Submission #866029

#	Time	Username	Problem	Language	Result	Execution time	Memory
866029		phoenix0423	Building 4 (JOI20_building4)	C++17	0 / 100	0 ms	348 KiB

building4

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pll;
#define fastio ios::sync_with_stdio(false), cin.tie(0)
// #pragma GCC optimize("Ofast")
#define pb push_back
#define eb emplace_back
#define f first
#define s second
#define lowbit(x) x&-x
const int maxn = 2e5 + 5;
const int INF = 1e9;
int n, Q;

int main(void){
	fastio;
	int n;
	cin>>n;
	n *= 2;
	vector<int> a(n), b(n);
	for(int i = 0; i < n; i++) cin>>a[i];
	for(int i = 0; i < n; i++) cin>>b[i];
	int pre = 0;
	string ans = "";
	for(int i = 0; i < n; i++){
		if(pre > a[i] && pre > b[i]){
			cout<<-1<<"\n";
			return 0;
		}
		if(a[i] < b[i]){
			if(pre <= a[i]) pre = a[i], ans += 'A';
			else pre = b[i], ans += 'B';
		}
		else{
			if(pre <= b[i]) pre = b[i], ans += 'B';
			else pre = a[i], ans += 'A';
		}
	}
	cout<<ans<<"\n";
}

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