#include<bits/stdc++.h>
#define PRINT(x) cerr<<#x<<'='<<x<<endl;
#define NL(x) " \n"[(x)]
#define lld long long
#define pil pair<int,lld>
#define pli pair<lld,int>
#define pll pair<lld,lld>
#define pii pair<int,int>
#define pb push_back
#define fi first
#define se second
#define mid (l+r)/2
#define endl '\n'
#define all(a) begin(a),end(a)
#define sz(a) int((a).size())
#define LINF 1000000000000000LL
#define INF 1000000000
#define EPS 1e-9
using namespace std;
#define MAXN 500010
int A[2*MAXN], B[2*MAXN];
string rez;
pii Ai[2*MAXN], Bi[2*MAXN];
pii unija(pii A, pii B) {
return {min(A.fi, B.fi), max(A.se, B.se)};
}
bool in(int x, pii A) {
return (A.fi <= x && x <= A.se);
}
int main() {
ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);cerr.tie(0);
int N; cin >> N;
for(int i = 1; i <= 2*N; i++) cin >> A[i];
for(int i = 1; i <= 2*N; i++) cin >> B[i];
for(int i = 1; i <= 2*N; i++) Ai[i] = Bi[i] = {INF, -INF};
Ai[2*N] = {1, 1}; Bi[2*N] = {0, 0};
for(int i = 2*N-1; i >= 1; i--) {
if(A[i] <= A[i+1]) Ai[i] = unija(Ai[i], Ai[i+1]);
if(A[i] <= B[i+1]) Ai[i] = unija(Ai[i], Bi[i+1]);
Ai[i] = {Ai[i].fi+1, Ai[i].se+1};
if(B[i] <= A[i+1]) Bi[i] = unija(Bi[i], Ai[i+1]);
if(B[i] <= B[i+1]) Bi[i] = unija(Bi[i], Bi[i+1]);
}
int cnt = N, prev = 0;
for(int i = 1; i <= 2*N; i++) {
if(prev <= A[i] && in(cnt, Ai[i])) {
rez += "A";
prev = A[i];
cnt--;
} else if(prev <= B[i] && in(cnt, Bi[i])) {
rez += "B";
prev = B[i];
} else {
cout << -1 << endl;
return 0;
}
}
cout << rez;
return 0;
}
# |
Verdict |
Execution time |
Memory |
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 |
1 ms |
512 KB |
Output is correct |
7 |
Correct |
1 ms |
384 KB |
Output is correct |
8 |
Correct |
1 ms |
384 KB |
Output is correct |
9 |
Correct |
1 ms |
384 KB |
Output is correct |
10 |
Correct |
1 ms |
384 KB |
Output is correct |
11 |
Correct |
2 ms |
512 KB |
Output is correct |
12 |
Correct |
1 ms |
512 KB |
Output is correct |
13 |
Correct |
2 ms |
512 KB |
Output is correct |
14 |
Correct |
1 ms |
512 KB |
Output is correct |
15 |
Correct |
1 ms |
512 KB |
Output is correct |
16 |
Correct |
2 ms |
512 KB |
Output is correct |
17 |
Correct |
2 ms |
512 KB |
Output is correct |
18 |
Correct |
2 ms |
512 KB |
Output is correct |
19 |
Correct |
2 ms |
512 KB |
Output is correct |
20 |
Correct |
1 ms |
512 KB |
Output is correct |
21 |
Correct |
1 ms |
512 KB |
Output is correct |
22 |
Correct |
1 ms |
512 KB |
Output is correct |
23 |
Correct |
2 ms |
512 KB |
Output is correct |
24 |
Correct |
2 ms |
512 KB |
Output is correct |
25 |
Correct |
1 ms |
512 KB |
Output is correct |
26 |
Correct |
1 ms |
512 KB |
Output is correct |
27 |
Correct |
1 ms |
512 KB |
Output is correct |
28 |
Correct |
1 ms |
512 KB |
Output is correct |
29 |
Correct |
1 ms |
512 KB |
Output is correct |
30 |
Correct |
1 ms |
512 KB |
Output is correct |
31 |
Correct |
1 ms |
512 KB |
Output is correct |
32 |
Correct |
2 ms |
512 KB |
Output is correct |
33 |
Correct |
1 ms |
512 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
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 |
1 ms |
512 KB |
Output is correct |
7 |
Correct |
1 ms |
384 KB |
Output is correct |
8 |
Correct |
1 ms |
384 KB |
Output is correct |
9 |
Correct |
1 ms |
384 KB |
Output is correct |
10 |
Correct |
1 ms |
384 KB |
Output is correct |
11 |
Correct |
2 ms |
512 KB |
Output is correct |
12 |
Correct |
1 ms |
512 KB |
Output is correct |
13 |
Correct |
2 ms |
512 KB |
Output is correct |
14 |
Correct |
1 ms |
512 KB |
Output is correct |
15 |
Correct |
1 ms |
512 KB |
Output is correct |
16 |
Correct |
2 ms |
512 KB |
Output is correct |
17 |
Correct |
2 ms |
512 KB |
Output is correct |
18 |
Correct |
2 ms |
512 KB |
Output is correct |
19 |
Correct |
2 ms |
512 KB |
Output is correct |
20 |
Correct |
1 ms |
512 KB |
Output is correct |
21 |
Correct |
1 ms |
512 KB |
Output is correct |
22 |
Correct |
1 ms |
512 KB |
Output is correct |
23 |
Correct |
2 ms |
512 KB |
Output is correct |
24 |
Correct |
2 ms |
512 KB |
Output is correct |
25 |
Correct |
1 ms |
512 KB |
Output is correct |
26 |
Correct |
1 ms |
512 KB |
Output is correct |
27 |
Correct |
1 ms |
512 KB |
Output is correct |
28 |
Correct |
1 ms |
512 KB |
Output is correct |
29 |
Correct |
1 ms |
512 KB |
Output is correct |
30 |
Correct |
1 ms |
512 KB |
Output is correct |
31 |
Correct |
1 ms |
512 KB |
Output is correct |
32 |
Correct |
2 ms |
512 KB |
Output is correct |
33 |
Correct |
1 ms |
512 KB |
Output is correct |
34 |
Correct |
294 ms |
23416 KB |
Output is correct |
35 |
Correct |
276 ms |
24112 KB |
Output is correct |
36 |
Correct |
278 ms |
41392 KB |
Output is correct |
37 |
Correct |
291 ms |
42160 KB |
Output is correct |
38 |
Correct |
280 ms |
42176 KB |
Output is correct |
39 |
Correct |
271 ms |
41392 KB |
Output is correct |
40 |
Correct |
312 ms |
44952 KB |
Output is correct |
41 |
Correct |
276 ms |
42416 KB |
Output is correct |
42 |
Correct |
314 ms |
43824 KB |
Output is correct |
43 |
Correct |
312 ms |
45336 KB |
Output is correct |
44 |
Correct |
311 ms |
45292 KB |
Output is correct |
45 |
Correct |
313 ms |
45268 KB |
Output is correct |
46 |
Correct |
317 ms |
45532 KB |
Output is correct |
47 |
Correct |
303 ms |
44520 KB |
Output is correct |
48 |
Correct |
310 ms |
44264 KB |
Output is correct |
49 |
Correct |
316 ms |
45164 KB |
Output is correct |
50 |
Correct |
320 ms |
44496 KB |
Output is correct |
51 |
Correct |
306 ms |
44508 KB |
Output is correct |
52 |
Correct |
176 ms |
33516 KB |
Output is correct |
53 |
Correct |
188 ms |
33516 KB |
Output is correct |
54 |
Correct |
178 ms |
33632 KB |
Output is correct |
55 |
Correct |
171 ms |
33260 KB |
Output is correct |
56 |
Correct |
312 ms |
45548 KB |
Output is correct |
57 |
Correct |
253 ms |
40396 KB |
Output is correct |
58 |
Correct |
264 ms |
40556 KB |
Output is correct |
59 |
Correct |
250 ms |
40516 KB |
Output is correct |
60 |
Correct |
260 ms |
38452 KB |
Output is correct |
61 |
Correct |
282 ms |
41232 KB |
Output is correct |
62 |
Correct |
263 ms |
40560 KB |
Output is correct |
63 |
Correct |
284 ms |
40940 KB |
Output is correct |
64 |
Correct |
264 ms |
39556 KB |
Output is correct |
65 |
Correct |
278 ms |
41068 KB |
Output is correct |