Submission #1140620

#	Time	Username	Problem	Language	Result	Execution time	Memory
1140620		ghammazhassan	Sprinklers (CEOI24_sprinklers)	C++20	3 / 100	15 ms	2376 KiB

Main

// #include <bits/stdc++.h>
#include <iostream>
#include <cmath>
#include <algorithm>
#include <map>
#include <vector>
#include <iomanip>
#include <string>
#include <queue>
#include <set>
#include <deque>
using namespace std;
#define int long long
#define endl "\n";
const int N=2e5+5;
const int M=1e9+7;
void solve()
{
	int n,m;
	cin >> n >> m;
	vector<int>a(n),b(m);
	for (int i=0;i<n;i++){
		cin >> a[i];
	}
	for (int i=0;i<m;i++){
		cin >> b[i];
	}
	if (n==1 and a[0]>b[0] and a[0]<b[m-1]){
		cout << -1 << endl;
		return;
	}
	else if (n==1){
		if (a[0]>b[0]){
			cout << a[0]-b[0] << endl;
			cout << 'L' << endl;
		}
		else{
			cout << b[m-1]-a[0] << endl;
			cout << 'R' << endl;
		}
		return;
	}
	
	int l=0;
	int h=b[m-1]+1;
	int mi=(l+h)/2;
	vector<pair<int,string>>q;
	while (l<h){
		int i=0;
		queue<int>o;
		for (int j:b){
			o.push(j);
		}
		string s;
		for (int j:a){
			s+='W';
		}
		while (!o.empty()){
			if (i>=n){
				break;
			}
			int he=o.front();
			while (!o.empty() and a[i]<o.front()){
				he =o.front();
				if (he<=a[i]+mi and he>=a[i]){
					o.pop();
					s[i]='R';
				}
				else if (i!=n-1){
					s[i]='R';
					i++;
				}
				else{
					break;
				}
			}
			if (o.empty()){
				continue;
			}
			he=o.front();
			int f=he+mi;
			while (i<n-1 and a[i+1]<=f){
				s[i]='R';
				i++;
			}
			if (s[i]=='R'){
				break;
			}
			s[i]='L';
			while (!o.empty()){
				he =o.front();
				if (he>=a[i]-mi and he<=a[i]){
					o.pop();
				}
				else{
					break;
				}
			}
			i++;
		}
		// cout << mi << " " << s << endl;
		for (int i=0;i<n;i++){
			if (s[i]!='L'){
				s[i]='R';
			}
		}
		q.push_back({mi,s});
		i=0;
		while (!o.empty()){
			int he=o.front();
			if ((he>=a[i]-mi and he<=a[i] and s[i]=='L') or (he<=a[i]+mi and he>=a[i] and s[i]=='R')){
				o.pop();
			}
			else if (i!=n-1){
				i++;
			}
			else{
				break;
			}
		}
		if (o.empty()){
			h=mi;
		}
		else{
			l=mi+1;
		}
		mi=(l+h)/2;
	}
	for (auto i:q){
		if (i.first==mi){
			cout << mi <<endl;
			cout << i.second << endl;
			break;
		}
	}
	
}
signed main()
{

    ios::sync_with_stdio(0);//DO NOT USE IN INTERACTIVE
    cin.tie(0), cout.tie(0);//DO NOT USE IN INTERACTIVE
    cout << fixed<<setprecision(9);
    int t=1;
    // cin >> t;
    for (int _=1;_<=t;_++){
    	solve();
    }
}

• Subtask 0: 0 / 0
• Subtask 1: 3 / 3
• Subtask 2: 0 / 6
• Subtask 3: 0 / 17
• Subtask 4: 0 / 27
• Subtask 5: 0 / 47