Submission #870148

#	Time	Username	Problem	Language	Result	Execution time	Memory
870148		imarn	Pinball (JOI14_pinball)	C++14	100 / 100	162 ms	14800 KiB

pinball

#include<bits/stdc++.h>
#define f first
#define s second
#define ll long long
#define pb push_back
#define pii pair<int,int>
#define pll pair<ll,ll>
#define sz(x) (int)x.size()
#define all(x) x.begin(),x.end()
using namespace std;
const int N=3e5+5;
ll dr[100001]{0},dl[100001]{0};
struct segment{
    ll t[2*N];
    void build(){
        for(int i=0;i<2*N;i++)t[i]=1e16;
    }
    void upd(int i,ll amt,int sz){
        i+=sz;t[i]=min(t[i],amt);
        for(i>>=1;i;i>>=1){
            t[i]=min(t[2*i],t[2*i+1]);
        }
    }
    ll qr(int l,int r,int sz,ll res=1e16){
        for(l+=sz,r+=sz;l<r;l>>=1,r>>=1){
            if(l&1)res=min(res,t[l++]);
            if(r&1)res=min(res,t[--r]);
        }return res;
    }
}tl,tr;
int main(){
  	ios_base::sync_with_stdio(false);cin.tie(NULL);
    int m,n;cin>>m>>n;tl.build();tr.build();
    int a[m],b[m],c[m],d[m];
    for(int i=0;i<m;i++)cin>>a[i]>>b[i]>>c[i]>>d[i];
    vector<int>co;
    for(int i=0;i<m;i++)co.pb(a[i]),co.pb(b[i]),co.pb(c[i]);
    sort(co.begin(),co.end());
    int M=3*m;ll ans=1e16;
    for(int i=0;i<m;i++){
        dl[i]=dr[i]=1e16;
        ll mnl,mnr;mnl=mnr=1e16;
        if(a[i]==1)dl[i]=d[i],mnl=0;
        if(b[i]==n)dr[i]=d[i],mnr=0;
        a[i]=lower_bound(all(co),a[i])-co.begin();
        b[i]=lower_bound(all(co),b[i])-co.begin();
        c[i]=lower_bound(all(co),c[i])-co.begin();
        ll le=tl.qr(a[i],b[i]+1,M);
        ll re=tr.qr(a[i],b[i]+1,M);
        dl[i]=min(dl[i],le+d[i]);
        dr[i]=min(dr[i],re+d[i]);
        mnl=min(mnl,le);mnr=min(mnr,re);
        tl.upd(c[i],dl[i],M);
        tr.upd(c[i],dr[i],M);
        ans=min(ans,mnl+mnr+d[i]);
    }cout<<(ans==1e16?-1:ans);
}

• Subtask 1: 11 / 11
• Subtask 2: 18 / 18
• Subtask 3: 22 / 22
• Subtask 4: 49 / 49