#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define ld double
#define sz(x) (int)x.size()
#define all(x) x.begin(),x.end()
#define pb emplace_back
#define X first
#define Y second
const int N = 1e6 + 5;
typedef pair<int,int> ii;
int a[N][2];
int l[N][2];
int r[N][2];
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
int n; cin >> n; n += n;
for(int i = 1 ; i <= n ; ++i) cin >> a[i][0];
for(int i = 1 ; i <= n ; ++i) cin >> a[i][1];
for(int i = 1 ; i <= n ; ++i) {
l[i][0] = l[i][1] = 1e9;
r[i][0] = r[i][1] = -1e9;
for(int x = 0 ; x < 2 ; ++x)
for(int y = 0 ; y < 2 ; ++y) if (a[i - 1][x] <= a[i][y]) {
l[i][y] = min(l[i][y],l[i - 1][x] + (y == 0));
r[i][y] = max(r[i][y],r[i - 1][x] + (y == 0));
}
}
int S = 0;
int v = n / 2;
if (l[n][0] > v) S = 1;
if (r[n][0] < v) S = 1;
if (l[n][S] > v) return cout << "-1",0;
if (r[n][S] < v) return cout << "-1",0;
string res = "";
for(int i = n ; i >= 1 ; --i) {
if (S == 0) res += 'A', --v;
if (S == 1) res += 'B';
for(int x = 0 ; x < 2 ; ++x) if (a[i - 1][x] <= a[i][S]) {
if (l[i - 1][x] > v) continue;
if (r[i - 1][x] < v) continue;
S = x;
break;
}
}
reverse(all(res));
cout << res << endl;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 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 |
4 ms |
384 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 |
540 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 |
6 ms |
512 KB |
Output is correct |
| 21 |
Correct |
5 ms |
512 KB |
Output is correct |
| 22 |
Correct |
6 ms |
640 KB |
Output is correct |
| 23 |
Correct |
5 ms |
640 KB |
Output is correct |
| 24 |
Correct |
6 ms |
504 KB |
Output is correct |
| 25 |
Correct |
5 ms |
512 KB |
Output is correct |
| 26 |
Correct |
5 ms |
512 KB |
Output is correct |
| 27 |
Correct |
5 ms |
640 KB |
Output is correct |
| 28 |
Correct |
5 ms |
512 KB |
Output is correct |
| 29 |
Correct |
5 ms |
512 KB |
Output is correct |
| 30 |
Correct |
5 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 |
6 ms |
512 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 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 |
4 ms |
384 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 |
540 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 |
6 ms |
512 KB |
Output is correct |
| 21 |
Correct |
5 ms |
512 KB |
Output is correct |
| 22 |
Correct |
6 ms |
640 KB |
Output is correct |
| 23 |
Correct |
5 ms |
640 KB |
Output is correct |
| 24 |
Correct |
6 ms |
504 KB |
Output is correct |
| 25 |
Correct |
5 ms |
512 KB |
Output is correct |
| 26 |
Correct |
5 ms |
512 KB |
Output is correct |
| 27 |
Correct |
5 ms |
640 KB |
Output is correct |
| 28 |
Correct |
5 ms |
512 KB |
Output is correct |
| 29 |
Correct |
5 ms |
512 KB |
Output is correct |
| 30 |
Correct |
5 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 |
6 ms |
512 KB |
Output is correct |
| 34 |
Correct |
297 ms |
24312 KB |
Output is correct |
| 35 |
Correct |
303 ms |
24240 KB |
Output is correct |
| 36 |
Correct |
302 ms |
23856 KB |
Output is correct |
| 37 |
Correct |
289 ms |
24240 KB |
Output is correct |
| 38 |
Correct |
287 ms |
24240 KB |
Output is correct |
| 39 |
Correct |
281 ms |
25908 KB |
Output is correct |
| 40 |
Correct |
308 ms |
27408 KB |
Output is correct |
| 41 |
Correct |
284 ms |
24752 KB |
Output is correct |
| 42 |
Correct |
303 ms |
26776 KB |
Output is correct |
| 43 |
Correct |
322 ms |
26092 KB |
Output is correct |
| 44 |
Correct |
320 ms |
26092 KB |
Output is correct |
| 45 |
Correct |
330 ms |
26092 KB |
Output is correct |
| 46 |
Correct |
294 ms |
25964 KB |
Output is correct |
| 47 |
Correct |
292 ms |
25964 KB |
Output is correct |
| 48 |
Correct |
311 ms |
25964 KB |
Output is correct |
| 49 |
Correct |
303 ms |
25964 KB |
Output is correct |
| 50 |
Correct |
301 ms |
27500 KB |
Output is correct |
| 51 |
Correct |
310 ms |
27500 KB |
Output is correct |
| 52 |
Correct |
180 ms |
26732 KB |
Output is correct |
| 53 |
Correct |
177 ms |
26732 KB |
Output is correct |
| 54 |
Correct |
166 ms |
26732 KB |
Output is correct |
| 55 |
Correct |
178 ms |
26732 KB |
Output is correct |
| 56 |
Correct |
307 ms |
26860 KB |
Output is correct |
| 57 |
Correct |
260 ms |
26476 KB |
Output is correct |
| 58 |
Correct |
264 ms |
26732 KB |
Output is correct |
| 59 |
Correct |
270 ms |
26732 KB |
Output is correct |
| 60 |
Correct |
245 ms |
25008 KB |
Output is correct |
| 61 |
Correct |
255 ms |
26604 KB |
Output is correct |
| 62 |
Correct |
256 ms |
26288 KB |
Output is correct |
| 63 |
Correct |
273 ms |
26732 KB |
Output is correct |
| 64 |
Correct |
243 ms |
25776 KB |
Output is correct |
| 65 |
Correct |
268 ms |
26604 KB |
Output is correct |
