#pragma GCC optimization "O2"
#pragma GCC optimization "unroll-loop"
#pragma GCC target ("avx2")
#include <bits/stdc++.h>
#define ll int
#define ld long double
#define fs first
#define sc second
using namespace std;
const ll N = 1e6 + 6;
const ll Log2 = 19;
const ll inf = 1e9 + 7;
typedef pair<ll,ll> LL;
///Road to EF/M
LL dp[N][2];
ll n,a[N][2];
LL f(ll i,ll j){
if (i == n) return {0,0};
if (dp[i][j].fs != -1) return dp[i][j];
LL ans = {inf,-inf};
if (a[i][j] <= a[i + 1][0]){
ans.fs = min(ans.fs,f(i + 1,0).fs);
ans.sc = max(ans.sc,f(i + 1,0).sc);
}
if (a[i][j] <= a[i + 1][1]){
ans.fs = min(ans.fs,f(i + 1,1).fs + 1);
ans.sc = max(ans.sc,f(i + 1,1).sc + 1);
}
return dp[i][j] = ans;
}
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0), cout.tie(0);
#define task "tst"
if (fopen(task".inp", "r")){
freopen(task".inp", "r", stdin);
//freopen(task".out", "w", stdout);
}
cin>>n; n *= 2;
for (ll i = 0;i <= n;i++) dp[i][0] = dp[i][1] = {-1,-1};
for (ll i = 1;i <= n;i++) cin>>a[i][0];
for (ll i = 1;i <= n;i++) cin>>a[i][1];
//cout<<f(0,0).fs<<" "<<f(0,0).sc; return 0;
if (f(0,0).fs > n/2 || f(0,0).sc < n/2) return cout<<-1,0;
ll prv = 0,rm = n/2;
for (ll i = 1;i <= n;i++){
if (a[i][0] >= a[i - 1][prv]&&f(i,0).fs <= rm&&f(i,0).sc >= rm)
prv = 0,cout<<"A";
else{
prv = 1; cout<<"B"; rm--;
}
}
}
Compilation message
building4.cpp:1: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
1 | #pragma GCC optimization "O2"
|
building4.cpp:2: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
2 | #pragma GCC optimization "unroll-loop"
|
building4.cpp: In function 'int main()':
building4.cpp:39:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
39 | freopen(task".inp", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
332 KB |
Output is correct |
2 |
Correct |
1 ms |
332 KB |
Output is correct |
3 |
Correct |
1 ms |
324 KB |
Output is correct |
4 |
Correct |
1 ms |
332 KB |
Output is correct |
5 |
Correct |
2 ms |
460 KB |
Output is correct |
6 |
Correct |
2 ms |
724 KB |
Output is correct |
7 |
Correct |
3 ms |
804 KB |
Output is correct |
8 |
Correct |
2 ms |
720 KB |
Output is correct |
9 |
Correct |
3 ms |
716 KB |
Output is correct |
10 |
Correct |
2 ms |
716 KB |
Output is correct |
11 |
Correct |
2 ms |
716 KB |
Output is correct |
12 |
Correct |
2 ms |
716 KB |
Output is correct |
13 |
Correct |
2 ms |
728 KB |
Output is correct |
14 |
Correct |
2 ms |
716 KB |
Output is correct |
15 |
Correct |
2 ms |
716 KB |
Output is correct |
16 |
Correct |
2 ms |
716 KB |
Output is correct |
17 |
Correct |
2 ms |
716 KB |
Output is correct |
18 |
Correct |
2 ms |
716 KB |
Output is correct |
19 |
Correct |
2 ms |
716 KB |
Output is correct |
20 |
Correct |
2 ms |
716 KB |
Output is correct |
21 |
Correct |
2 ms |
716 KB |
Output is correct |
22 |
Correct |
2 ms |
716 KB |
Output is correct |
23 |
Correct |
2 ms |
716 KB |
Output is correct |
24 |
Correct |
2 ms |
716 KB |
Output is correct |
25 |
Correct |
2 ms |
716 KB |
Output is correct |
26 |
Correct |
2 ms |
720 KB |
Output is correct |
27 |
Correct |
2 ms |
716 KB |
Output is correct |
28 |
Correct |
2 ms |
716 KB |
Output is correct |
29 |
Correct |
2 ms |
716 KB |
Output is correct |
30 |
Correct |
2 ms |
716 KB |
Output is correct |
31 |
Correct |
2 ms |
716 KB |
Output is correct |
32 |
Correct |
2 ms |
588 KB |
Output is correct |
33 |
Correct |
2 ms |
716 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
332 KB |
Output is correct |
2 |
Correct |
1 ms |
332 KB |
Output is correct |
3 |
Correct |
1 ms |
324 KB |
Output is correct |
4 |
Correct |
1 ms |
332 KB |
Output is correct |
5 |
Correct |
2 ms |
460 KB |
Output is correct |
6 |
Correct |
2 ms |
724 KB |
Output is correct |
7 |
Correct |
3 ms |
804 KB |
Output is correct |
8 |
Correct |
2 ms |
720 KB |
Output is correct |
9 |
Correct |
3 ms |
716 KB |
Output is correct |
10 |
Correct |
2 ms |
716 KB |
Output is correct |
11 |
Correct |
2 ms |
716 KB |
Output is correct |
12 |
Correct |
2 ms |
716 KB |
Output is correct |
13 |
Correct |
2 ms |
728 KB |
Output is correct |
14 |
Correct |
2 ms |
716 KB |
Output is correct |
15 |
Correct |
2 ms |
716 KB |
Output is correct |
16 |
Correct |
2 ms |
716 KB |
Output is correct |
17 |
Correct |
2 ms |
716 KB |
Output is correct |
18 |
Correct |
2 ms |
716 KB |
Output is correct |
19 |
Correct |
2 ms |
716 KB |
Output is correct |
20 |
Correct |
2 ms |
716 KB |
Output is correct |
21 |
Correct |
2 ms |
716 KB |
Output is correct |
22 |
Correct |
2 ms |
716 KB |
Output is correct |
23 |
Correct |
2 ms |
716 KB |
Output is correct |
24 |
Correct |
2 ms |
716 KB |
Output is correct |
25 |
Correct |
2 ms |
716 KB |
Output is correct |
26 |
Correct |
2 ms |
720 KB |
Output is correct |
27 |
Correct |
2 ms |
716 KB |
Output is correct |
28 |
Correct |
2 ms |
716 KB |
Output is correct |
29 |
Correct |
2 ms |
716 KB |
Output is correct |
30 |
Correct |
2 ms |
716 KB |
Output is correct |
31 |
Correct |
2 ms |
716 KB |
Output is correct |
32 |
Correct |
2 ms |
588 KB |
Output is correct |
33 |
Correct |
2 ms |
716 KB |
Output is correct |
34 |
Correct |
255 ms |
42604 KB |
Output is correct |
35 |
Correct |
352 ms |
113368 KB |
Output is correct |
36 |
Correct |
345 ms |
111640 KB |
Output is correct |
37 |
Correct |
346 ms |
113960 KB |
Output is correct |
38 |
Correct |
343 ms |
113860 KB |
Output is correct |
39 |
Correct |
338 ms |
113476 KB |
Output is correct |
40 |
Correct |
367 ms |
121528 KB |
Output is correct |
41 |
Correct |
374 ms |
115652 KB |
Output is correct |
42 |
Correct |
353 ms |
118468 KB |
Output is correct |
43 |
Correct |
360 ms |
122308 KB |
Output is correct |
44 |
Correct |
371 ms |
122312 KB |
Output is correct |
45 |
Correct |
368 ms |
122312 KB |
Output is correct |
46 |
Correct |
355 ms |
122404 KB |
Output is correct |
47 |
Correct |
361 ms |
121424 KB |
Output is correct |
48 |
Correct |
356 ms |
121248 KB |
Output is correct |
49 |
Correct |
366 ms |
122108 KB |
Output is correct |
50 |
Correct |
369 ms |
121488 KB |
Output is correct |
51 |
Correct |
362 ms |
121608 KB |
Output is correct |
52 |
Correct |
289 ms |
110724 KB |
Output is correct |
53 |
Correct |
292 ms |
110804 KB |
Output is correct |
54 |
Correct |
281 ms |
110616 KB |
Output is correct |
55 |
Correct |
282 ms |
110396 KB |
Output is correct |
56 |
Correct |
374 ms |
122552 KB |
Output is correct |
57 |
Correct |
334 ms |
117060 KB |
Output is correct |
58 |
Correct |
331 ms |
117604 KB |
Output is correct |
59 |
Correct |
317 ms |
117516 KB |
Output is correct |
60 |
Correct |
313 ms |
110848 KB |
Output is correct |
61 |
Correct |
336 ms |
118100 KB |
Output is correct |
62 |
Correct |
324 ms |
116372 KB |
Output is correct |
63 |
Correct |
329 ms |
118096 KB |
Output is correct |
64 |
Correct |
323 ms |
114116 KB |
Output is correct |
65 |
Correct |
334 ms |
118088 KB |
Output is correct |