Submission #1364341

#	Time	Username	Problem	Language	Result	Execution time	Memory
1364341		Aviansh	Sprinklers (CEOI24_sprinklers)	C++20	20 / 100	2095 ms	2060 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];
    }
    char ans[n];
    auto check = [&] (int k){
        for(int mask = 0;mask<(1<<n);mask++){
            int cnt[m];
            fill(cnt,cnt+m,0);
            for(int i = 0;i<n;i++){
                if(mask&(1<<i)){
                    //go right
                    int lo = s[i];
                    int ind = lower_bound(f,f+m,lo)-f;
                    while(ind<m&&f[ind]<=s[i]+k){
                        cnt[ind]++;
                        ind++;
                    }
                }
                else{
                    //go left
                    int lo = s[i]-k;
                    int ind = lower_bound(f,f+m,lo)-f;
                    while(ind<m&&f[ind]<=s[i]){
                        cnt[ind]++;
                        ind++;
                    }
                }
            }
            if((*min_element(cnt,cnt+m))==0){
            }
            else{
                for(int i = 0;i<n;i++){
                    if((1<<i)&(mask)){
                        //go right
                        ans[i]='R';
                    }
                    else{
                        //go left
                        ans[i]='L';
                    }
                }
                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: 0 / 6
• Subtask 3: 17 / 17
• Subtask 4: 0 / 27
• Subtask 5: 0 / 47