#include <bits/stdc++.h>
#define ll long long
#define f first
#define s second
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pb push_back
#define epb emplace_back
#define ull unsigned ll
using namespace std;
pii merg(pii a, pii b){
return {min(a.f, b.f), max(a.s, b.s)};
}
int main(){
#ifndef ONLINE_JUDGE
//freopen("in.txt", "r", stdin);
//freopen("out.txt", "w", stdout);
#endif // ONLINE_JUDGE
int n; cin >> n;
int a[2 * n + 1][2];
for(int j = 0; j < 2; j++){
for(int i = 1; i <= 2 * n; i++)
cin >> a[i][j];
}
pii dp[2 * n + 1][2];
dp[1][0] = {0, 0};
dp[1][1] = {1, 1};
for(int i = 2; i <= 2 * n; i++){
for(int j = 0; j < 2; j++){
pii x = {1e9, -1e9};
pii y = {1e9, -1e9};
if(a[i][j] >= a[i - 1][0]){
x = {dp[i - 1][0].f + j, dp[i - 1][0].s + j};
}
if(a[i][j] >= a[i - 1][1]){
y = {dp[i - 1][1].f + j, dp[i - 1][1].s + j};
}
dp[i][j] = merg(x, y);
}
}
/*for(int i = 1; i <= 2 * n; i++){
for(int j = 0; j < 2; j++){
cout << dp[i][j].f << ' ' << dp[i][j].s << " ";
}
cout << "\n";
}*/
int last;
int cur = n;
string ans = "";
if(dp[2 * n][0].f > n || dp[2 * n][0].s < n){
if(dp[2 * n][1].f > n || dp[2 * n][1].s < n){
cout << -1 << "\n";
return 0;
}
last = 1;
cur--;
ans += 'B';
}
else{
last = 0;
ans += 'A';
}
for(int i = 2 * n - 1; i >= 1; i--){
for(int j = 0; j < 2; j++){
if(a[i][j] > a[i + 1][last]) continue;
if(dp[i][j].f <= cur && dp[i][j].s >= cur){
last = j;
cur -= j;
break;
}
}
if(last) ans += 'B';
else ans += 'A';
}
reverse(ans.begin(), ans.end());
cout << ans;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
212 KB |
Output is correct |
2 |
Correct |
1 ms |
212 KB |
Output is correct |
3 |
Correct |
1 ms |
212 KB |
Output is correct |
4 |
Correct |
0 ms |
212 KB |
Output is correct |
5 |
Correct |
3 ms |
340 KB |
Output is correct |
6 |
Correct |
4 ms |
440 KB |
Output is correct |
7 |
Correct |
3 ms |
440 KB |
Output is correct |
8 |
Correct |
3 ms |
388 KB |
Output is correct |
9 |
Correct |
3 ms |
468 KB |
Output is correct |
10 |
Correct |
3 ms |
340 KB |
Output is correct |
11 |
Correct |
3 ms |
468 KB |
Output is correct |
12 |
Correct |
3 ms |
440 KB |
Output is correct |
13 |
Correct |
4 ms |
400 KB |
Output is correct |
14 |
Correct |
3 ms |
372 KB |
Output is correct |
15 |
Correct |
4 ms |
468 KB |
Output is correct |
16 |
Correct |
4 ms |
396 KB |
Output is correct |
17 |
Correct |
3 ms |
468 KB |
Output is correct |
18 |
Correct |
3 ms |
444 KB |
Output is correct |
19 |
Correct |
3 ms |
468 KB |
Output is correct |
20 |
Correct |
2 ms |
436 KB |
Output is correct |
21 |
Correct |
2 ms |
340 KB |
Output is correct |
22 |
Correct |
2 ms |
340 KB |
Output is correct |
23 |
Correct |
2 ms |
312 KB |
Output is correct |
24 |
Correct |
4 ms |
436 KB |
Output is correct |
25 |
Correct |
2 ms |
340 KB |
Output is correct |
26 |
Correct |
2 ms |
340 KB |
Output is correct |
27 |
Correct |
2 ms |
340 KB |
Output is correct |
28 |
Correct |
3 ms |
352 KB |
Output is correct |
29 |
Correct |
2 ms |
340 KB |
Output is correct |
30 |
Correct |
2 ms |
340 KB |
Output is correct |
31 |
Correct |
2 ms |
340 KB |
Output is correct |
32 |
Correct |
2 ms |
356 KB |
Output is correct |
33 |
Correct |
3 ms |
436 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
212 KB |
Output is correct |
2 |
Correct |
1 ms |
212 KB |
Output is correct |
3 |
Correct |
1 ms |
212 KB |
Output is correct |
4 |
Correct |
0 ms |
212 KB |
Output is correct |
5 |
Correct |
3 ms |
340 KB |
Output is correct |
6 |
Correct |
4 ms |
440 KB |
Output is correct |
7 |
Correct |
3 ms |
440 KB |
Output is correct |
8 |
Correct |
3 ms |
388 KB |
Output is correct |
9 |
Correct |
3 ms |
468 KB |
Output is correct |
10 |
Correct |
3 ms |
340 KB |
Output is correct |
11 |
Correct |
3 ms |
468 KB |
Output is correct |
12 |
Correct |
3 ms |
440 KB |
Output is correct |
13 |
Correct |
4 ms |
400 KB |
Output is correct |
14 |
Correct |
3 ms |
372 KB |
Output is correct |
15 |
Correct |
4 ms |
468 KB |
Output is correct |
16 |
Correct |
4 ms |
396 KB |
Output is correct |
17 |
Correct |
3 ms |
468 KB |
Output is correct |
18 |
Correct |
3 ms |
444 KB |
Output is correct |
19 |
Correct |
3 ms |
468 KB |
Output is correct |
20 |
Correct |
2 ms |
436 KB |
Output is correct |
21 |
Correct |
2 ms |
340 KB |
Output is correct |
22 |
Correct |
2 ms |
340 KB |
Output is correct |
23 |
Correct |
2 ms |
312 KB |
Output is correct |
24 |
Correct |
4 ms |
436 KB |
Output is correct |
25 |
Correct |
2 ms |
340 KB |
Output is correct |
26 |
Correct |
2 ms |
340 KB |
Output is correct |
27 |
Correct |
2 ms |
340 KB |
Output is correct |
28 |
Correct |
3 ms |
352 KB |
Output is correct |
29 |
Correct |
2 ms |
340 KB |
Output is correct |
30 |
Correct |
2 ms |
340 KB |
Output is correct |
31 |
Correct |
2 ms |
340 KB |
Output is correct |
32 |
Correct |
2 ms |
356 KB |
Output is correct |
33 |
Correct |
3 ms |
436 KB |
Output is correct |
34 |
Correct |
711 ms |
42424 KB |
Output is correct |
35 |
Correct |
695 ms |
41912 KB |
Output is correct |
36 |
Correct |
688 ms |
41384 KB |
Output is correct |
37 |
Correct |
667 ms |
42128 KB |
Output is correct |
38 |
Correct |
673 ms |
42168 KB |
Output is correct |
39 |
Correct |
634 ms |
41312 KB |
Output is correct |
40 |
Correct |
696 ms |
44640 KB |
Output is correct |
41 |
Correct |
651 ms |
42212 KB |
Output is correct |
42 |
Correct |
697 ms |
43604 KB |
Output is correct |
43 |
Correct |
716 ms |
45236 KB |
Output is correct |
44 |
Correct |
724 ms |
45220 KB |
Output is correct |
45 |
Correct |
747 ms |
45240 KB |
Output is correct |
46 |
Correct |
725 ms |
45352 KB |
Output is correct |
47 |
Correct |
686 ms |
44332 KB |
Output is correct |
48 |
Correct |
674 ms |
44076 KB |
Output is correct |
49 |
Correct |
696 ms |
44952 KB |
Output is correct |
50 |
Correct |
692 ms |
44752 KB |
Output is correct |
51 |
Correct |
692 ms |
44352 KB |
Output is correct |
52 |
Correct |
398 ms |
33420 KB |
Output is correct |
53 |
Correct |
396 ms |
33420 KB |
Output is correct |
54 |
Correct |
383 ms |
33472 KB |
Output is correct |
55 |
Correct |
367 ms |
33216 KB |
Output is correct |
56 |
Correct |
713 ms |
45376 KB |
Output is correct |
57 |
Correct |
571 ms |
40316 KB |
Output is correct |
58 |
Correct |
575 ms |
40384 KB |
Output is correct |
59 |
Correct |
619 ms |
40360 KB |
Output is correct |
60 |
Correct |
552 ms |
38404 KB |
Output is correct |
61 |
Correct |
599 ms |
40836 KB |
Output is correct |
62 |
Correct |
581 ms |
40476 KB |
Output is correct |
63 |
Correct |
618 ms |
40976 KB |
Output is correct |
64 |
Correct |
606 ms |
39556 KB |
Output is correct |
65 |
Correct |
602 ms |
40880 KB |
Output is correct |