 |
Correct |
2 ms |
640 KB |
Output is correct |
15 |
Correct |
2 ms |
640 KB |
Output is correct |
16 |
Correct |
1 ms |
640 KB |
Output is correct |
17 |
Correct |
2 ms |
640 KB |
Output is correct |
18 |
Correct |
2 ms |
640 KB |
Output is correct |
19 |
Correct |
2 ms |
640 KB |
Output is correct |
20 |
Correct |
1 ms |
640 KB |
Output is correct |
21 |
Correct |
2 ms |
640 KB |
Output is correct |
22 |
Correct |
1 ms |
640 KB |
Output is correct |
23 |
Correct |
1 ms |
640 KB |
Output is correct |
24 |
Correct |
2 ms |
640 KB |
Output is correct |
25 |
Correct |
1 ms |
640 KB |
Output is correct |
26 |
Correct |
2 ms |
640 KB |
Output is correct |
27 |
Correct |
1 ms |
640 KB |
Output is correct |
28 |
Correct |
2 ms |
640 KB |
Output is correct |
29 |
Correct |
1 ms |
640 KB |
Output is correct |
30 |
Correct |
1 ms |
640 KB |
Output is correct |
31 |
Correct |
2 ms |
640 KB |
Output is correct |
32 |
Correct |
1 ms |
640 KB |
Output is correct |
33 |
Correct |
2 ms |
640 KB |
Output is correct |
34 |
Correct |
219 ms |
8056 KB |
Output is correct |
35 |
Correct |
307 ms |
68472 KB |
Output is correct |
36 |
Correct |
292 ms |
67320 KB |
Output is correct |
37 |
Correct |
302 ms |
68812 KB |
Output is correct |
38 |
Correct |
294 ms |
68600 KB |
Output is correct |
39 |
Correct |
291 ms |
69112 KB |
Output is correct |
40 |
Correct |
313 ms |
73404 KB |
Output is correct |
41 |
Correct |
309 ms |
70140 KB |
Output is correct |
42 |
Correct |
305 ms |
71420 KB |
Output is correct |
43 |
Correct |
324 ms |
73720 KB |
Output is correct |
44 |
Correct |
319 ms |
73776 KB |
Output is correct |
45 |
Correct |
323 ms |
73848 KB |
Output is correct |
46 |
Correct |
307 ms |
73976 KB |
Output is correct |
47 |
Correct |
317 ms |
73848 KB |
Output is correct |
48 |
Correct |
305 ms |
73920 KB |
Output is correct |
49 |
Correct |
367 ms |
73816 KB |
Output is correct |
50 |
Correct |
320 ms |
73848 KB |
Output is correct |
51 |
Correct |
328 ms |
73848 KB |
Output is correct |
52 |
Correct |
252 ms |
73848 KB |
Output is correct |
53 |
Correct |
249 ms |
73720 KB |
Output is correct |
54 |
Correct |
241 ms |
73720 KB |
Output is correct |
55 |
Correct |
241 ms |
73720 KB |
Output is correct |
56 |
Correct |
329 ms |
73696 KB |
Output is correct |
57 |
Correct |
283 ms |
73336 KB |
Output is correct |
58 |
Correct |
290 ms |
73848 KB |
Output is correct |
59 |
Correct |
280 ms |
73724 KB |
Output is correct |
60 |
Correct |
265 ms |
69368 KB |
Output is correct |
61 |
Correct |
290 ms |
73848 KB |
Output is correct |
62 |
Correct |
278 ms |
72788 KB |
Output is correct |
63 |
Correct |
283 ms |
73720 KB |
Output is correct |
64 |
Correct |
270 ms |
71288 KB |
Output is correct |
65 |
Correct |
281 ms |
73848 KB |
Output is correct |