#include <bits/stdc++.h>
#define FOR(i, x, y) for (int i = x; i < y; i++)
typedef long long ll;
using namespace std;
int a[1000001], b[1000001];
pair<int, int> dp[1000001][2];
void upd(pair<int, int> &X, pair<int, int> &Y) {
X.first = min(X.first, Y.first);
X.second = max(X.second, Y.second);
}
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
int n;
cin >> n;
FOR(i, 1, 2 * n + 1) cin >> a[i];
FOR(i, 1, 2 * n + 1) cin >> b[i];
dp[0][0] = dp[0][1] = {0, 0};
FOR(i, 1, 2 * n + 1) {
dp[i][0] = dp[i][1] = {n + 1, -n - 1};
if (a[i] >= a[i - 1]) upd(dp[i][0], dp[i - 1][0]);
if (a[i] >= b[i - 1]) upd(dp[i][0], dp[i - 1][1]);
if (b[i] >= a[i - 1]) upd(dp[i][1], dp[i - 1][0]);
if (b[i] >= b[i - 1]) upd(dp[i][1], dp[i - 1][1]);
dp[i][1].first++, dp[i][1].second++;
}
string ans = "";
for (int i = 2 * n, curr = INT_MAX; i; i--) {
if (a[i] > curr || dp[i][0].first > n || dp[i][0].second < n) {
if (b[i] > curr || dp[i][1].first > n || dp[i][1].second < n) return cout << -1, 0;
ans += "B", curr = b[i], n--;
} else ans += "A", curr = a[i];
}
reverse(ans.begin(), ans.end());
cout << ans;
return 0;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
4 ms |
384 KB |
Output is correct |
| 2 |
Correct |
4 ms |
384 KB |
Output is correct |
| 3 |
Correct |
5 ms |
384 KB |
Output is correct |
| 4 |
Correct |
5 ms |
512 KB |
Output is correct |
| 5 |
Correct |
6 ms |
512 KB |
Output is correct |
| 6 |
Correct |
6 ms |
512 KB |
Output is correct |
| 7 |
Correct |
6 ms |
512 KB |
Output is correct |
| 8 |
Correct |
6 ms |
512 KB |
Output is correct |
| 9 |
Correct |
6 ms |
512 KB |
Output is correct |
| 10 |
Correct |
6 ms |
512 KB |
Output is correct |
| 11 |
Correct |
6 ms |
512 KB |
Output is correct |
| 12 |
Correct |
6 ms |
512 KB |
Output is correct |
| 13 |
Correct |
6 ms |
512 KB |
Output is correct |
| 14 |
Correct |
6 ms |
512 KB |
Output is correct |
| 15 |
Correct |
6 ms |
512 KB |
Output is correct |
| 16 |
Correct |
6 ms |
512 KB |
Output is correct |
| 17 |
Correct |
6 ms |
512 KB |
Output is correct |
| 18 |
Correct |
6 ms |
512 KB |
Output is correct |
| 19 |
Correct |
6 ms |
512 KB |
Output is correct |
| 20 |
Correct |
5 ms |
512 KB |
Output is correct |
| 21 |
Correct |
5 ms |
512 KB |
Output is correct |
| 22 |
Correct |
5 ms |
512 KB |
Output is correct |
| 23 |
Correct |
5 ms |
512 KB |
Output is correct |
| 24 |
Correct |
6 ms |
512 KB |
Output is correct |
| 25 |
Correct |
5 ms |
640 KB |
Output is correct |
| 26 |
Correct |
7 ms |
512 KB |
Output is correct |
| 27 |
Correct |
5 ms |
512 KB |
Output is correct |
| 28 |
Correct |
5 ms |
512 KB |
Output is correct |
| 29 |
Correct |
5 ms |
512 KB |
Output is correct |
| 30 |
Correct |
6 ms |
512 KB |
Output is correct |
| 31 |
Correct |
5 ms |
512 KB |
Output is correct |
| 32 |
Correct |
5 ms |
512 KB |
Output is correct |
| 33 |
Correct |
5 ms |
512 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
4 ms |
384 KB |
Output is correct |
| 2 |
Correct |
4 ms |
384 KB |
Output is correct |
| 3 |
Correct |
5 ms |
384 KB |
Output is correct |
| 4 |
Correct |
5 ms |
512 KB |
Output is correct |
| 5 |
Correct |
6 ms |
512 KB |
Output is correct |
| 6 |
Correct |
6 ms |
512 KB |
Output is correct |
| 7 |
Correct |
6 ms |
512 KB |
Output is correct |
| 8 |
Correct |
6 ms |
512 KB |
Output is correct |
| 9 |
Correct |
6 ms |
512 KB |
Output is correct |
| 10 |
Correct |
6 ms |
512 KB |
Output is correct |
| 11 |
Correct |
6 ms |
512 KB |
Output is correct |
| 12 |
Correct |
6 ms |
512 KB |
Output is correct |
| 13 |
Correct |
6 ms |
512 KB |
Output is correct |
| 14 |
Correct |
6 ms |
512 KB |
Output is correct |
| 15 |
Correct |
6 ms |
512 KB |
Output is correct |
| 16 |
Correct |
6 ms |
512 KB |
Output is correct |
| 17 |
Correct |
6 ms |
512 KB |
Output is correct |
| 18 |
Correct |
6 ms |
512 KB |
Output is correct |
| 19 |
Correct |
6 ms |
512 KB |
Output is correct |
| 20 |
Correct |
5 ms |
512 KB |
Output is correct |
| 21 |
Correct |
5 ms |
512 KB |
Output is correct |
| 22 |
Correct |
5 ms |
512 KB |
Output is correct |
| 23 |
Correct |
5 ms |
512 KB |
Output is correct |
| 24 |
Correct |
6 ms |
512 KB |
Output is correct |
| 25 |
Correct |
5 ms |
640 KB |
Output is correct |
| 26 |
Correct |
7 ms |
512 KB |
Output is correct |
| 27 |
Correct |
5 ms |
512 KB |
Output is correct |
| 28 |
Correct |
5 ms |
512 KB |
Output is correct |
| 29 |
Correct |
5 ms |
512 KB |
Output is correct |
| 30 |
Correct |
6 ms |
512 KB |
Output is correct |
| 31 |
Correct |
5 ms |
512 KB |
Output is correct |
| 32 |
Correct |
5 ms |
512 KB |
Output is correct |
| 33 |
Correct |
5 ms |
512 KB |
Output is correct |
| 34 |
Correct |
304 ms |
27876 KB |
Output is correct |
| 35 |
Correct |
291 ms |
28468 KB |
Output is correct |
| 36 |
Correct |
304 ms |
27952 KB |
Output is correct |
| 37 |
Correct |
301 ms |
28580 KB |
Output is correct |
| 38 |
Correct |
292 ms |
28648 KB |
Output is correct |
| 39 |
Correct |
287 ms |
24368 KB |
Output is correct |
| 40 |
Correct |
308 ms |
25964 KB |
Output is correct |
| 41 |
Correct |
284 ms |
29104 KB |
Output is correct |
| 42 |
Correct |
302 ms |
25264 KB |
Output is correct |
| 43 |
Correct |
325 ms |
26008 KB |
Output is correct |
| 44 |
Correct |
306 ms |
26092 KB |
Output is correct |
| 45 |
Correct |
315 ms |
26092 KB |
Output is correct |
| 46 |
Correct |
300 ms |
26040 KB |
Output is correct |
| 47 |
Correct |
312 ms |
26092 KB |
Output is correct |
| 48 |
Correct |
290 ms |
30188 KB |
Output is correct |
| 49 |
Correct |
309 ms |
26092 KB |
Output is correct |
| 50 |
Correct |
312 ms |
26092 KB |
Output is correct |
| 51 |
Correct |
320 ms |
26092 KB |
Output is correct |
| 52 |
Correct |
181 ms |
27884 KB |
Output is correct |
| 53 |
Correct |
194 ms |
27812 KB |
Output is correct |
| 54 |
Correct |
177 ms |
27740 KB |
Output is correct |
| 55 |
Correct |
190 ms |
27756 KB |
Output is correct |
| 56 |
Correct |
293 ms |
25964 KB |
Output is correct |
| 57 |
Correct |
261 ms |
27116 KB |
Output is correct |
| 58 |
Correct |
281 ms |
27280 KB |
Output is correct |
| 59 |
Correct |
268 ms |
27156 KB |
Output is correct |
| 60 |
Correct |
250 ms |
25392 KB |
Output is correct |
| 61 |
Correct |
278 ms |
26856 KB |
Output is correct |
| 62 |
Correct |
268 ms |
26476 KB |
Output is correct |
| 63 |
Correct |
282 ms |
26732 KB |
Output is correct |
| 64 |
Correct |
257 ms |
25776 KB |
Output is correct |
| 65 |
Correct |
268 ms |
26460 KB |
Output is correct |
