Submission #1364298

#	Time	Username	Problem	Language	Result	Execution time	Memory
1364298		Aviansh	Sprinklers (CEOI24_sprinklers)	C++20	9 / 100	30 ms	2172 KiB

Main

#include <bits/stdc++.h>

using namespace std;

#define int long long

signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    int n,m;
    cin >> n >> m;
    int s[n];
    for(int i = 0;i<n;i++){
        cin >> s[i];
    }
    int f[m];
    for(int i = 0;i<m;i++){
        cin >> f[i];
    }
    sort(f,f+m);
    sort(s,s+n);
    char ans[n];
    auto check = [&] (int k){
        //n sprinklers, m flowers both sorted
        int ind = 0;
        //default
        fill(ans,ans+n,'L');
        for(int i = 0;i<n;i++){
            //ind is to be covered
            if(ind>=m)
                break;
            if(abs(f[ind]-s[i])>k){
                //cant be covered continue
                continue;
            }
            //can be covered
            if(f[ind]<s[i]){
                //must go left
                while(ind<m&&f[ind]<=s[i]){
                    ind++;
                }
                //ind reseted
            }
            else{
                //must go right
                ans[i]='R';
                while(ind<m&&f[ind]<=s[i]+k){
                    ind++;
                }
                //ind reset
            }
        }
        if(ind>=m){
            return 1;
        }
        return 0;
    };
    int lo = 0;
    int hi = 2e9;
    while(lo<hi){
        int mid = (lo+hi)/2;
        if(check(mid)){
            hi=mid;
        }
        else{
            lo=mid+1;
        }
    }
    if(lo==2e9){
        cout << -1;
        return 0;
    }
    check(lo);
    cout << lo << "\n";
    for(char c:ans){
        cout << c;
    }
    return 0;
}

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