Submission #264789

#	Time	Username	Problem	Language	Result	Execution time	Memory
264789		Goolakh	Building 4 (JOI20_building4)	C++17	11 / 100	2087 ms	23840 KiB

building4

// FUCKED UP FUCKED UP FUCKED UP FUCKED UP FUCKED UP
#include <bits/stdc++.h>
using namespace std;

#pragma GCC optimize("O2,no-stack-protector,unroll-loops,fast-math")

#define F first
#define S second
#define pb push_back
#define SZ(x) (ll)(x.size())
#define all(x) x.begin(),x.end()
#define MP make_pair

typedef int ll;
typedef long double ld;
typedef pair<ll,ll> pll;

//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const ll maxn=1e6+10, maxm=1e6+10, lg=10, mod=1e9+7, inf=1e18;

ll n,a[maxn][2],mn[maxn][2],mx[maxn][2];

int main(){
	ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
	
	for(int i=0;i<maxn;i++) mn[i][0]=mn[i][1]=mod, mx[i][0]=mx[i][1]=-mod;
	cin>>n; n*=2;
	for(int b:{0,1})for(int i=1;i<=n;i++) cin>>a[i][b];
	mn[1][0]=mx[1][0]=0;
	mn[1][1]=mx[1][1]=1;
	for(int i=2;i<=n;i++)for(ll b:{0,1})for(int bb:{0,1})if(a[i][b]>=a[i-1][bb]){
		mn[i][b]=min(mn[i][b],mn[i-1][bb]+b);
		mx[i][b]=max(mx[i][b],mx[i-1][bb]+b);
	}
	ll bb=n/2,gg=mod;
	string ans="";
	for(int i=n;i>=1;i--){
		bool F=0;
		for(int b:{0,1}){
			if(a[i][b]<=gg && mn[i][b]<=bb && bb<=mx[i][b]){
				bb-=b;
				ans=(b ? 'B':'A')+ans;
				gg=a[i][b];
				F=1;
				break;
			}
		}
		if(!F) return cout<<-1,0;
	}
	cout<<ans;
	
	return 0;
}
// a denial a denial a denial a denial a denial a denial

Compilation message (stderr)

building4.cpp:20:58: warning: overflow in conversion from 'double' to 'll' {aka 'int'} changes value from '1.0e+18' to '2147483647' [-Woverflow]
   20 | const ll maxn=1e6+10, maxm=1e6+10, lg=10, mod=1e9+7, inf=1e18;
      |                                                          ^~~~

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