Submission #516198

#TimeUsernameProblemLanguageResultExecution timeMemory
516198mosiashvililukaNewspapers (CEOI21_newspapers)C++14
100 / 100
68 ms6848 KiB
#include<bits/stdc++.h> using namespace std; int a,b,c,d,e,i,j,ii,jj,zx,xc,p[5009],pi,kl[1003][1003],DP[1009],l[5009],li,bo[5009],P[5009],PI; int CH[1009][1009]; vector <int> v[1009]; void print(){ pi=PI; for(i=1; i<=PI; i++){ p[i]=P[i]; } cout<<"YES\n"; cout<<pi<<"\n"; for(i=1; i<=pi; i++){ cout<<p[i]<<" "; } /* cout<<"\n"; for(i=1; i<=a; i++) CH[0][i]=1; for(j=1; j<=pi; j++){ for(i=1; i<=a; i++){ CH[j][i]=0; for(vector <int>::iterator it=v[i].begin(); it!=v[i].end(); it++){ if(p[j]!=(*it)&&CH[j-1][(*it)]==1){ CH[j][i]=1;break; } } } } e=0; for(i=1; i<=a; i++){ if(CH[pi][i]==1) e++; } cout<<"WRONG: "<<e; */ exit(0); } void dfs(int q, int w, int rr){ e=max(e,rr); for(vector <int>::iterator it=v[q].begin(); it!=v[q].end(); it++){ if((*it)==w) continue; dfs((*it),q,rr+1); } } void dfs2(int q, int w){ int I=i; li++;l[li]=q;bo[q]=1; if(DP[q]-kl[q][w]==0){ pi=0; for(j=1; j<=li; j++){ pi++;p[pi]=l[j]; for(vector <int>::iterator it=v[l[j]].begin(); it!=v[l[j]].end(); it++){ if(bo[(*it)]==1) continue; if(v[(*it)].size()!=1){ pi++;p[pi]=(*it); pi++;p[pi]=l[j]; } } } for(i=pi; i>=1; i--){ pi++;p[pi]=p[i]; } if(PI>pi){ PI=pi; for(i=1; i<=pi; i++) P[i]=p[i]; } i=I; //print(); } for(vector <int>::iterator it=v[q].begin(); it!=v[q].end(); it++){ if((*it)==w) continue; if(DP[q]-kl[q][w]-kl[q][(*it)]>0) continue; dfs2((*it),q); } li--;bo[q]=0; } int main(){ ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0); cin>>a>>b;PI=10*a+10; for(i=1; i<=b; i++){ cin>>c>>d; v[c].push_back(d); v[d].push_back(c); } if(a==1){ PI=1;P[1]=1; print(); } if(a==2){ PI=2;P[1]=1;P[2]=1; print(); } if(b!=a-1){ cout<<"NO"; return 0; } for(i=1; i<=a; i++){ for(vector <int>::iterator it=v[i].begin(); it!=v[i].end(); it++){ e=0; dfs((*it),i,1); if(e>2){ kl[i][(*it)]=1;DP[i]++; } } } for(i=1; i<=a; i++){ dfs2(i,0); } if(PI!=10*a+10){ print(); } cout<<"NO"; return 0; }
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