Submission #1033553

#	Time	Username	Problem	Language	Result	Execution time	Memory
1033553		vjudge1	Pinball (JOI14_pinball)	C++17	100 / 100	159 ms	21704 KiB

pinball

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
#define pii pair<int,int>
#define pll pair<ll,ll>
#define fi first
#define se second
const int maxN=1e5+5,LIMIT=1e6+5;
const ll inf=2e18;
int n,m,a[maxN+1],b[maxN+1],c[maxN+1];
ll d[maxN+1],dp[maxN+1],f[maxN+1];
vector<int> cprs;
bool intersect(ll l,ll r,ll mid)
{
    return (l<=mid&&mid<=r);
}
struct segment
{
    ll sum[4*LIMIT+1];
    void Build(int x,int low,int high)
    {
        if(low==high)
        {
            sum[x]=inf;
            return;
        }
        int mid=(low+high)/2;
        Build(2*x,low,mid);
        Build(2*x+1,mid+1,high);
        sum[x]=min(sum[2*x],sum[2*x+1]);
    }
    int pos,l,r;
    ll val;
    void Update(int x,int low,int high)
    {
        if(low==high)
        {
            sum[x]=min(sum[x],val);
            return;
        }
        int mid=(low+high)/2;
        if(pos<=mid)
        {
            Update(2*x,low,mid);
        }
        else Update(2*x+1,mid+1,high);
        sum[x]=min(sum[2*x],sum[2*x+1]);
    }
    void update_val(int pos,ll val)
    {
        this->pos=pos;
        this->val=val;
        Update(1,1,cprs.size());
    }
    ll get(int x,int low,int high)
    {
        if(low>r||high<l)
        {
            return inf;
        }
        if(low>=l&&high<=r)
        {
            return sum[x];
        }
        int mid=(low+high)/2;
        ll get1=get(2*x,low,mid);
        ll get2=get(2*x+1,mid+1,high);
        return min(get1,get2);
    }
    ll query(int l,int r)
    {
        this->l=l;
        this->r=r;
        return get(1,1,cprs.size());
    }
}st1,st2;
int nen(int x)
{
    return lower_bound(cprs.begin(),cprs.end(),x)-cprs.begin()+1;
}
int main()
{
    //freopen("","r",stdin);
    //freopen("","w",stdout);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin>>m>>n;
    for(int i=1;i<=m;i++)
    {
        cin>>a[i]>>b[i]>>c[i]>>d[i];
        cprs.push_back(a[i]);
        cprs.push_back(b[i]);
        cprs.push_back(c[i]);
        dp[i]=inf;
        f[i]=inf;
    }
    cprs.push_back(1);
    cprs.push_back(n);
    sort(cprs.begin(),cprs.end());
    cprs.resize(unique(cprs.begin(),cprs.end())-cprs.begin());
    for(int i=1;i<=m;i++)
    {
        a[i]=nen(a[i]);
        b[i]=nen(b[i]);
        c[i]=nen(c[i]);
    }
    st1.Build(1,1,cprs.size());
    st2.Build(1,1,cprs.size());
    st1.update_val(nen(1),0);
    st2.update_val(nen(n),0);
    dp[0]=0;
    f[0]=0;
    for(int i=1;i<=m;i++)
    {
        ll tmp1=st1.query(a[i],b[i]);
        ll tmp2=st2.query(a[i],b[i]);
        dp[i]=min(dp[i],tmp1+d[i]);
        f[i]=min(f[i],tmp2+d[i]);
        st1.update_val(c[i],dp[i]);
        st2.update_val(c[i],f[i]);
        //cout<<i<<" "<<dp[i]<<" "<<f[i]<<'\n';
    }
    ll ans=inf;
    for(int i=1;i<=m;i++)
    {
        ans=min(ans,dp[i]+f[i]-d[i]);
    }
    if(ans==inf)
    {
        cout<<-1;
    }
    else cout<<ans;
}

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