Submission #7708

#TimeUsernameProblemLanguageResultExecution timeMemory
7708baneling100Parachute rings (IOI12_rings)C++98
0 / 100
1999 ms110300 KiB
#include <algorithm> #include <vector> using namespace std; typedef pair <int,int> ppair; vector <int> Ring[1000000]; vector <ppair> Line; int N, Three, Anc[1000000][4], Cycle[4], Deg[1000000][4], Size[1000000][4], MaxDeg[4], CycleSize, Die[4]; void Init(int N_) { int i; N = N_; for(i=0 ; i<N ; i++) { Size[i][0]=Size[i][1]=Size[i][2]=Size[i][3]=1; Anc[i][0]=Anc[i][1]=Anc[i][2]=Anc[i][3]=-1; } } int FindAnc(int X, int Y) { int Father, Temp; Father=X; while(Anc[Father][Y]>=0) { Father=Anc[Father][Y]; } while(Anc[X][Y]>=0) { Temp=Anc[X][Y]; Anc[X][Y]=Father; X=Temp; } return Father; } void DivideThree(int X) { int i, j=Line.size(), k, P, Q; for(i=0 ; i<N ; i++) { Anc[i][0]=Deg[i][0]=-1; Size[i][0]=1; } Cycle[0]=0; Die[0]=X; for(i=0 ; i<j ; i++) if(Line[i].first!=X && Line[i].second!=X) { Deg[Line[i].first][0]++; Deg[Line[i].second][0]++; if(MaxDeg[0]<Deg[Line[i].first][0]) MaxDeg[0]=Deg[Line[i].first][0]; if(MaxDeg[0]<Deg[Line[i].second][0]) MaxDeg[0]=Deg[Line[i].second][0]; P=FindAnc(Line[i].first,0); Q=FindAnc(Line[i].second,0); if(P<Q) { Anc[Q][0]=P; Size[P][0]+=Size[Q][0]; Size[Q][0]=0; } else if(P>Q) { Anc[P][0]=Q; Size[Q][0]+=Size[P][0]; Size[P][0]=0; } else Cycle[0]++; } for(k=0 ; k<3 ; k++) { Die[k+1]=Ring[X][k]; for(i=0 ; i<j ; i++) if(Line[i].first!=Ring[X][k] && Line[i].second!=Ring[X][k]) { Deg[Line[i].first][k+1]++; Deg[Line[i].second][k+1]++; if(MaxDeg[k+1]<Deg[Line[i].first][k+1]) MaxDeg[k+1]=Deg[Line[i].first][k+1]; if(MaxDeg[k+1]<Deg[Line[i].second][k+1]) MaxDeg[k+1]=Deg[Line[i].second][k+1]; P=FindAnc(Line[i].first,k+1); Q=FindAnc(Line[i].second,k+1); if(P<Q) { Anc[Q][k+1]=P; Size[P][k+1]+=Size[Q][k+1]; Size[Q][k+1]=0; } else if(P>Q) { Anc[P][k+1]=Q; Size[Q][k+1]+=Size[P][k+1]; Size[P][k+1]=0; } else Cycle[k+1]++; } } } void Link(int A, int B) { int i, X, Y; Ring[A].push_back(B); Ring[B].push_back(A); Line.push_back(make_pair(A,B)); if(Three) for(i=0 ; i<4 ; i++) { if(A!=Die[i] && B!=Die[i]) { Deg[A][i]++; Deg[B][i]++; if(MaxDeg[i]<Deg[A][i]) MaxDeg[i]=Deg[A][i]; if(MaxDeg[i]<Deg[B][i]) MaxDeg[i]=Deg[B][i]; X=FindAnc(A,i); Y=FindAnc(B,i); if(X<Y) { Anc[Y][i]=X; Size[X][i]+=Size[Y][i]; Size[Y][i]=0; } else if(X>Y) { Anc[X][i]=Y; Size[Y][i]+=Size[X][i]; Size[X][i]=0; } else Cycle[i]++; } } else { Deg[A][0]++; Deg[B][0]++; X=FindAnc(A,0); Y=FindAnc(B,0); if(X<Y) { Anc[Y][0]=X; Size[X][0]+=Size[Y][0]; Size[Y][0]=0; } else if(X>Y) { Anc[X][0]=Y; Size[Y][0]+=Size[X][0]; Size[X][0]=0; } else { Cycle[0]++; CycleSize=Size[X][0]; } if(Deg[A][0]>=3) { DivideThree(A); Three=1; } else if(Deg[B][0]>=3) { DivideThree(B); Three=1; } } } int CountCritical(void) { int i, Cnt=0; if(Three) { for(i=0 ; i<4 ; i++) if(MaxDeg[i]<=2 && !Cycle[i]) Cnt++; return Cnt; } else { if(Cycle[0]==0) return N; else if(Cycle[0]==1) return CycleSize; else return 0; } }
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