#include<bits/stdc++.h>
#define pb push_back
using namespace std ;
const int maxn = 2e6 + 12 ;
int n, v[2][maxn], dpmax[maxn][2], dpmin[maxn][2] ;
int mind(int n, int flag){
if(n == 0) return 0 ;
if(dpmin[n][flag] != -1) return dpmin[n][flag] ;
int ans = 4*maxn ;
for(int i = 0 ; i < 2 ; i++){
if(v[i][n] <= v[flag][n+1]) ans = min(ans, mind(n-1, i) + i) ;
}
return dpmin[n][flag] = ans ;
}
int maxd(int n, int flag){
if(n == 0) return 0 ;
if(dpmax[n][flag] != -1) return dpmax[n][flag] ;
int ans = -4*maxn ;
for(int i = 0 ; i < 2 ; i++){
if(v[i][n] <= v[flag][n+1]) ans = max(ans, maxd(n-1, i) + i) ;
}
return dpmax[n][flag] = ans ;
}
int main(){
ios_base::sync_with_stdio(false) ; cin.tie(NULL) ;
cin >> n ;
n*=2 ;
string s ;
for(int i = 1 ; i <= n ; i++) cin >> v[0][i] ;
for(int i = 1 ; i <= n ; i++) cin >> v[1][i] ;
v[1][n+1] = v[0][n+1] = (int) 2e9 ;
int qa = n/2, qb = n/2, ant = 0 ;
memset(dpmin, -1, sizeof dpmin), memset(dpmax, -1, sizeof dpmax) ;
for(int i = n ; i > 0 ; i--){
if(mind(i, ant) <= qb && maxd(i, ant) >= qb){
int mina = mind(i - 1, 0), maxa = maxd(i-1, 0) ;
int minb = mind(i-1, 1), maxb = maxd(i-1, 1) ;
if(qa && mina <= qb && maxa >= qb && v[0][i] <= v[ant][i+1]) qa--, s.pb('A'), ant = 0 ;
else if(qb) qb--, ant = 1, s.pb('B') ;
}
else{
cout << -1 << "\n" ;
return 0 ;
}
}
reverse(s.begin(), s.end()) ;
if(qa != 0 || qb != 0) cout << -1 << "\n" ;
else cout << s << "\n" ;
}
Compilation message
building4.cpp: In function 'int main()':
building4.cpp:61:11: warning: unused variable 'minb' [-Wunused-variable]
61 | int minb = mind(i-1, 1), maxb = maxd(i-1, 1) ;
| ^~~~
building4.cpp:61:32: warning: unused variable 'maxb' [-Wunused-variable]
61 | int minb = mind(i-1, 1), maxb = maxd(i-1, 1) ;
| ^~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
21 ms |
31596 KB |
Output is correct |
| 2 |
Correct |
18 ms |
31596 KB |
Output is correct |
| 3 |
Correct |
18 ms |
31596 KB |
Output is correct |
| 4 |
Correct |
18 ms |
31596 KB |
Output is correct |
| 5 |
Correct |
20 ms |
31724 KB |
Output is correct |
| 6 |
Correct |
22 ms |
31852 KB |
Output is correct |
| 7 |
Correct |
23 ms |
31852 KB |
Output is correct |
| 8 |
Correct |
20 ms |
31948 KB |
Output is correct |
| 9 |
Correct |
19 ms |
31880 KB |
Output is correct |
| 10 |
Correct |
19 ms |
31852 KB |
Output is correct |
| 11 |
Correct |
20 ms |
31980 KB |
Output is correct |
| 12 |
Correct |
23 ms |
31980 KB |
Output is correct |
| 13 |
Correct |
22 ms |
31980 KB |
Output is correct |
| 14 |
Correct |
21 ms |
31980 KB |
Output is correct |
| 15 |
Correct |
19 ms |
31980 KB |
Output is correct |
| 16 |
Correct |
23 ms |
31980 KB |
Output is correct |
| 17 |
Correct |
19 ms |
32128 KB |
Output is correct |
| 18 |
Correct |
20 ms |
31980 KB |
Output is correct |
| 19 |
Correct |
22 ms |
31980 KB |
Output is correct |
| 20 |
Correct |
23 ms |
31980 KB |
Output is correct |
| 21 |
Correct |
22 ms |
31980 KB |
Output is correct |
| 22 |
Correct |
22 ms |
31980 KB |
Output is correct |
| 23 |
Correct |
19 ms |
31980 KB |
Output is correct |
| 24 |
Correct |
19 ms |
31980 KB |
Output is correct |
| 25 |
Correct |
19 ms |
31980 KB |
Output is correct |
| 26 |
Correct |
19 ms |
31980 KB |
Output is correct |
| 27 |
Correct |
22 ms |
31980 KB |
Output is correct |
| 28 |
Correct |
19 ms |
31852 KB |
Output is correct |
| 29 |
Correct |
19 ms |
31980 KB |
Output is correct |
| 30 |
Correct |
20 ms |
32128 KB |
Output is correct |
| 31 |
Correct |
22 ms |
32128 KB |
Output is correct |
| 32 |
Correct |
19 ms |
31852 KB |
Output is correct |
| 33 |
Correct |
23 ms |
31980 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
21 ms |
31596 KB |
Output is correct |
| 2 |
Correct |
18 ms |
31596 KB |
Output is correct |
| 3 |
Correct |
18 ms |
31596 KB |
Output is correct |
| 4 |
Correct |
18 ms |
31596 KB |
Output is correct |
| 5 |
Correct |
20 ms |
31724 KB |
Output is correct |
| 6 |
Correct |
22 ms |
31852 KB |
Output is correct |
| 7 |
Correct |
23 ms |
31852 KB |
Output is correct |
| 8 |
Correct |
20 ms |
31948 KB |
Output is correct |
| 9 |
Correct |
19 ms |
31880 KB |
Output is correct |
| 10 |
Correct |
19 ms |
31852 KB |
Output is correct |
| 11 |
Correct |
20 ms |
31980 KB |
Output is correct |
| 12 |
Correct |
23 ms |
31980 KB |
Output is correct |
| 13 |
Correct |
22 ms |
31980 KB |
Output is correct |
| 14 |
Correct |
21 ms |
31980 KB |
Output is correct |
| 15 |
Correct |
19 ms |
31980 KB |
Output is correct |
| 16 |
Correct |
23 ms |
31980 KB |
Output is correct |
| 17 |
Correct |
19 ms |
32128 KB |
Output is correct |
| 18 |
Correct |
20 ms |
31980 KB |
Output is correct |
| 19 |
Correct |
22 ms |
31980 KB |
Output is correct |
| 20 |
Correct |
23 ms |
31980 KB |
Output is correct |
| 21 |
Correct |
22 ms |
31980 KB |
Output is correct |
| 22 |
Correct |
22 ms |
31980 KB |
Output is correct |
| 23 |
Correct |
19 ms |
31980 KB |
Output is correct |
| 24 |
Correct |
19 ms |
31980 KB |
Output is correct |
| 25 |
Correct |
19 ms |
31980 KB |
Output is correct |
| 26 |
Correct |
19 ms |
31980 KB |
Output is correct |
| 27 |
Correct |
22 ms |
31980 KB |
Output is correct |
| 28 |
Correct |
19 ms |
31852 KB |
Output is correct |
| 29 |
Correct |
19 ms |
31980 KB |
Output is correct |
| 30 |
Correct |
20 ms |
32128 KB |
Output is correct |
| 31 |
Correct |
22 ms |
32128 KB |
Output is correct |
| 32 |
Correct |
19 ms |
31852 KB |
Output is correct |
| 33 |
Correct |
23 ms |
31980 KB |
Output is correct |
| 34 |
Correct |
255 ms |
39532 KB |
Output is correct |
| 35 |
Correct |
352 ms |
98980 KB |
Output is correct |
| 36 |
Correct |
366 ms |
97916 KB |
Output is correct |
| 37 |
Correct |
423 ms |
99240 KB |
Output is correct |
| 38 |
Correct |
351 ms |
99264 KB |
Output is correct |
| 39 |
Correct |
358 ms |
99532 KB |
Output is correct |
| 40 |
Correct |
393 ms |
103904 KB |
Output is correct |
| 41 |
Correct |
347 ms |
100676 KB |
Output is correct |
| 42 |
Correct |
426 ms |
102180 KB |
Output is correct |
| 43 |
Correct |
387 ms |
104544 KB |
Output is correct |
| 44 |
Correct |
403 ms |
104288 KB |
Output is correct |
| 45 |
Correct |
380 ms |
104264 KB |
Output is correct |
| 46 |
Correct |
375 ms |
104288 KB |
Output is correct |
| 47 |
Correct |
357 ms |
104280 KB |
Output is correct |
| 48 |
Correct |
410 ms |
104288 KB |
Output is correct |
| 49 |
Correct |
358 ms |
104416 KB |
Output is correct |
| 50 |
Correct |
440 ms |
104288 KB |
Output is correct |
| 51 |
Correct |
431 ms |
104304 KB |
Output is correct |
| 52 |
Correct |
304 ms |
104328 KB |
Output is correct |
| 53 |
Correct |
315 ms |
104288 KB |
Output is correct |
| 54 |
Correct |
278 ms |
104288 KB |
Output is correct |
| 55 |
Correct |
323 ms |
104200 KB |
Output is correct |
| 56 |
Correct |
356 ms |
104416 KB |
Output is correct |
| 57 |
Correct |
335 ms |
103904 KB |
Output is correct |
| 58 |
Correct |
350 ms |
104288 KB |
Output is correct |
| 59 |
Correct |
434 ms |
104288 KB |
Output is correct |
| 60 |
Correct |
351 ms |
100220 KB |
Output is correct |
| 61 |
Correct |
340 ms |
104408 KB |
Output is correct |
| 62 |
Correct |
353 ms |
103376 KB |
Output is correct |
| 63 |
Correct |
336 ms |
104680 KB |
Output is correct |
| 64 |
Correct |
326 ms |
102048 KB |
Output is correct |
| 65 |
Correct |
332 ms |
104564 KB |
Output is correct |
