Submission #676626

#	Time	Username	Problem	Language	Result	Execution time	Memory
676626		ensonlung	Building 4 (JOI20_building4)	C++17	0 / 100	2067 ms	14272 KiB

building4

#include <bits/stdc++.h>
using namespace std;
int n,a[200005],b[200005];
string s;
void dfs(int id,int as,int bs,string conf){
	if (id==2*n){
		cout<<conf<<"\n";
		exit(0);
	}
	int tmp=0;
	if (conf[id-1]=='A') tmp=a[id];
	else tmp=b[id]; 
	if (as<n && a[id+1]>=tmp) dfs(id+1,as+1,bs,conf+'A');
	if (bs<n && b[id+1]>=tmp) dfs(id+1,as,bs+1,conf+'B');
}
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0); cout.tie(0);
	cin>>n;
	for (int i=1;i<=2*n;i++) cin>>a[i];
	for (int i=1;i<=2*n;i++) cin>>b[i];
	dfs(1,1,0,"A");
	dfs(1,0,1,"B");
	cout<<"-1\n";
	return 0;
}

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