#include<bits/stdc++.h>
using namespace std;
#define forinc(a,b,c) for(int a=b, __c=c; a<=__c; ++a)
#define fordec(a,b,c) for(int a=b, __c=c; a>=__c; --a)
#define forv(a,b) for(auto &a:b)
#define ii pair<int,int>
#define fi first
#define se second
#define pb push_back
#define eb emplace_back
#define all(a) begin(a),end(a)
#define reset(f,x) memset(f,x,sizeof(f))
#define fasty ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0)
const int N=1e6+5;
int n,a[N][2],dd[N][2];
ii f[N][2];
void dfs(int i,int j){
if(dd[i][j]) return;
dd[i][j]=1;
int mi=1e9, ma=-1e9;
if(a[i][j]<=a[i+1][0]){
dfs(i+1,0);
mi=min(mi,f[i+1][0].fi+1); ma=max(ma, f[i+1][0].se+1);
}
if(a[i][j]<=a[i+1][1]){
dfs(i+1,1);
mi=min(mi,f[i+1][1].fi); ma=max(ma, f[i+1][1].se);
}
f[i][j]={mi,ma};
}
int32_t main(){
fasty;
#define task "build"
if(fopen(task".in","r")) freopen(task".in","r",stdin);
cin>>n; n*=2;
forinc(_,0,1) forinc(i,1,n) cin>>a[i][_];
dd[n][0]=dd[n][1]=1;
dfs(0,0);
if(f[0][0].fi>n/2 || f[0][0].fi>f[0][0].se) return cout<<-1,0;
int pre=0, re=n/2;
forinc(i,1,n){
if(a[i][0]>=a[i-1][pre] && f[i][0].fi<=re-1 && re-1<=f[i][0].se){
pre=0;
re--;
cout<<"A";
}else{
pre=1;
cout<<"B";
}
}
}
Compilation message
building4.cpp: In function 'int32_t main()':
building4.cpp:41:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
41 | if(fopen(task".in","r")) freopen(task".in","r",stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
384 KB |
Output is correct |
2 |
Correct |
0 ms |
384 KB |
Output is correct |
3 |
Correct |
1 ms |
384 KB |
Output is correct |
4 |
Correct |
1 ms |
384 KB |
Output is correct |
5 |
Correct |
1 ms |
444 KB |
Output is correct |
6 |
Correct |
2 ms |
768 KB |
Output is correct |
7 |
Correct |
2 ms |
640 KB |
Output is correct |
8 |
Correct |
2 ms |
768 KB |
Output is correct |
9 |
Correct |
2 ms |
768 KB |
Output is correct |
10 |
Correct |
1 ms |
640 KB |
Output is correct |
11 |
Correct |
2 ms |
768 KB |
Output is correct |
12 |
Correct |
2 ms |
768 KB |
Output is correct |
13 |
Correct |
2 ms |
768 KB |
Output is correct |
14 |
Correct |
2 ms |
768 KB |
Output is correct |
15 |
Correct |
2 ms |
768 KB |
Output is correct |
16 |
Correct |
2 ms |
768 KB |
Output is correct |
17 |
Correct |
2 ms |
768 KB |
Output is correct |
18 |
Correct |
2 ms |
768 KB |
Output is correct |
19 |
Correct |
2 ms |
768 KB |
Output is correct |
20 |
Correct |
2 ms |
768 KB |
Output is correct |
21 |
Correct |
2 ms |
800 KB |
Output is correct |
22 |
Correct |
2 ms |
768 KB |
Output is correct |
23 |
Correct |
2 ms |
768 KB |
Output is correct |
24 |
Correct |
2 ms |
768 KB |
Output is correct |
25 |
Correct |
2 ms |
768 KB |
Output is correct |
26 |
Correct |
2 ms |
768 KB |
Output is correct |
27 |
Correct |
2 ms |
768 KB |
Output is correct |
28 |
Correct |
2 ms |
768 KB |
Output is correct |
29 |
Correct |
2 ms |
768 KB |
Output is correct |
30 |
Correct |
2 ms |
768 KB |
Output is correct |
31 |
Correct |
2 ms |
768 KB |
Output is correct |
32 |
Correct |
1 ms |
768 KB |
Output is correct |
33 |
Correct |
2 ms |
768 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
384 KB |
Output is correct |
2 |
Correct |
0 ms |
384 KB |
Output is correct |
3 |
Correct |
1 ms |
384 KB |
Output is correct |
4 |
Correct |
1 ms |
384 KB |
Output is correct |
5 |
Correct |
1 ms |
444 KB |
Output is correct |
6 |
Correct |
2 ms |
768 KB |
Output is correct |
7 |
Correct |
2 ms |
640 KB |
Output is correct |
8 |
Correct |
2 ms |
768 KB |
Output is correct |
9 |
Correct |
2 ms |
768 KB |
Output is correct |
10 |
Correct |
1 ms |
640 KB |
Output is correct |
11 |
Correct |
2 ms |
768 KB |
Output is correct |
12 |
Correct |
2 ms |
768 KB |
Output is correct |
13 |
Correct |
2 ms |
768 KB |
Output is correct |
14 |
Correct |
2 ms |
768 KB |
Output is correct |
15 |
Correct |
2 ms |
768 KB |
Output is correct |
16 |
Correct |
2 ms |
768 KB |
Output is correct |
17 |
Correct |
2 ms |
768 KB |
Output is correct |
18 |
Correct |
2 ms |
768 KB |
Output is correct |
19 |
Correct |
2 ms |
768 KB |
Output is correct |
20 |
Correct |
2 ms |
768 KB |
Output is correct |
21 |
Correct |
2 ms |
800 KB |
Output is correct |
22 |
Correct |
2 ms |
768 KB |
Output is correct |
23 |
Correct |
2 ms |
768 KB |
Output is correct |
24 |
Correct |
2 ms |
768 KB |
Output is correct |
25 |
Correct |
2 ms |
768 KB |
Output is correct |
26 |
Correct |
2 ms |
768 KB |
Output is correct |
27 |
Correct |
2 ms |
768 KB |
Output is correct |
28 |
Correct |
2 ms |
768 KB |
Output is correct |
29 |
Correct |
2 ms |
768 KB |
Output is correct |
30 |
Correct |
2 ms |
768 KB |
Output is correct |
31 |
Correct |
2 ms |
768 KB |
Output is correct |
32 |
Correct |
1 ms |
768 KB |
Output is correct |
33 |
Correct |
2 ms |
768 KB |
Output is correct |
34 |
Correct |
227 ms |
8176 KB |
Output is correct |
35 |
Correct |
334 ms |
103032 KB |
Output is correct |
36 |
Correct |
326 ms |
101368 KB |
Output is correct |
37 |
Correct |
332 ms |
103544 KB |
Output is correct |
38 |
Correct |
330 ms |
103416 KB |
Output is correct |
39 |
Correct |
330 ms |
103928 KB |
Output is correct |
40 |
Correct |
360 ms |
110584 KB |
Output is correct |
41 |
Correct |
361 ms |
105720 KB |
Output is correct |
42 |
Correct |
351 ms |
107768 KB |
Output is correct |
43 |
Correct |
379 ms |
111176 KB |
Output is correct |
44 |
Correct |
362 ms |
111096 KB |
Output is correct |
45 |
Correct |
360 ms |
111100 KB |
Output is correct |
46 |
Correct |
382 ms |
111108 KB |
Output is correct |
47 |
Correct |
355 ms |
111188 KB |
Output is correct |
48 |
Correct |
363 ms |
111224 KB |
Output is correct |
49 |
Correct |
371 ms |
111224 KB |
Output is correct |
50 |
Correct |
367 ms |
111224 KB |
Output is correct |
51 |
Correct |
375 ms |
111072 KB |
Output is correct |
52 |
Correct |
351 ms |
115724 KB |
Output is correct |
53 |
Correct |
291 ms |
115704 KB |
Output is correct |
54 |
Correct |
284 ms |
115704 KB |
Output is correct |
55 |
Correct |
306 ms |
115824 KB |
Output is correct |
56 |
Correct |
393 ms |
111096 KB |
Output is correct |
57 |
Correct |
357 ms |
114296 KB |
Output is correct |
58 |
Correct |
353 ms |
114816 KB |
Output is correct |
59 |
Correct |
330 ms |
114884 KB |
Output is correct |
60 |
Correct |
316 ms |
108152 KB |
Output is correct |
61 |
Correct |
339 ms |
114808 KB |
Output is correct |
62 |
Correct |
337 ms |
113272 KB |
Output is correct |
63 |
Correct |
342 ms |
114808 KB |
Output is correct |
64 |
Correct |
328 ms |
111124 KB |
Output is correct |
65 |
Correct |
342 ms |
114808 KB |
Output is correct |