Submission #972867

#	Time	Username	Problem	Language	Result	Execution time	Memory
972867		modwwe	Building 4 (JOI20_building4)	C++17	0 / 100	1 ms	2408 KiB

building4

#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx,avx2,sse,sse2")
#include<bits/stdc++.h>
#define int long long
//#define ll long long
#define down cout<<'\n';
#define NHP     ios_base::sync_with_stdio(0);cout.tie(0);cin.tie(0);
#define modwwe  int t;cin>>t; while(t--)
#define bit(i,j) (i>>j&1)
#define sobit(a) __builtin_popcountll(a)
#define task "test"
#define fin(x) freopen(x".inp","r",stdin)
#define fou(x) freopen(x".out","w",stdout)
#define pb push_back
#define checktime   cerr << (double)clock() / CLOCKS_PER_SEC * 1000  << " ms";
using namespace std;
void ngha();
const int mod2=1e9+7;
const int  mod1=998244353;
struct ib
{
    int a;
    int b;
};
struct icd
{
    int a,b;
};
struct ic
{
    int a,b,c;
};
struct id
{
    int a,b,c,d;
};
struct ie
{
    int a,b,c, d,e;

};
int n,m,s1,s2,s4,s3,sf,k,r,mid,s5,s6,mx,s7,s8,s9,mx2,res,dem2=0,dem=0,l;
int  i,s10,s12;
int el=29;
main()
{
//#ifndef ONLINE_JUDGE
    /// fin(task),fou(task);
//#endif
//NHP
//modwwe
    //  cin>>res;
    ngha(),down
    checktime
}
ib dp[500001][2];
int a[500001][2];
void solve(int x,int y,int z)
 {
     if(x==0) return;
      if(y==0)z--, cout<<"A";
      else    cout<<"B";
     if(dp[x-1][1].a>=z&&dp[x-1][1].b<=z) solve(x-1,1,z);
      solve(x-1,0,z);
 }
void ngha()
{
     cin>>n;
     for(int i=2*n;i>=1;i--)cin>>a[i][0];
         for(int i=2*n;i>=1;--i)cin>>a[i][1];
         a[0][1]=a[0][0]=1e9+2;
for(int i=1;i<=n*2;i++)
for(int j=0;j<2;j++){ dp[i][j]={0,2*n+1};
    for(int z=0;z<2;z++)
    if(a[i][j]<=a[i-1][z]){
    dp[i][j].a=max(dp[i][j].a,dp[i-1][z].a+1-j),
    dp[i][j].b=min(dp[i][j].b,dp[i-1][z].b+1-j);}/// xet tung o thi so cot A duoc lay nhieu nhat va lon nhat la bao nhieu
    }
    if(dp[2*n][0].a>=n&&dp[2*n][0].b<=n)solve(2*n,0,n);
        else if(dp[2*n][1].a>=n&&dp[2*n][1].b<=n) solve(2*n,0,n);
        else cout<<-1;
}

Compilation message (stderr)

building4.cpp:45:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   45 | main()
      | ^~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 89