#include <bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define x first
#define y second
using namespace std;
typedef long long ll;
int mas[5][1000005], ans[1000005], type[1000005];
int main()
{
//freopen("input.txt", "r", stdin);
//freopen("output.txt", "w", stdout);
ios_base::sync_with_stdio(0); cin.tie(0);
int n;
cin >> n;
for (int i = 1; i <= 2 * n; i++) cin >> mas[1][i];
for (int i = 1; i <= 2 * n; i++) cin >> mas[2][i];
for (int i = 1; i <= 2 * n; i++) ans[i] = min(mas[1][i], mas[2][i]);
for (int i = 2; i <= 2 * n; i++)
{
if (ans[i] < ans[i - 1]) ans[i] = max(mas[1][i], mas[2][i]);
if (ans[i] < ans[i - 1]) cout << "-1\n", exit(0);
}
int bal = 0;
for (int i = 1; i <= 2 * n; i++)
if (ans[i] == mas[1][i]) bal++, type[i] = 1;
else bal--, type[i] = 2;
int uk = 1;
while (uk <= 2 * n && bal != 0)
{
if (ans[uk] != min(mas[1][uk], mas[2][uk])) {uk++; continue;}
int cop = uk;
while (cop + 1 <= 2 * n && ans[cop + 1] == min(mas[1][cop + 1], mas[2][cop + 1])
&& max(mas[1][cop + 1], mas[2][cop + 1]) >= max(mas[1][cop], mas[2][cop])
&& min(mas[1][cop + 1], mas[2][cop + 1]) < max(mas[1][cop], mas[2][cop])) cop++;
if (cop == 2 * n || max(mas[1][cop], mas[2][cop]) <= min(mas[1][cop + 1], mas[2][cop + 1])
|| (ans[cop + 1] != min(mas[1][cop + 1], mas[2][cop + 1]) && ans[cop + 1] >= max(mas[1][cop], mas[2][cop])))
{
int mx = 0, del = 0;
for (int i = cop; i >= uk; i--)
{
if (type[i] == 1) del -= 2;
else del += 2;
if (bal > 0) mx = min(mx, del);
else mx = max(mx, del);
}
del = 0;
if (bal > 0 && bal + mx < 0) mx = -bal;
if (bal < 0 && bal + mx > 0) mx = -bal;
if (mx != 0)
{
for (int i = cop; i >= uk; i--)
{
if (type[i] == 1) del -= 2;
else del += 2;
type[i] = 3 - type[i];
if (del == mx) break;
}
}
bal += mx;
}
uk = cop + 1;
}
if (bal != 0) cout << "-1\n", exit(0);
for (int i = 1; i <= 2 * n; i++)
if (type[i] == 1) cout << 'A';
else cout << 'B';
cout << '\n';
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
5 ms |
384 KB |
Output is correct |
| 2 |
Correct |
5 ms |
384 KB |
Output is correct |
| 3 |
Correct |
5 ms |
384 KB |
Output is correct |
| 4 |
Correct |
5 ms |
384 KB |
Output is correct |
| 5 |
Correct |
5 ms |
384 KB |
Output is correct |
| 6 |
Correct |
6 ms |
384 KB |
Output is correct |
| 7 |
Correct |
6 ms |
384 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 |
6 ms |
512 KB |
Output is correct |
| 22 |
Correct |
5 ms |
512 KB |
Output is correct |
| 23 |
Correct |
6 ms |
512 KB |
Output is correct |
| 24 |
Correct |
6 ms |
512 KB |
Output is correct |
| 25 |
Correct |
5 ms |
512 KB |
Output is correct |
| 26 |
Correct |
6 ms |
512 KB |
Output is correct |
| 27 |
Correct |
6 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 |
5 ms |
512 KB |
Output is correct |
| 31 |
Correct |
6 ms |
512 KB |
Output is correct |
| 32 |
Correct |
5 ms |
512 KB |
Output is correct |
| 33 |
Correct |
6 ms |
512 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
5 ms |
384 KB |
Output is correct |
| 2 |
Correct |
5 ms |
384 KB |
Output is correct |
| 3 |
Correct |
5 ms |
384 KB |
Output is correct |
| 4 |
Correct |
5 ms |
384 KB |
Output is correct |
| 5 |
Correct |
5 ms |
384 KB |
Output is correct |
| 6 |
Correct |
6 ms |
384 KB |
Output is correct |
| 7 |
Correct |
6 ms |
384 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 |
6 ms |
512 KB |
Output is correct |
| 22 |
Correct |
5 ms |
512 KB |
Output is correct |
| 23 |
Correct |
6 ms |
512 KB |
Output is correct |
| 24 |
Correct |
6 ms |
512 KB |
Output is correct |
| 25 |
Correct |
5 ms |
512 KB |
Output is correct |
| 26 |
Correct |
6 ms |
512 KB |
Output is correct |
| 27 |
Correct |
6 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 |
5 ms |
512 KB |
Output is correct |
| 31 |
Correct |
6 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 |
269 ms |
30840 KB |
Output is correct |
| 35 |
Correct |
319 ms |
33528 KB |
Output is correct |
| 36 |
Correct |
317 ms |
33144 KB |
Output is correct |
| 37 |
Correct |
304 ms |
33560 KB |
Output is correct |
| 38 |
Correct |
317 ms |
33788 KB |
Output is correct |
| 39 |
Correct |
304 ms |
33272 KB |
Output is correct |
| 40 |
Correct |
321 ms |
32760 KB |
Output is correct |
| 41 |
Correct |
288 ms |
33784 KB |
Output is correct |
| 42 |
Correct |
298 ms |
32640 KB |
Output is correct |
| 43 |
Correct |
322 ms |
27000 KB |
Output is correct |
| 44 |
Correct |
335 ms |
27000 KB |
Output is correct |
| 45 |
Correct |
329 ms |
27000 KB |
Output is correct |
| 46 |
Correct |
431 ms |
27000 KB |
Output is correct |
| 47 |
Correct |
312 ms |
33272 KB |
Output is correct |
| 48 |
Correct |
301 ms |
34296 KB |
Output is correct |
| 49 |
Correct |
329 ms |
32244 KB |
Output is correct |
| 50 |
Correct |
341 ms |
33464 KB |
Output is correct |
| 51 |
Correct |
321 ms |
33272 KB |
Output is correct |
| 52 |
Correct |
189 ms |
24568 KB |
Output is correct |
| 53 |
Correct |
204 ms |
24568 KB |
Output is correct |
| 54 |
Correct |
186 ms |
24776 KB |
Output is correct |
| 55 |
Correct |
182 ms |
24312 KB |
Output is correct |
| 56 |
Correct |
324 ms |
36600 KB |
Output is correct |
| 57 |
Correct |
273 ms |
31480 KB |
Output is correct |
| 58 |
Correct |
272 ms |
31548 KB |
Output is correct |
| 59 |
Correct |
264 ms |
31420 KB |
Output is correct |
| 60 |
Correct |
250 ms |
30048 KB |
Output is correct |
| 61 |
Correct |
273 ms |
31992 KB |
Output is correct |
| 62 |
Correct |
278 ms |
31612 KB |
Output is correct |
| 63 |
Correct |
300 ms |
32120 KB |
Output is correct |
| 64 |
Correct |
266 ms |
30968 KB |
Output is correct |
| 65 |
Correct |
283 ms |
31992 KB |
Output is correct |
