///
/// Oh? You're approaching me?
///
#include <bits/stdc++.h>
#define Loop(x,l,r) for(ll x = ll(l); x < ll(r); ++x)
#define LoopR(x,l,r) for(ll x = ll(r)-1; x >= ll(l); --x)
#define Kill(x) exit((cout << (x) << '\n', 0))
typedef long long ll;
typedef std::pair<int,int> pii;
typedef std::pair<ll,ll> pll;
using namespace std;
const int N = 1'000'010;
int dpal[N], dpar[N];
int dpbl[N], dpbr[N];
int a[N], b[N];
int n;
int main()
{
cin.tie(0) -> sync_with_stdio(false);
cin >> n; n*=2;
//Loop(i,0,n) cout << (a[i]=rand()%100) << ' '; cout << '\n';//cin >> a[i];
//Loop(i,0,n) cout << (b[i]=rand()%100) << ' '; cout << '\n';//cin >> b[i];
Loop(i,0,n) cin >> a[i];
Loop(i,0,n) cin >> b[i];
dpal[0] = 1; dpar[0] = 2;
dpbl[0] = 0; dpbr[0] = 1;
Loop(i,1,n){
int l, r;
l = min(a[i-1]<=a[i]?dpal[i-1]:N, b[i-1]<=a[i]?dpbl[i-1]:N);
r = max(a[i-1]<=a[i]?dpar[i-1]:0, b[i-1]<=a[i]?dpbr[i-1]:0);
if(r) {dpal[i] = l+1; dpar[i] = r+1;} else {dpal[i] = N; dpar[i] = 0;}
l = min(a[i-1]<=b[i]?dpal[i-1]:N, b[i-1]<=b[i]?dpbl[i-1]:N);
r = max(a[i-1]<=b[i]?dpar[i-1]:0, b[i-1]<=b[i]?dpbr[i-1]:0);
dpbl[i] = l; dpbr[i] = r;
if(!(!dpar[i] || !dpbr[i] || max(dpal[i], dpbl[i]) <= min(dpar[i], dpbr[i]))){
cout <<"err\n";
}
// cout << dpal[i] << ' ' << dpar[i] << '\n';
// cout << dpbl[i] << ' ' << dpbr[i] << '\n';
// cout << '\n';
}
if(!(dpal[n-1] <= n/2 && n/2 < dpar[n-1]) && !(dpbl[n-1] <= n/2 && n/2 < dpbr[n-1]))
Kill(-1);
int k=n/2, lst=1e9+10;
string ans;
LoopR(i,0,n){
if(dpal[i] <= k && k < dpar[i] && a[i]<=lst){
ans.push_back('A');
lst=a[i];
--k;
} else {
ans.push_back('B');
lst=b[i];
}
}
reverse(ans.begin(), ans.end());
cout << ans << '\n';
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
332 KB |
Output is correct |
| 2 |
Correct |
0 ms |
332 KB |
Output is correct |
| 3 |
Correct |
1 ms |
332 KB |
Output is correct |
| 4 |
Correct |
0 ms |
332 KB |
Output is correct |
| 5 |
Correct |
2 ms |
336 KB |
Output is correct |
| 6 |
Correct |
1 ms |
388 KB |
Output is correct |
| 7 |
Correct |
1 ms |
460 KB |
Output is correct |
| 8 |
Correct |
1 ms |
460 KB |
Output is correct |
| 9 |
Correct |
1 ms |
460 KB |
Output is correct |
| 10 |
Correct |
1 ms |
440 KB |
Output is correct |
| 11 |
Correct |
2 ms |
460 KB |
Output is correct |
| 12 |
Correct |
1 ms |
460 KB |
Output is correct |
| 13 |
Correct |
2 ms |
580 KB |
Output is correct |
| 14 |
Correct |
2 ms |
460 KB |
Output is correct |
| 15 |
Correct |
1 ms |
460 KB |
Output is correct |
| 16 |
Correct |
2 ms |
424 KB |
Output is correct |
| 17 |
Correct |
1 ms |
540 KB |
Output is correct |
| 18 |
Correct |
1 ms |
516 KB |
Output is correct |
| 19 |
Correct |
2 ms |
536 KB |
Output is correct |
| 20 |
Correct |
1 ms |
460 KB |
Output is correct |
| 21 |
Correct |
1 ms |
460 KB |
Output is correct |
| 22 |
Correct |
1 ms |
460 KB |
Output is correct |
| 23 |
Correct |
1 ms |
464 KB |
Output is correct |
| 24 |
Correct |
1 ms |
460 KB |
Output is correct |
| 25 |
Correct |
1 ms |
460 KB |
Output is correct |
| 26 |
Correct |
1 ms |
452 KB |
Output is correct |
| 27 |
Correct |
1 ms |
484 KB |
Output is correct |
| 28 |
Correct |
1 ms |
460 KB |
Output is correct |
| 29 |
Correct |
1 ms |
460 KB |
Output is correct |
| 30 |
Correct |
1 ms |
456 KB |
Output is correct |
| 31 |
Correct |
1 ms |
460 KB |
Output is correct |
| 32 |
Correct |
1 ms |
464 KB |
Output is correct |
| 33 |
Correct |
1 ms |
448 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
332 KB |
Output is correct |
| 2 |
Correct |
0 ms |
332 KB |
Output is correct |
| 3 |
Correct |
1 ms |
332 KB |
Output is correct |
| 4 |
Correct |
0 ms |
332 KB |
Output is correct |
| 5 |
Correct |
2 ms |
336 KB |
Output is correct |
| 6 |
Correct |
1 ms |
388 KB |
Output is correct |
| 7 |
Correct |
1 ms |
460 KB |
Output is correct |
| 8 |
Correct |
1 ms |
460 KB |
Output is correct |
| 9 |
Correct |
1 ms |
460 KB |
Output is correct |
| 10 |
Correct |
1 ms |
440 KB |
Output is correct |
| 11 |
Correct |
2 ms |
460 KB |
Output is correct |
| 12 |
Correct |
1 ms |
460 KB |
Output is correct |
| 13 |
Correct |
2 ms |
580 KB |
Output is correct |
| 14 |
Correct |
2 ms |
460 KB |
Output is correct |
| 15 |
Correct |
1 ms |
460 KB |
Output is correct |
| 16 |
Correct |
2 ms |
424 KB |
Output is correct |
| 17 |
Correct |
1 ms |
540 KB |
Output is correct |
| 18 |
Correct |
1 ms |
516 KB |
Output is correct |
| 19 |
Correct |
2 ms |
536 KB |
Output is correct |
| 20 |
Correct |
1 ms |
460 KB |
Output is correct |
| 21 |
Correct |
1 ms |
460 KB |
Output is correct |
| 22 |
Correct |
1 ms |
460 KB |
Output is correct |
| 23 |
Correct |
1 ms |
464 KB |
Output is correct |
| 24 |
Correct |
1 ms |
460 KB |
Output is correct |
| 25 |
Correct |
1 ms |
460 KB |
Output is correct |
| 26 |
Correct |
1 ms |
452 KB |
Output is correct |
| 27 |
Correct |
1 ms |
484 KB |
Output is correct |
| 28 |
Correct |
1 ms |
460 KB |
Output is correct |
| 29 |
Correct |
1 ms |
460 KB |
Output is correct |
| 30 |
Correct |
1 ms |
456 KB |
Output is correct |
| 31 |
Correct |
1 ms |
460 KB |
Output is correct |
| 32 |
Correct |
1 ms |
464 KB |
Output is correct |
| 33 |
Correct |
1 ms |
448 KB |
Output is correct |
| 34 |
Correct |
202 ms |
42300 KB |
Output is correct |
| 35 |
Correct |
205 ms |
42132 KB |
Output is correct |
| 36 |
Correct |
214 ms |
41312 KB |
Output is correct |
| 37 |
Correct |
212 ms |
42100 KB |
Output is correct |
| 38 |
Correct |
194 ms |
42060 KB |
Output is correct |
| 39 |
Correct |
186 ms |
41328 KB |
Output is correct |
| 40 |
Correct |
206 ms |
44748 KB |
Output is correct |
| 41 |
Correct |
198 ms |
42288 KB |
Output is correct |
| 42 |
Correct |
221 ms |
43692 KB |
Output is correct |
| 43 |
Correct |
215 ms |
45232 KB |
Output is correct |
| 44 |
Correct |
223 ms |
45236 KB |
Output is correct |
| 45 |
Correct |
232 ms |
45140 KB |
Output is correct |
| 46 |
Correct |
211 ms |
45180 KB |
Output is correct |
| 47 |
Correct |
210 ms |
44216 KB |
Output is correct |
| 48 |
Correct |
225 ms |
44012 KB |
Output is correct |
| 49 |
Correct |
243 ms |
44728 KB |
Output is correct |
| 50 |
Correct |
213 ms |
44352 KB |
Output is correct |
| 51 |
Correct |
240 ms |
44344 KB |
Output is correct |
| 52 |
Correct |
172 ms |
33432 KB |
Output is correct |
| 53 |
Correct |
151 ms |
33484 KB |
Output is correct |
| 54 |
Correct |
156 ms |
33420 KB |
Output is correct |
| 55 |
Correct |
139 ms |
33208 KB |
Output is correct |
| 56 |
Correct |
214 ms |
45228 KB |
Output is correct |
| 57 |
Correct |
186 ms |
40392 KB |
Output is correct |
| 58 |
Correct |
183 ms |
40344 KB |
Output is correct |
| 59 |
Correct |
179 ms |
40376 KB |
Output is correct |
| 60 |
Correct |
169 ms |
38344 KB |
Output is correct |
| 61 |
Correct |
194 ms |
40816 KB |
Output is correct |
| 62 |
Correct |
192 ms |
40304 KB |
Output is correct |
| 63 |
Correct |
186 ms |
41084 KB |
Output is correct |
| 64 |
Correct |
181 ms |
39580 KB |
Output is correct |
| 65 |
Correct |
190 ms |
40880 KB |
Output is correct |
