Submission #264799

#	Time	Username	Problem	Language	Result	Execution time	Memory
264799		Goolakh	Building 4 (JOI20_building4)	C++17	100 / 100	448 ms	45744 KiB

building4

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

#pragma GCC optimize("O2")

#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[2][maxn],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;
	scanf("%d",&n); n*=2;
	for(int b=0;b<2;b++)for(int i=1;i<=n;i++) scanf("%d",&a[b][i]);
	mn[1][0]=mx[1][0]=0;
	mn[1][1]=mx[1][1]=1;
	for(int i=2;i<=n;i++)for(int b=0;b<2;b++)for(int bb=0;bb<2;bb++)if(a[b][i]>=a[bb][i-1]){
		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;b<2;b++){
			if(a[b][i]<=gg && mn[i][b]<=bb && bb<=mx[i][b]){
				bb-=b;
				ans+=(b ? 'B':'A');
				gg=a[b][i];
				F=1;
				break;
			}
		}
		if(!F) return cout<<-1,0;
	}
	reverse(all(ans));
	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;
      |                                                          ^~~~
building4.cpp: In function 'int main()':
building4.cpp:28:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   28 |  scanf("%d",&n); n*=2;
      |  ~~~~~^~~~~~~~~
building4.cpp:29:49: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   29 |  for(int b=0;b<2;b++)for(int i=1;i<=n;i++) scanf("%d",&a[b][i]);
      |                                            ~~~~~^~~~~~~~~~~~~~~

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