Submission #1044371

#	Time	Username	Problem	Language	Result	Execution time	Memory
1044371		imarn	Sprinklers (CEOI24_sprinklers)	C++14	9 / 100	33 ms	3764 KiB

Main

#include<bits/stdc++.h>
#define ll long long
#define pb push_back
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define ub(a,b) upper_bound(a.begin(),a.end(),b)-a.begin();
#define lb(a,b) lower_bound(a.begin(),a.end(),b)-a.begin();
#define vi vector<int>
#define vll vector<ll>
#define pll pair<ll,ll>
#define sz(x) x.size()
#define T pair<double,string>
using namespace std;
const int mxn=2e5+5;
int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);
    int n,m;cin>>n>>m;
    ll s[n+1],f[m+1];
    for(int i=1;i<=n;i++)cin>>s[i];
    for(int i=1;i<=m;i++)cin>>f[i];
    ll l=0,r=1e12+1;
    int lr[n+1]={0};
    while(l<r){
        ll k=(l+r)>>1;
        int idx=1;memset(lr,0,sizeof lr);
        for(int i=1;i<=n;i++){
            while(idx<=m&&s[i]-k<=f[idx]&&f[idx]<s[i])idx++,lr[i]=1;
            while(f[idx]==s[i])idx++;
            while(idx<=m&&s[i]<=f[idx]&&f[idx]<=s[i]+k&&lr[i]!=1)idx++,lr[i]=2;
        }if(idx!=m+1)l=k+1;
        else r=k;
    }if(l==1e12+1){cout<<-1;return 0;}
    memset(lr,0,sizeof lr);int idx=1;
    for(int i=1;i<=n;i++){
        while(idx<=m&&s[i]-l<=f[idx]&&f[idx]<s[i])idx++,lr[i]=1;
        while(idx<=m&&s[i]<=f[idx]&&f[idx]<=s[i]+l&&lr[i]!=1)idx++,lr[i]=2;
        if(idx==m+1&&!lr[i])lr[i]=2;
    }cout<<l<<'\n';
    for(int i=1;i<=n;i++)cout<<(lr[i]==1?"L":"R");
}

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