Codeforces Round #386 (Div. 2), problem: (F) Music in Car Solution in C/C++

Codeforces Round #386 (Div. 2), problem: (F) Music in Car Solution in C/C++

#include <stdio.h>
#include <string.h>
#define MAX(X,Y) ((X)>(Y) ? (X) : (Y))

int n,w,k,a[200010],t[200010],sz[2],heap[2][200010],ind[200010],pos[200010];
void push(int k,int opt);
int pop(int opt);
void del(int u,int opt);
void up(int u,int opt);
void down(int u,int opt);
int cmp(int u,int v,int opt);
void swap(int u,int v,int opt);

int main(void)
{
    //freopen("music.in","r",stdin);
    //freopen("music.out","w",stdout);
    scanf("%d%d%d",&n,&w,&k);
    int i;
    for(i=1;i<=n;i++)
        scanf("%d",&a[i]);
    for(i=1;i<=n;i++)
        scanf("%d",&t[i]);
    sz[0]=sz[1]=0;
    memset(pos,-1,sizeof(pos));
    int l=1,s=0,st=0,ans=0,p;
    for(sz[0]=sz[1]=0,i=1;i<=n;i++)
    {
        push(i,0);
        s+=a[i];  st+=(t[i]+1)/2;
        if(sz[0]>w)
        {
            p=pop(0);
            st-=(t[p]+1)/2;
            push(p,1);
            st+=t[p];
        }
        while(st>k)
        {
            if(pos[l])
            {
                del(ind[l],1);
                s-=a[l];  st-=t[l];
            }
            else
            {
                del(ind[l],0);
                s-=a[l];  st-=(t[l]+1)/2;
                if(sz[1])
                {
                    p=pop(1);
                    st-=t[p];
                    push(p,0);
                    st+=(t[p]+1)/2;
                }
            }
            l++;
        }
        ans=MAX(ans,s);
    }
    printf("%d\n",ans);
    return 0;
}

void push(int k,int opt)
{
    heap[opt][++sz[opt]]=k;
    pos[k]=opt;  ind[k]=sz[opt];
    up(sz[opt],opt);
}

int pop(int opt)
{
    int ans=heap[opt][1];
    swap(1,sz[opt],opt);
    sz[opt]--;
    down(1,opt);
    return ans;
}

void del(int u,int opt)
{
    swap(u,sz[opt],opt);
    sz[opt]--;
    if( u>1 && cmp(u,u/2,opt)<0 ) up(u,opt);
    else down(u,opt);
}

void up(int u,int opt)
{
    if( u>1 && cmp(u,u/2,opt)<0 )
    {
        swap(u,u/2,opt);
        up(u/2,opt);
    }
}

void down(int u,int opt)
{
    if(u*2>sz[opt]) return;
    int v=u*2;
    if( v+1<=sz[opt] && cmp(v+1,v,opt)<0 ) v++;
    if(cmp(v,u,opt)<0)
    {
        swap(u,v,opt);
        down(v,opt);
    }
}

int cmp(int u,int v,int opt)
{
    int ans;
    if(t[heap[opt][u]]<t[heap[opt][v]]) ans=-1;
    else if(t[heap[opt][u]]>t[heap[opt][v]]) ans=1;
    else ans=0;
    if(opt) ans*=-1;
    return ans;
}

void swap(int u,int v,int opt)
{
    int t1,t2;
    t1=heap[opt][u];  t2=heap[opt][v];
    heap[opt][u]=t2;  heap[opt][v]=t1;
    ind[t2]=u;  ind[t1]=v;
}

Codeforces Round #386 (Div. 2), problem: (F) Music in Car Solution in C/C++

#include <stdio.h>
#include <string.h>
#define MAX(X,Y) ((X)>(Y) ? (X) : (Y))

int n,w,k,a[200010],t[200010],sz[2],heap[2][200010],ind[200010],pos[200010];
void push(int k,int opt);
int pop(int opt);
void del(int u,int opt);
void up(int u,int opt);
void down(int u,int opt);
int cmp(int u,int v,int opt);
void swap(int u,int v,int opt);

int main(void)
{
    //freopen("music.in","r",stdin);
    //freopen("music.out","w",stdout);
    scanf("%d%d%d",&n,&w,&k);
    int i;
    for(i=1;i<=n;i++)
        scanf("%d",&a[i]);
    for(i=1;i<=n;i++)
        scanf("%d",&t[i]);
    sz[0]=sz[1]=0;
    memset(pos,-1,sizeof(pos));
    int l=1,s=0,st=0,ans=0,p;
    for(sz[0]=sz[1]=0,i=1;i<=n;i++)
    {
        push(i,0);
        s+=a[i];  st+=(t[i]+1)/2;
        if(sz[0]>w)
        {
            p=pop(0);
            st-=(t[p]+1)/2;
            push(p,1);
            st+=t[p];
        }
        while(st>k)
        {
            if(pos[l])
            {
                del(ind[l],1);
                s-=a[l];  st-=t[l];
            }
            else
            {
                del(ind[l],0);
                s-=a[l];  st-=(t[l]+1)/2;
                if(sz[1])
                {
                    p=pop(1);
                    st-=t[p];
                    push(p,0);
                    st+=(t[p]+1)/2;
                }
            }
            l++;
        }
        ans=MAX(ans,s);
    }
    printf("%d\n",ans);
    return 0;
}

void push(int k,int opt)
{
    heap[opt][++sz[opt]]=k;
    pos[k]=opt;  ind[k]=sz[opt];
    up(sz[opt],opt);
}

int pop(int opt)
{
    int ans=heap[opt][1];
    swap(1,sz[opt],opt);
    sz[opt]--;
    down(1,opt);
    return ans;
}

void del(int u,int opt)
{
    swap(u,sz[opt],opt);
    sz[opt]--;
    if( u>1 && cmp(u,u/2,opt)<0 ) up(u,opt);
    else down(u,opt);
}

void up(int u,int opt)
{
    if( u>1 && cmp(u,u/2,opt)<0 )
    {
        swap(u,u/2,opt);
        up(u/2,opt);
    }
}

void down(int u,int opt)
{
    if(u*2>sz[opt]) return;
    int v=u*2;
    if( v+1<=sz[opt] && cmp(v+1,v,opt)<0 ) v++;
    if(cmp(v,u,opt)<0)
    {
        swap(u,v,opt);
        down(v,opt);
    }
}

int cmp(int u,int v,int opt)
{
    int ans;
    if(t[heap[opt][u]]<t[heap[opt][v]]) ans=-1;
    else if(t[heap[opt][u]]>t[heap[opt][v]]) ans=1;
    else ans=0;
    if(opt) ans*=-1;
    return ans;
}

void swap(int u,int v,int opt)
{
    int t1,t2;
    t1=heap[opt][u];  t2=heap[opt][v];
    heap[opt][u]=t2;  heap[opt][v]=t1;
    ind[t2]=u;  ind[t1]=v;
}

More from author

LEAVE A REPLY

Please enter your comment!
Please enter your name here

Related posts

Advertismentspot_img

Latest posts

Flock Forces Website Showing Camera Locations To Shut Down, Because ‘Transparency Matters’

In an era where digital surveillance grows increasingly ubiquitous, Flock Safety has established itself as a major player in automated license plate reader (ALPR)...

Why Viral Kitchen Gadgets Is Currently Breaking the Internet

📢 As an Amazon Associate, I earn from qualifying purchases.I stumbled across this while desperately trying to fix a recurring problem in my routine....

7 Reasons This Viral Kitchen Gadgets Is Worth Every Single Penny

📢 As an Amazon Associate, I earn from qualifying purchases.If you had told me six months ago that a single purchase would change how...

Want to stay up to date with the latest news?

We would love to hear from you! Please fill in your details and we will stay in touch. It's that simple!