#ifndef _DEBUG
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#endif
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define all(x) (x).begin(), (x).end()
template <class T>
istream &operator>>(istream &in, vector<T> &a)
{
for (T &x : a)
in >> x;
return in;
}
template <class T>
ostream &operator<<(ostream &out, const vector<T> &a)
{
for (T x : a)
out << x << " ";
out << "\n";
return out;
}
struct Range
{
int low, high;
Range operator+(Range other)
{
if (low < 0)
return other;
if (other.low < 0)
return *this;
assert(max(low, other.low) <= min(high, other.high) + 1);
return {min(low, other.low), max(high, other.high)};
}
Range operator+(int x)
{
return {low + x, high + x};
}
};
signed main()
{
cin.tie(0);
ios_base::sync_with_stdio(false);
int n;
cin >> n;
vector<int> a(2 * n);
vector<int> b(2 * n);
cin >> a >> b;
vector<Range> rA(2 * n, {-1000000000, -1000000000}), rB(2 * n, {-1000000000, -1000000000});
rA[0] = {0, 0};
rB[0] = {1, 1};
for (int i = 1; i < n * 2; i++)
{
if (a[i] >= a[i - 1])
rA[i] = rA[i] + rA[i - 1];
if (a[i] >= b[i - 1])
rA[i] = rA[i] + rB[i - 1];
if (b[i] >= a[i - 1])
rB[i] = (rB[i] + rA[i - 1]);
if (b[i] >= b[i - 1])
rB[i] = (rB[i] + rB[i - 1]);
rB[i] = rB[i] + 1;
}
string out;
int needed = n;
int last_taken = 10000000000000;
while (rA.size())
{
if (needed >= rA.back().low && needed <= rA.back().high && a.back() <= last_taken)
{
out.push_back('A');
last_taken = a.back();
}
else if (needed >= rB.back().low && needed <= rB.back().high && b.back() <= last_taken)
{
out.push_back('B');
last_taken = b.back();
needed--;
}
else
{
cout << -1;
return 0;
}
rA.pop_back();
rB.pop_back();
a.pop_back();
b.pop_back();
}
reverse(out.begin(), out.end());
cout << out;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
0 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
468 KB |
Output is correct |
| 6 |
Correct |
1 ms |
468 KB |
Output is correct |
| 7 |
Correct |
1 ms |
468 KB |
Output is correct |
| 8 |
Correct |
1 ms |
436 KB |
Output is correct |
| 9 |
Correct |
1 ms |
468 KB |
Output is correct |
| 10 |
Correct |
1 ms |
468 KB |
Output is correct |
| 11 |
Correct |
1 ms |
468 KB |
Output is correct |
| 12 |
Correct |
1 ms |
596 KB |
Output is correct |
| 13 |
Correct |
1 ms |
596 KB |
Output is correct |
| 14 |
Correct |
1 ms |
596 KB |
Output is correct |
| 15 |
Correct |
1 ms |
596 KB |
Output is correct |
| 16 |
Correct |
1 ms |
460 KB |
Output is correct |
| 17 |
Correct |
1 ms |
588 KB |
Output is correct |
| 18 |
Correct |
1 ms |
596 KB |
Output is correct |
| 19 |
Correct |
1 ms |
596 KB |
Output is correct |
| 20 |
Correct |
1 ms |
468 KB |
Output is correct |
| 21 |
Correct |
2 ms |
588 KB |
Output is correct |
| 22 |
Correct |
1 ms |
460 KB |
Output is correct |
| 23 |
Correct |
1 ms |
468 KB |
Output is correct |
| 24 |
Correct |
1 ms |
584 KB |
Output is correct |
| 25 |
Correct |
1 ms |
468 KB |
Output is correct |
| 26 |
Correct |
1 ms |
468 KB |
Output is correct |
| 27 |
Correct |
1 ms |
468 KB |
Output is correct |
| 28 |
Correct |
1 ms |
464 KB |
Output is correct |
| 29 |
Correct |
1 ms |
468 KB |
Output is correct |
| 30 |
Correct |
1 ms |
468 KB |
Output is correct |
| 31 |
Correct |
1 ms |
456 KB |
Output is correct |
| 32 |
Correct |
1 ms |
468 KB |
Output is correct |
| 33 |
Correct |
1 ms |
468 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
0 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
468 KB |
Output is correct |
| 6 |
Correct |
1 ms |
468 KB |
Output is correct |
| 7 |
Correct |
1 ms |
468 KB |
Output is correct |
| 8 |
Correct |
1 ms |
436 KB |
Output is correct |
| 9 |
Correct |
1 ms |
468 KB |
Output is correct |
| 10 |
Correct |
1 ms |
468 KB |
Output is correct |
| 11 |
Correct |
1 ms |
468 KB |
Output is correct |
| 12 |
Correct |
1 ms |
596 KB |
Output is correct |
| 13 |
Correct |
1 ms |
596 KB |
Output is correct |
| 14 |
Correct |
1 ms |
596 KB |
Output is correct |
| 15 |
Correct |
1 ms |
596 KB |
Output is correct |
| 16 |
Correct |
1 ms |
460 KB |
Output is correct |
| 17 |
Correct |
1 ms |
588 KB |
Output is correct |
| 18 |
Correct |
1 ms |
596 KB |
Output is correct |
| 19 |
Correct |
1 ms |
596 KB |
Output is correct |
| 20 |
Correct |
1 ms |
468 KB |
Output is correct |
| 21 |
Correct |
2 ms |
588 KB |
Output is correct |
| 22 |
Correct |
1 ms |
460 KB |
Output is correct |
| 23 |
Correct |
1 ms |
468 KB |
Output is correct |
| 24 |
Correct |
1 ms |
584 KB |
Output is correct |
| 25 |
Correct |
1 ms |
468 KB |
Output is correct |
| 26 |
Correct |
1 ms |
468 KB |
Output is correct |
| 27 |
Correct |
1 ms |
468 KB |
Output is correct |
| 28 |
Correct |
1 ms |
464 KB |
Output is correct |
| 29 |
Correct |
1 ms |
468 KB |
Output is correct |
| 30 |
Correct |
1 ms |
468 KB |
Output is correct |
| 31 |
Correct |
1 ms |
456 KB |
Output is correct |
| 32 |
Correct |
1 ms |
468 KB |
Output is correct |
| 33 |
Correct |
1 ms |
468 KB |
Output is correct |
| 34 |
Correct |
174 ms |
65504 KB |
Output is correct |
| 35 |
Correct |
184 ms |
63664 KB |
Output is correct |
| 36 |
Correct |
182 ms |
62848 KB |
Output is correct |
| 37 |
Correct |
174 ms |
64052 KB |
Output is correct |
| 38 |
Correct |
168 ms |
63964 KB |
Output is correct |
| 39 |
Correct |
162 ms |
63272 KB |
Output is correct |
| 40 |
Correct |
177 ms |
68116 KB |
Output is correct |
| 41 |
Correct |
194 ms |
64648 KB |
Output is correct |
| 42 |
Correct |
183 ms |
66488 KB |
Output is correct |
| 43 |
Correct |
187 ms |
68692 KB |
Output is correct |
| 44 |
Correct |
202 ms |
68972 KB |
Output is correct |
| 45 |
Correct |
192 ms |
68688 KB |
Output is correct |
| 46 |
Correct |
181 ms |
68692 KB |
Output is correct |
| 47 |
Correct |
194 ms |
67812 KB |
Output is correct |
| 48 |
Correct |
188 ms |
67668 KB |
Output is correct |
| 49 |
Correct |
199 ms |
68468 KB |
Output is correct |
| 50 |
Correct |
189 ms |
67884 KB |
Output is correct |
| 51 |
Correct |
186 ms |
67904 KB |
Output is correct |
| 52 |
Correct |
137 ms |
57056 KB |
Output is correct |
| 53 |
Correct |
129 ms |
56932 KB |
Output is correct |
| 54 |
Correct |
127 ms |
57028 KB |
Output is correct |
| 55 |
Correct |
122 ms |
56724 KB |
Output is correct |
| 56 |
Correct |
184 ms |
68972 KB |
Output is correct |
| 57 |
Correct |
154 ms |
63616 KB |
Output is correct |
| 58 |
Correct |
159 ms |
63968 KB |
Output is correct |
| 59 |
Correct |
170 ms |
63880 KB |
Output is correct |
| 60 |
Correct |
174 ms |
60432 KB |
Output is correct |
| 61 |
Correct |
174 ms |
64368 KB |
Output is correct |
| 62 |
Correct |
178 ms |
63456 KB |
Output is correct |
| 63 |
Correct |
164 ms |
64428 KB |
Output is correct |
| 64 |
Correct |
177 ms |
62180 KB |
Output is correct |
| 65 |
Correct |
181 ms |
64352 KB |
Output is correct |
