#include <bits/stdc++.h>
using namespace std;
const int N = 1e6 + 7, INF = 1e9 + 10;
int n, a[N][2];
int mn[N][2], mx[N][2];
int main() {
#ifdef LOCAL
freopen("input.txt", "r", stdin);
#endif
ios::sync_with_stdio(false);
cin.tie(0);
cin >> n;
a[0][0] = a[0][1] = 0;
for (int i = 0; i < 2; i++) {
for (int j = 1; j <= 2 * n; j++) cin >> a[j][i];
}
for (int i = 1; i <= 2 * n; i++) {
for (int j = 0; j < 2; j++) {
mn[i][j] = INF;
mx[i][j] = -INF;
}
}
for (int i = 0; i < 2; i++) mn[0][i] = mx[0][i] = 0;
for (int i = 1; i <= 2 * n; i++) {
for (int j = 0; j < 2; j++) {
for (int k = 0; k < 2; k++) {
if (a[i - 1][k] <= a[i][j]) {
if (mn[i - 1][k] != INF) mn[i][j] = min(mn[i][j], mn[i - 1][k] + j);
if (mx[i - 1][k] != -INF) mx[i][j] = max(mx[i][j], mx[i - 1][k] + j);
}
}
}
}
int j = -1;
for (int i = 0; i < 2; i++) {
if (mn[2 * n][i] <= n && n <= mx[2 * n][i]) {
j = i;
break;
}
}
if (j == -1) {
cout << -1;
return 0;
}
string ans = "";
int cur = n;
for (int i = 2 * n; i > 0; i--) {
cur -= j;
ans.push_back('A' + j);
int jj = -1;
for (int k = 0; k < 2; k++) {
if (mn[i - 1][k] <= cur && cur <= mx[i - 1][k] && a[i - 1][k] <= a[i][j]) {
jj = k;
break;
}
}
j = jj;
}
reverse(ans.begin(), ans.end());
cout << ans << endl;
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
364 KB |
Output is correct |
2 |
Correct |
1 ms |
364 KB |
Output is correct |
3 |
Correct |
0 ms |
364 KB |
Output is correct |
4 |
Correct |
1 ms |
364 KB |
Output is correct |
5 |
Correct |
2 ms |
492 KB |
Output is correct |
6 |
Correct |
1 ms |
492 KB |
Output is correct |
7 |
Correct |
1 ms |
492 KB |
Output is correct |
8 |
Correct |
1 ms |
492 KB |
Output is correct |
9 |
Correct |
1 ms |
492 KB |
Output is correct |
10 |
Correct |
1 ms |
492 KB |
Output is correct |
11 |
Correct |
1 ms |
492 KB |
Output is correct |
12 |
Correct |
2 ms |
492 KB |
Output is correct |
13 |
Correct |
2 ms |
492 KB |
Output is correct |
14 |
Correct |
2 ms |
492 KB |
Output is correct |
15 |
Correct |
2 ms |
492 KB |
Output is correct |
16 |
Correct |
1 ms |
492 KB |
Output is correct |
17 |
Correct |
2 ms |
492 KB |
Output is correct |
18 |
Correct |
2 ms |
492 KB |
Output is correct |
19 |
Correct |
2 ms |
492 KB |
Output is correct |
20 |
Correct |
1 ms |
492 KB |
Output is correct |
21 |
Correct |
1 ms |
492 KB |
Output is correct |
22 |
Correct |
1 ms |
492 KB |
Output is correct |
23 |
Correct |
1 ms |
492 KB |
Output is correct |
24 |
Correct |
2 ms |
492 KB |
Output is correct |
25 |
Correct |
1 ms |
512 KB |
Output is correct |
26 |
Correct |
1 ms |
492 KB |
Output is correct |
27 |
Correct |
1 ms |
492 KB |
Output is correct |
28 |
Correct |
1 ms |
492 KB |
Output is correct |
29 |
Correct |
1 ms |
492 KB |
Output is correct |
30 |
Correct |
1 ms |
492 KB |
Output is correct |
31 |
Correct |
1 ms |
492 KB |
Output is correct |
32 |
Correct |
1 ms |
492 KB |
Output is correct |
33 |
Correct |
1 ms |
492 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
364 KB |
Output is correct |
2 |
Correct |
1 ms |
364 KB |
Output is correct |
3 |
Correct |
0 ms |
364 KB |
Output is correct |
4 |
Correct |
1 ms |
364 KB |
Output is correct |
5 |
Correct |
2 ms |
492 KB |
Output is correct |
6 |
Correct |
1 ms |
492 KB |
Output is correct |
7 |
Correct |
1 ms |
492 KB |
Output is correct |
8 |
Correct |
1 ms |
492 KB |
Output is correct |
9 |
Correct |
1 ms |
492 KB |
Output is correct |
10 |
Correct |
1 ms |
492 KB |
Output is correct |
11 |
Correct |
1 ms |
492 KB |
Output is correct |
12 |
Correct |
2 ms |
492 KB |
Output is correct |
13 |
Correct |
2 ms |
492 KB |
Output is correct |
14 |
Correct |
2 ms |
492 KB |
Output is correct |
15 |
Correct |
2 ms |
492 KB |
Output is correct |
16 |
Correct |
1 ms |
492 KB |
Output is correct |
17 |
Correct |
2 ms |
492 KB |
Output is correct |
18 |
Correct |
2 ms |
492 KB |
Output is correct |
19 |
Correct |
2 ms |
492 KB |
Output is correct |
20 |
Correct |
1 ms |
492 KB |
Output is correct |
21 |
Correct |
1 ms |
492 KB |
Output is correct |
22 |
Correct |
1 ms |
492 KB |
Output is correct |
23 |
Correct |
1 ms |
492 KB |
Output is correct |
24 |
Correct |
2 ms |
492 KB |
Output is correct |
25 |
Correct |
1 ms |
512 KB |
Output is correct |
26 |
Correct |
1 ms |
492 KB |
Output is correct |
27 |
Correct |
1 ms |
492 KB |
Output is correct |
28 |
Correct |
1 ms |
492 KB |
Output is correct |
29 |
Correct |
1 ms |
492 KB |
Output is correct |
30 |
Correct |
1 ms |
492 KB |
Output is correct |
31 |
Correct |
1 ms |
492 KB |
Output is correct |
32 |
Correct |
1 ms |
492 KB |
Output is correct |
33 |
Correct |
1 ms |
492 KB |
Output is correct |
34 |
Correct |
262 ms |
41324 KB |
Output is correct |
35 |
Correct |
262 ms |
42020 KB |
Output is correct |
36 |
Correct |
253 ms |
41508 KB |
Output is correct |
37 |
Correct |
263 ms |
42276 KB |
Output is correct |
38 |
Correct |
243 ms |
42276 KB |
Output is correct |
39 |
Correct |
241 ms |
41412 KB |
Output is correct |
40 |
Correct |
258 ms |
44768 KB |
Output is correct |
41 |
Correct |
248 ms |
42404 KB |
Output is correct |
42 |
Correct |
267 ms |
43940 KB |
Output is correct |
43 |
Correct |
277 ms |
45232 KB |
Output is correct |
44 |
Correct |
282 ms |
45536 KB |
Output is correct |
45 |
Correct |
279 ms |
45280 KB |
Output is correct |
46 |
Correct |
269 ms |
45536 KB |
Output is correct |
47 |
Correct |
261 ms |
44768 KB |
Output is correct |
48 |
Correct |
263 ms |
44232 KB |
Output is correct |
49 |
Correct |
264 ms |
45024 KB |
Output is correct |
50 |
Correct |
276 ms |
44496 KB |
Output is correct |
51 |
Correct |
274 ms |
44636 KB |
Output is correct |
52 |
Correct |
198 ms |
33632 KB |
Output is correct |
53 |
Correct |
199 ms |
33672 KB |
Output is correct |
54 |
Correct |
185 ms |
33632 KB |
Output is correct |
55 |
Correct |
184 ms |
33248 KB |
Output is correct |
56 |
Correct |
267 ms |
45664 KB |
Output is correct |
57 |
Correct |
238 ms |
40416 KB |
Output is correct |
58 |
Correct |
228 ms |
40672 KB |
Output is correct |
59 |
Correct |
246 ms |
40672 KB |
Output is correct |
60 |
Correct |
215 ms |
38564 KB |
Output is correct |
61 |
Correct |
232 ms |
41056 KB |
Output is correct |
62 |
Correct |
243 ms |
40376 KB |
Output is correct |
63 |
Correct |
257 ms |
41056 KB |
Output is correct |
64 |
Correct |
224 ms |
39716 KB |
Output is correct |
65 |
Correct |
234 ms |
41004 KB |
Output is correct |