#pragma GCC optimize("Ofast,unroll-loops,no-stack-protector")
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
#include<ext/rope>
using namespace __gnu_pbds;
using namespace __gnu_cxx;
#define tr(it,a) for(auto it:a)
#define pob pop_back
#define pf push_front
#define pof pop_front
#define umin(x,y) (x=min(x,(y)))
#define umax(x,y) (x=max(x,(y)))
#define mid ((l+r)/2)
#define lch (idx*2+1)
#define rch (idx*2+2)
//
#include<bits/stdc++.h>
#define int int_fast64_t
using namespace std;
typedef pair<int,int> pii;
#define REP(i,j,k) for(int i=(j);i<(k);++i)
#define RREP(i,j,k) for(int i=int(j)-1;i>=(k);--i)
#define ALL(a) a.begin(),a.end()
#define pb push_back
#define f first
#define s second
#define endl '\n'
// #define __db
#ifdef __db
#define IOS
#define prt(...) cerr<<__VA_ARGS__
#define ary(s,t)\
for(auto it=(s);it!=(t);++it)prt(*it<<" ");\
prt(endl);
#else
#define IOS cin.tie(0),cout.tie(0),ios_base::sync_with_stdio(false)
#define prt(...)
#define ary(...)
#endif
//
const int maxn=1e6+9,inf=1ll<<60;
int n,m,a[maxn][2];
pii dp[maxn][2];
string s;
pii merge(pii x,pii y){
if(x.f<0)return y;
else if(y.f<0)return x;
else return {min(x.f,y.f),max(x.s,y.s)};
}
main(){
IOS;
cin>>n,m=n<<1;
REP(i,0,2)REP(j,0,m)cin>>a[j][i];
dp[0][0]={0,0};
dp[0][1]={1,1};
REP(i,1,m){
REP(j,0,2){
dp[i][j]={-inf,-inf};
if(a[i-1][0]<=a[i][j]){
pii tt=dp[i-1][0];
tt.f+=j,tt.s+=j;
dp[i][j]=merge(dp[i][j],tt);
}
if(a[i-1][1]<=a[i][j]){
pii tt=dp[i-1][1];
tt.f+=j,tt.s+=j;
dp[i][j]=merge(dp[i][j],tt);
}
}
}
pii tt={m-1,0},x=dp[tt.f][tt.s];
if(n<x.f||x.s<n){
tt.s=1,x=dp[tt.f][tt.s];
if(n<x.f||x.s<n)return cout<<-1<<endl,0;
}
s+='A'+tt.s;
int c=n-tt.s;
while(tt.f){
REP(i,0,2){
if(a[tt.f-1][i]<=a[tt.f][tt.s]&&dp[tt.f-1][i].f<=c&&c<=dp[tt.f-1][i].s){
tt={tt.f-1,i};
c-=i;
break;
}
}
s+='A'+tt.s;
}
reverse(ALL(s));
cout<<s<<endl;
}
Compilation message
building4.cpp:52:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
main(){
^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
5 ms |
384 KB |
Output is correct |
| 2 |
Correct |
5 ms |
384 KB |
Output is correct |
| 3 |
Correct |
5 ms |
384 KB |
Output is correct |
| 4 |
Correct |
4 ms |
384 KB |
Output is correct |
| 5 |
Correct |
6 ms |
640 KB |
Output is correct |
| 6 |
Correct |
6 ms |
640 KB |
Output is correct |
| 7 |
Correct |
6 ms |
640 KB |
Output is correct |
| 8 |
Correct |
6 ms |
512 KB |
Output is correct |
| 9 |
Correct |
6 ms |
640 KB |
Output is correct |
| 10 |
Correct |
5 ms |
640 KB |
Output is correct |
| 11 |
Correct |
6 ms |
640 KB |
Output is correct |
| 12 |
Correct |
6 ms |
640 KB |
Output is correct |
| 13 |
Correct |
6 ms |
640 KB |
Output is correct |
| 14 |
Correct |
6 ms |
640 KB |
Output is correct |
| 15 |
Correct |
6 ms |
640 KB |
Output is correct |
| 16 |
Correct |
6 ms |
640 KB |
Output is correct |
| 17 |
Correct |
6 ms |
768 KB |
Output is correct |
| 18 |
Correct |
6 ms |
640 KB |
Output is correct |
| 19 |
Correct |
6 ms |
640 KB |
Output is correct |
| 20 |
Correct |
5 ms |
640 KB |
Output is correct |
| 21 |
Correct |
5 ms |
640 KB |
Output is correct |
| 22 |
Correct |
5 ms |
640 KB |
Output is correct |
| 23 |
Correct |
5 ms |
640 KB |
Output is correct |
| 24 |
Correct |
7 ms |
640 KB |
Output is correct |
| 25 |
Correct |
6 ms |
640 KB |
Output is correct |
| 26 |
Correct |
5 ms |
640 KB |
Output is correct |
| 27 |
Correct |
5 ms |
632 KB |
Output is correct |
| 28 |
Correct |
5 ms |
512 KB |
Output is correct |
| 29 |
Correct |
5 ms |
640 KB |
Output is correct |
| 30 |
Correct |
5 ms |
512 KB |
Output is correct |
| 31 |
Correct |
6 ms |
640 KB |
Output is correct |
| 32 |
Correct |
6 ms |
512 KB |
Output is correct |
| 33 |
Correct |
5 ms |
640 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
5 ms |
384 KB |
Output is correct |
| 2 |
Correct |
5 ms |
384 KB |
Output is correct |
| 3 |
Correct |
5 ms |
384 KB |
Output is correct |
| 4 |
Correct |
4 ms |
384 KB |
Output is correct |
| 5 |
Correct |
6 ms |
640 KB |
Output is correct |
| 6 |
Correct |
6 ms |
640 KB |
Output is correct |
| 7 |
Correct |
6 ms |
640 KB |
Output is correct |
| 8 |
Correct |
6 ms |
512 KB |
Output is correct |
| 9 |
Correct |
6 ms |
640 KB |
Output is correct |
| 10 |
Correct |
5 ms |
640 KB |
Output is correct |
| 11 |
Correct |
6 ms |
640 KB |
Output is correct |
| 12 |
Correct |
6 ms |
640 KB |
Output is correct |
| 13 |
Correct |
6 ms |
640 KB |
Output is correct |
| 14 |
Correct |
6 ms |
640 KB |
Output is correct |
| 15 |
Correct |
6 ms |
640 KB |
Output is correct |
| 16 |
Correct |
6 ms |
640 KB |
Output is correct |
| 17 |
Correct |
6 ms |
768 KB |
Output is correct |
| 18 |
Correct |
6 ms |
640 KB |
Output is correct |
| 19 |
Correct |
6 ms |
640 KB |
Output is correct |
| 20 |
Correct |
5 ms |
640 KB |
Output is correct |
| 21 |
Correct |
5 ms |
640 KB |
Output is correct |
| 22 |
Correct |
5 ms |
640 KB |
Output is correct |
| 23 |
Correct |
5 ms |
640 KB |
Output is correct |
| 24 |
Correct |
7 ms |
640 KB |
Output is correct |
| 25 |
Correct |
6 ms |
640 KB |
Output is correct |
| 26 |
Correct |
5 ms |
640 KB |
Output is correct |
| 27 |
Correct |
5 ms |
632 KB |
Output is correct |
| 28 |
Correct |
5 ms |
512 KB |
Output is correct |
| 29 |
Correct |
5 ms |
640 KB |
Output is correct |
| 30 |
Correct |
5 ms |
512 KB |
Output is correct |
| 31 |
Correct |
6 ms |
640 KB |
Output is correct |
| 32 |
Correct |
6 ms |
512 KB |
Output is correct |
| 33 |
Correct |
5 ms |
640 KB |
Output is correct |
| 34 |
Correct |
338 ms |
46712 KB |
Output is correct |
| 35 |
Correct |
315 ms |
47652 KB |
Output is correct |
| 36 |
Correct |
311 ms |
46128 KB |
Output is correct |
| 37 |
Correct |
312 ms |
48432 KB |
Output is correct |
| 38 |
Correct |
309 ms |
48432 KB |
Output is correct |
| 39 |
Correct |
308 ms |
48304 KB |
Output is correct |
| 40 |
Correct |
324 ms |
49516 KB |
Output is correct |
| 41 |
Correct |
300 ms |
48048 KB |
Output is correct |
| 42 |
Correct |
320 ms |
48052 KB |
Output is correct |
| 43 |
Correct |
352 ms |
51820 KB |
Output is correct |
| 44 |
Correct |
341 ms |
51820 KB |
Output is correct |
| 45 |
Correct |
340 ms |
51308 KB |
Output is correct |
| 46 |
Correct |
323 ms |
52076 KB |
Output is correct |
| 47 |
Correct |
314 ms |
50412 KB |
Output is correct |
| 48 |
Correct |
312 ms |
49900 KB |
Output is correct |
| 49 |
Correct |
323 ms |
51908 KB |
Output is correct |
| 50 |
Correct |
339 ms |
49644 KB |
Output is correct |
| 51 |
Correct |
342 ms |
49772 KB |
Output is correct |
| 52 |
Correct |
222 ms |
51436 KB |
Output is correct |
| 53 |
Correct |
208 ms |
51308 KB |
Output is correct |
| 54 |
Correct |
190 ms |
51308 KB |
Output is correct |
| 55 |
Correct |
197 ms |
51308 KB |
Output is correct |
| 56 |
Correct |
323 ms |
52028 KB |
Output is correct |
| 57 |
Correct |
290 ms |
50948 KB |
Output is correct |
| 58 |
Correct |
286 ms |
51164 KB |
Output is correct |
| 59 |
Correct |
298 ms |
51308 KB |
Output is correct |
| 60 |
Correct |
274 ms |
48304 KB |
Output is correct |
| 61 |
Correct |
286 ms |
51292 KB |
Output is correct |
| 62 |
Correct |
283 ms |
50540 KB |
Output is correct |
| 63 |
Correct |
286 ms |
51180 KB |
Output is correct |
| 64 |
Correct |
290 ms |
49712 KB |
Output is correct |
| 65 |
Correct |
284 ms |
51180 KB |
Output is correct |
