3 条题解

  • 0
    @ 2023-3-25 17:46:09
    #include<bits/stdc++.h>
    using namespace std;
    typedef long long int ll;
    typedef long double ld;
    const int maxn=5E5+5;
    const int base=33333;
    const ld eps=1E-10;
    const ld inf=1E17;
    int n,m,T;
    ll a[maxn],b[maxn],ans[maxn];
    int idR[maxn],idL[maxn];
    ld rightPlane[maxn],leftPlane[maxn];
    int q[maxn];
    struct pt
    {
    double x,y;
    pt(double a=0,double b=0):x(a),y(b){}
    pt operator+(const pt&A){return pt(x+A.x,y+A.y);}
    pt operator-(const pt&A){return pt(x-A.x,y-A.y);}
    pt operator*(ld d){return pt(x*d,y*d);}
    double operator*(const pt&A){return x*A.y-y*A.x;}
    void out(){cout<<"("<<x<<","<<y<<")"<<endl;}
    };
    struct line
    {
    pt A,B;
    int id,b;
    int slope;
    line(){}
    line(pt a,pt b):A(a),B(b){}
    }s[maxn];
    inline ll max(ll x,ll y)
    {
    return x>y?x:y;
    }
    inline ll min(ll x,ll y)
    {
    return x<y?x:y;
    }
    inline ll get(ll x,ll a,ll b)
    {
    return (a*x+b)*x;
    }
    inline int read()
    {
    bool flag=0;
    char ch=getchar();
    if(ch=='-')
    flag^=1;
    while(!isdigit(ch))
    {
    ch=getchar();
    if(ch=='-')
    flag^=1;
    }
    int sum=ch-'0';
    ch=getchar();
    while(isdigit(ch))
    {
    sum=sum*10+ch-'0';
    ch=getchar();
    }
    return flag?-sum:sum;
    }
    void write(ll x)
    {
    if(x>=10)
    write(x/10);
    putchar('0'+x%10);
    }
    inline void writen(ll x)
    {
    if(x<0)
    {
    putchar('-');
    write(-x);
    }
    else
    write(x);
    putchar('\n');
    }
    inline int cross(pt A,pt B)
    {
    ld d=A*B;
    if(abs(d)<=eps)
    return 0;
    return d>0?1:-1;
    }
    inline pt intersection(line a,line b)
    {
    pt A=b.B-b.A,B=a.B-a.A,C=b.A-a.A;
    if(cross(A,B)==0)
    return pt(inf,inf);
    ld d=-(B*C)/(B*A);
    return b.A+A*d;
    }
    inline int onClockwise(line a,line b,line c)
    {
    return cross(a.B-a.A,intersection(b,c)-a.A)==-1;
    }
    bool cmpR(line A,line B)
    {
    if(A.slope==B.slope)
    return A.b<B.b;
    return A.slope<B.slope;
    }
    bool cmpL(line A,line B)
    {
    if(A.slope==B.slope)
    return A.b>B.b;
    return A.slope<B.slope;
    }
    void initR()
    {
    sort(s+1,s+n+1,cmpR);
    int L=1,R=0;
    for(int i=1;i<=n;++i)
    {
    while(i!=n&&s[i].slope==s[i+1].slope)
    ++i;
    while(R-1>=L&&onClockwise(s[i],s[q[R]],s[q[R-1]]))
    --R;
    q[++R]=i;
    }
    for(int i=1;i<=R;++i)
    idR[i]=s[q[i]].id;
    for(int i=1;i<R;++i)
    rightPlane[i]=intersection(s[q[i]],s[q[i+1]]).x;
    int pos=1;
    for(int i=-base;i<=base;++i)
    {
    while(pos<R&&rightPlane[pos]<ld(i))
    ++pos;
    ans[i+base]=get(i,s[q[pos]].slope,s[q[pos]].b);
    }
    }
    void initL()
    {
    sort(s+1,s+n+1,cmpL);
    int L=1,R=0;
    for(int i=1;i<=n;++i)
    {
    while(i!=n&&s[i].slope==s[i+1].slope)
    ++i;
    while(R-1>=L&&onClockwise(s[i],s[q[R]],s[q[R-1]]))
    --R;
    q[++R]=i;
    }
    for(int i=1;i<=R;++i)
    idL[i]=s[q[i]].id;
    for(int i=1;i<R;++i)
    leftPlane[i]=intersection(s[q[i]],s[q[i+1]]).x;
    int pos=1;
    for(int i=base;i>=-base;--i)
    {
    while(pos<R&&ld(i)<leftPlane[pos])
    ++pos;
    ans[i+base]=max(ans[i+base],get(i,s[q[pos]].slope,s[q[pos]].b));
    }
    }
    int main()
    {
    //    freopen("A.in","r",stdin);
    //    freopen("A.out","w",stdout);
    ios::sync_with_stdio(false);
    n=read(),T=read();
    for(int i=1;i<=n;++i)
    {
    a[i]=read(),b[i]=read();
    s[i].A=pt(0,b[i]);
    s[i].B=pt(1,a[i]+b[i]);
    s[i].slope=a[i];
    s[i].b=b[i];
    s[i].id=i;
    }
    initR();
    for(int i=1;i<=n;++i)
    swap(s[i].A,s[i].B);
    initL();
    while(T--)
    {
    int x=read();
    writen(ans[x+base]);
    }
    return 0;
    }
    
    

    信息

    ID
    54
    时间
    1000ms
    内存
    256MiB
    难度
    5
    标签
    (无)
    递交数
    137
    已通过
    42
    上传者