Submission #937238

#TimeUsernameProblemLanguageResultExecution timeMemory
937238sleepntsheepRigged Roads (NOI19_riggedroads)C++17
0 / 100
2061 ms24148 KiB
#include<stdio.h> int hi(int a,int b){return a>b?a:b;} unsigned X=12345;int rand_(){return(X*=3)>>1;} int(*compar)(int,int);void sort(int*aa,int l,int r){ while(l<r){ int i=l,j=l,k=r,t,p=aa[l+rand_()%(r-l)]; while(j<k)switch(compar(aa[j],p)){case 0:++j;break;case -1:t=aa[i],aa[i]=aa[j],aa[j]=t,++i,++j;break;case 1:t=aa[--k],aa[k]=aa[j],aa[j]=t;break;}sort(aa,l,i);l=k; }} #define N 300005 int ttt[N],n,m,h[N],e[N<<1][2],ne=1,y[N],id,pp[N],jj[N],ee[N],dd[N],w[N],tin[N],tout[N],timer=1; void _l(int u,int v){e[++ne][0]=v,e[ne][1]=h[u],h[u]=ne;} void __u(int*t,int p,int k){if(p<1)p=1; for(;p<N;p+=p&-p)t[p]+=k; } int __q(int*t,int p){if(p<1)return 0;int z=0;for(;p;p-=p&-p)z+=t[p];return z;} int __s(int*t,int k){int p=0,v=0,j=1<<20;for(;j>>=1;)if(p+j<N&&v+t[p+j]<k)v+=t[p+=j];return p+1;} void doedge(int v,int k){ __u(ttt,tin[v],k); __u(ttt,tout[v]+1,-k); } void dfs(int u,int p){ tin[u]=timer++; for(int v,j=h[u];j;j=e[j][1])if((v=e[j][0])!=p&&y[j>>1]){ dd[v]=dd[pp[v]=u]+1; ee[v]=j>>1; pp[v]=u; jj[v]=(dd[p]-dd[jj[u]]==dd[jj[u]]-dd[jj[jj[u]]])?jj[jj[u]]:u; dfs(v,u); doedge(v,1); } tout[u]=timer-1; } int qq(int u,int v){ if(dd[u]>dd[v])return qq(v,u); while(dd[v]>dd[u]) if(dd[jj[v]]>=dd[u]) v=jj[v]; else v=pp[v]; while(u-v) if(jj[v]-jj[u])u=jj[u],v=jj[v]; else u=pp[u],v=pp[v]; return u; } int nx(int u,int aa){ int base=__q(ttt,tin[u]); while(dd[u]>dd[aa]&&__q(ttt,tin[pp[u]])==base){ u=(dd[jj[u]]>dd[aa]&&__q(ttt,tin[jj[u]])==base)?jj[u]:pp[u]; } return u; } int need[N],np,ord=1; int c1(int i,int j){return i<j?-1:1;}//i>j?1:0;} int main(){ 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; pp[1]=jj[1]=1;dfs(1,1); for(int j=1;j<=m;++j)if(!w[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),aa[]={u,v}; for(int kk=0;kk<2;++kk){ int ii=nx(aa[kk],lca); while(dd[ii]>dd[lca]) { doedge(ii,-1),need[np++]=ee[ii]; ii=nx(ii,lca); } } compar=c1;sort(need,0,np); for(int i=0;i<np;++i) w[need[i]]=ord++; np=0; w[j]=ord++; }else{ w[j]=ord++; doedge(v,-1); } } for(int j=1;j<=m;++j)printf("%d ",w[j]); }

Compilation message (stderr)

riggedroads.cpp: In function 'int main()':
riggedroads.cpp:58:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   58 |     scanf("%d%d",&n,&m);
      |     ~~~~~^~~~~~~~~~~~~~
riggedroads.cpp:59:35: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |     for(int u,v,i=1;i<=m;++i)scanf("%d%d",&u,&v),_l(u,v),_l(v,u);
      |                              ~~~~~^~~~~~~~~~~~~~
riggedroads.cpp:60:32: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |     for(int j,i=1;i<n;++i)scanf("%d",&j),y[j]=1;
      |                           ~~~~~^~~~~~~~~
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...