Submission #937405

#	Time	Username	Problem	Language	Result	Execution time	Memory
937405		sleepntsheep	Rigged Roads (NOI19_riggedroads)	C11	100 / 100	634 ms	82004 KiB

riggedroads

#include<stdio.h>
#include<stdlib.h>
#include<string.h>

#define N 300005
int t[N<<2], lz[N<<2];
void push(int v, int l, int r)
{
    if (~lz[v])
    {
        if (l != r) lz[2*v+1] = lz[2*v+2] = lz[v];
        t[v] = lz[v]*(r-l+1);
        lz[v] = -1;
    }
}

void upd(int v, int l, int r, int x, int y, int k)
{
    push(v, l, r);
    if (r < x||y<l)return;
    if(x<=l&&r<=y){lz[v]=k;push(v,l,r);return;}
    upd(2*v+1, l,(l+r)/2,x,y,k),upd(2*v+2,(l+r)/2+1,r,x,y,k);
    t[v]=t[2*v+1]+t[2*v+2];
}

int qry(int v,int l,int r,int x,int y)
{
    push(v,l,r);
    if(r<x||y<l)return 0;
    if(x<=l&&r<=y)return t[v];
    return qry(2*v+1,l,(l+r)/2,x,y)+qry(2*v+2, (l+r)/2+1, r, x,y);
}

int lo(int a,int b){return a<b?a:b;}

int t2[N<<2];
void u2(int l,int r,int k){
    for(l+=N,r+=N+1;l<r;l>>=1,r>>=1){
        if(l&1)t2[l]=lo(k,t2[l]),++l;
        if(r&1)--r,t2[r]=lo(t2[r],k);
    }
}
int q2(int p){
    int z=1e8;
    for(p+=N;p;p>>=1)z=lo(z,t2[p]);
    return z;
}

int n,m,h[N],e[N<<1][2],ne=1,y[N],P[19][N],dd[N],ch[N],ci[N],timer=0,w[N],ee[N],eee[N],sz[N];
void _l(int u,int v){e[++ne][0]=v,e[ne][1]=h[u],h[u]=ne;}

void dfs(int u,int p){
    P[0][u]=p;
        for(int j=1;j<19;++j)P[j][u]=P[j-1][P[j-1][u]];
    sz[u]=1;
    for(int v,j=h[u];j;j=e[j][1])if((v=e[j][0])!=p&&y[j>>1]){
        dd[v]=dd[u]+1;
        ee[v]=j>>1;
        eee[j>>1]=v;
        dfs(v,u);
        sz[u]+=sz[v];
    }
}

void hld(int u,int hh)
{
    int hv=0;
    for(int v,j=h[u];j;j=e[j][1])if((v=e[j][0])!=P[0][u]&&y[j>>1]) if(sz[v]>sz[hv])hv=v;
    ci[u]=timer++;ch[u]=hh;
    if(hv)hld(hv,hh);
    for(int v,j=h[u];j;j=e[j][1])if((v=e[j][0])!=P[0][u]&&y[j>>1]&&v!=hv) hld(v,v);
}

int qq(int u,int v){
    if(dd[u]>dd[v])return qq(v,u);
    int dt=dd[v]-dd[u];
    for(int j=19;j--;)if(dt&(1<<j))v=P[j][v];
    if(u==v)return u;
    for(int j=19;j--;)if(P[j][u]^P[j][v])u=P[j][u],v=P[j][v];
    return P[0][u];
}

int anc(int u,int d)
{
    for(int j=19;j--;)if(dd[P[j][u]]>=d)u=P[j][u];
    return u;
}

int need[N],np,ord=1;

int cup(int u,int a)
{
    int z=0;
    for(;ch[u]!=ch[a];u=P[0][ch[u]])
        z+=qry(0,0,n,ci[ch[u]],ci[u]);
    z+=qry(0,0,n,ci[a],ci[u]);
    return z;
}

void sup(int u,int a,int k)
{
    for(;ch[u]!=ch[a];u=P[0][ch[u]])
        upd(0,0,n,ci[ch[u]],ci[u],0),
        u2(ci[ch[u]],ci[u],k);
    upd(0,0,n,ci[a],ci[u],0);
    u2(ci[a],ci[u],k);
}

int *eh[N],eo[N],use[N];
void append(int i,int j) {
    int o=eo[i]++;
    if(o>=2&&(o&(o-1))==0)eh[i]=(int*)realloc(eh[i],2*o*sizeof**eh);
    eh[i][o]=j;
}

int main(){
    memset(lz,-1,sizeof lz);
    memset(t2,63,sizeof t2);

    scanf("%d%d",&n,&m);
    for(int u,v,i=1;i<=m;++i)scanf("%d%d",&u,&v),_l(u,v),_l(v,u);
    for(int j,i=1;i<n;++i)scanf("%d",&j),y[j]=1;
    dfs(1,1),hld(1,1);

    upd(0,0,n,0,n,1);
    upd(0,0,n,ci[1],ci[1],0);
    u2(0,n,1e8);

    for(int j=1;j<=m;++j){
        int u=e[j*2][0],v=e[j*2+1][0];
        if(dd[v]+1==dd[u]){int t=u;u=v;v=t;}
        if(!y[j]){
            int lca=qq(u,v),uk=anc(u,dd[lca]+1),vk=anc(v,dd[lca]+1);
            if(u-lca)ord+=cup(u,uk),sup(u,uk,j);
            if(v-lca)ord+=cup(v,vk),sup(v,vk,j);

            use[w[j]=ord++]=1;
        }else
            if(qry(0,0,n,ci[v],ci[v])){
                use[w[j]=ord++]=1;
                upd(0,0,n,ci[v],ci[v],0);
                u2(ci[v],ci[v],-1);
            }
    }

    for(int i=0;i<=m+1;++i)eh[i]=(int*)malloc(2*sizeof**eh);
    for(int j=1;j<=m;++j) if(!w[j]) append(q2(ci[eee[j]]),j);

    int ord2=1;
    for(int j=0;j<=m+1;++j){
        for(int i=0;i<eo[j];++i){
            while(use[ord2])++ord2;
            w[eh[j][i]]=ord2++;
        }
    }

    for(int j=1;j<=m;++j)printf("%d ",w[j]);
}

Compilation message (stderr)

riggedroads.c: In function 'main':
riggedroads.c:120:5: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  120 |     scanf("%d%d",&n,&m);
      |     ^~~~~~~~~~~~~~~~~~~
riggedroads.c:121:30: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  121 |     for(int u,v,i=1;i<=m;++i)scanf("%d%d",&u,&v),_l(u,v),_l(v,u);
      |                              ^~~~~~~~~~~~~~~~~~~
riggedroads.c:122:27: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  122 |     for(int j,i=1;i<n;++i)scanf("%d",&j),y[j]=1;
      |                           ^~~~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 19 / 19
• Subtask 3: 9 / 9
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 12 / 12
• Subtask 7: 32 / 32