Rezumat problemă

EscapeLight

#4806

Andrei se află într-un labirint format dintr-o matrice de camere, fiecare având unul dintre următoarele tipuri: 0: cameră cu bec stins, 1: cameră cu bec aprins, 2: cameră fără bec (inaccesibilă), 3: cameră cu întrerupător.

Camerele de tip 3 pot aprinde/stinge becurile altor camere. Andrei poate alege să apese sau nu întrerupătoarele întâlnite. El pornește dintr-o cameră dată și trebuie să ajungă într-o cameră destinație, deplasându-se doar prin camere aprinse.

Se cere determinarea distanței minime pentru a ajunge la destinație.

Concursul Național de Matematică și Informatică Grigore Moisil

Fișiere Moca Andrei (TREYWAY) Moca Andrei, Lorintz Alexandru, Maierean Mircea concurs

Clasa 11 Teoria Grafurilor Parcurgerea grafurilor neorientate măști de biți

Rezolvă

Detalii

Problema	EscapeLight	Operații I/O	escapelight.in/escapelight.out
Limita timp	0.7 secunde	Limita memorie	Total: 64 MB / Stivă 8 MB
Id soluție	#63615773	Utilizator	Aaaa Bbbb (mariodario890)
Fișier	escapelight.c	Dimensiune	2.29 KB
Data încărcării	11 Martie 2026, 13:18	Scor/rezultat	70 puncte

Evaluare

Mesaj compilare

escapelight.c: In function 'main':
escapelight.c:9:1196: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result]
 typedef unsigned short us;static int n,m,g[C],a[C],sid[C],ip[C],pos[U],si[U],vis[C],q[C],ds[C],d[S][U][U],dist[S][U],hn,hv[H],hp[H],dx[4]={-1,1,0,0},dy[4]={0,0,-1,1},p,uc,st,go,tim;static void up(int v,int c){int i=++hn,j;for(hv[i]=v,hp[i]=c;i>1&&hp[j=i>>1]>c;i=j)hv[i]=hv[j],hp[i]=hp[j];hv[i]=v;hp[i]=c;}static int pop(int*c){int r=hv[1],v=hv[hn],x=hp[hn--],i=1,j;*c=hp[1];while((j=i<<1)<=hn){if(j<hn&&hp[j+1]<hp[j])j++;if(hp[j]>=x)break;hv[i]=hv[j];hp[i]=hp[j];i=j;}hv[i]=v;hp[i]=x;return r;}static int ok(int x,int mk){return g[x]==2?0:g[x]==3?1:(g[x]^__builtin_parity((unsigned)(mk&a[x])));}static void bfs(int mk,int s){int i,j,l=0,r=0,u=pos[s],need=uc,x,y,nx,ny,v;for(i=0;i<uc;i++)d[mk][s][i]=INF;if(!ok(u,mk))return;vis[u]=++tim;ds[u]=0;q[r++]=u;d[mk][s][s]=0;need--;while(l<r&&need){x=q[l++];y=x%m;for(i=0;i<4;i++){nx=x/m+dx[i];ny=y+dy[i];if(nx<0||nx>=n||ny<0||ny>=m)continue;v=nx*m+ny;if(vis[v]==tim||!ok(v,mk))continue;vis[v]=tim;ds[v]=ds[x]+1;q[r++]=v;if((j=ip[v])!=-1&&d[mk][s][j]==INF)d[mk][s][j]=ds[v],need--;}}}int main(void){FILE*in=fopen("escapelight.in","r"),*out=fopen("escapelight.out","w");int i,j,k,pp,xs,ys,xf,yf,ms,mk,cur,cst,cm,ci,sw,nm,ni,v;if(!in||!out)return 0;fscanf(in,"%d%d",&n,&m);ms=n*m;for(i=0;i<ms;i++)sid[i]=ip[i]=-1;for(i=0;i<n;i++)for(j=0;j<m;j++){fscanf(in,"%d",&g[i*m+j]);if(g[i*m+j]==3)sid[i*m+j]=p++;}fscanf(in,"%d%d%d%d",&xs,&ys,&xf,&yf);st=(xs-1)*m+ys-1;go=(xf-1)*m+yf-1;fscanf(in,"%d%d",&k,&pp);for(i=0;i<k;i++){int xsw,ysw,xl,yl,s,l;fscanf(in,"%d%d%d%d",&xsw,&ysw,&xl,&yl);s=(xsw-1)*m+ysw-1;l=(xl-1)*m+yl-1;a[l]|=1<<sid[s];}for(i=0;i<ms;i++)if(sid[i]!=-1)ip[i]=uc,pos[uc]=i,si[uc]=sid[i],uc++;if(ip[st]==-1)ip[st]=uc,pos[uc]=st,si[uc++]=-1;if(ip[go]==-1)ip[go]=uc,pos[uc]=go,si[uc++]=-1;for(mk=0;mk<(1<<p);mk++)for(i=0;i<uc;i++)bfs(mk,i);for(mk=0;mk<(1<<p);mk++)for(i=0;i<uc;i++)dist[mk][i]=1e9;hn=0;dist[0][ip[st]]=0;up(ip[st],0);while(hn){cur=pop(&cst);cm=cur/uc;ci=cur%uc;if(cst!=dist[cm][ci])continue;if(ci==ip[go]){fprintf(out,"%d\n",cst+1);return 0;}if((sw=si[ci])!=-1&&(cst<dist[nm=cm^(1<<sw)][ci]))dist[nm][ci]=cst,up(nm*uc+ci,cst);for(i=0;i<uc;i++)if(i!=ci&&(v=d[cm][ci][i])<INF&&(ni=cst+v)<dist[cm][i])dist[cm][i]=ni,up(cm*uc+i,ni);}return 0;}
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            ^
escapelight.c:9:1293: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result]
 typedef unsigned short us;static int n,m,g[C],a[C],sid[C],ip[C],pos[U],si[U],vis[C],q[C],ds[C],d[S][U][U],dist[S][U],hn,hv[H],hp[H],dx[4]={-1,1,0,0},dy[4]={0,0,-1,1},p,uc,st,go,tim;static void up(int v,int c){int i=++hn,j;for(hv[i]=v,hp[i]=c;i>1&&hp[j=i>>1]>c;i=j)hv[i]=hv[j],hp[i]=hp[j];hv[i]=v;hp[i]=c;}static int pop(int*c){int r=hv[1],v=hv[hn],x=hp[hn--],i=1,j;*c=hp[1];while((j=i<<1)<=hn){if(j<hn&&hp[j+1]<hp[j])j++;if(hp[j]>=x)break;hv[i]=hv[j];hp[i]=hp[j];i=j;}hv[i]=v;hp[i]=x;return r;}static int ok(int x,int mk){return g[x]==2?0:g[x]==3?1:(g[x]^__builtin_parity((unsigned)(mk&a[x])));}static void bfs(int mk,int s){int i,j,l=0,r=0,u=pos[s],need=uc,x,y,nx,ny,v;for(i=0;i<uc;i++)d[mk][s][i]=INF;if(!ok(u,mk))return;vis[u]=++tim;ds[u]=0;q[r++]=u;d[mk][s][s]=0;need--;while(l<r&&need){x=q[l++];y=x%m;for(i=0;i<4;i++){nx=x/m+dx[i];ny=y+dy[i];if(nx<0||nx>=n||ny<0||ny>=m)continue;v=nx*m+ny;if(vis[v]==tim||!ok(v,mk))continue;vis[v]=tim;ds[v]=ds[x]+1;q[r++]=v;if((j=ip[v])!=-1&&d[mk][s][j]==INF)d[mk][s][j]=ds[v],need--;}}}int main(void){FILE*in=fopen("escapelight.in","r"),*out=fopen("escapelight.out","w");int i,j,k,pp,xs,ys,xf,yf,ms,mk,cur,cst,cm,ci,sw,nm,ni,v;if(!in||!out)return 0;fscanf(in,"%d%d",&n,&m);ms=n*m;for(i=0;i<ms;i++)sid[i]=ip[i]=-1;for(i=0;i<n;i++)for(j=0;j<m;j++){fscanf(in,"%d",&g[i*m+j]);if(g[i*m+j]==3)sid[i*m+j]=p++;}fscanf(in,"%d%d%d%d",&xs,&ys,&xf,&yf);st=(xs-1)*m+ys-1;go=(xf-1)*m+yf-1;fscanf(in,"%d%d",&k,&pp);for(i=0;i<k;i++){int xsw,ysw,xl,yl,s,l;fscanf(in,"%d%d%d%d",&xsw,&ysw,&xl,&yl);s=(xsw-1)*m+ysw-1;l=(xl-1)*m+yl-1;a[l]|=1<<sid[s];}for(i=0;i<ms;i++)if(sid[i]!=-1)ip[i]=uc,pos[uc]=i,si[uc]=sid[i],uc++;if(ip[st]==-1)ip[st]=uc,pos[uc]=st,si[uc++]=-1;if(ip[go]==-1)ip[go]=uc,pos[uc]=go,si[uc++]=-1;for(mk=0;mk<(1<<p);mk++)for(i=0;i<uc;i++)bfs(mk,i);for(mk=0;mk<(1<<p);mk++)for(i=0;i<uc;i++)dist[mk][i]=1e9;hn=0;dist[0][ip[st]]=0;up(ip[st],0);while(hn){cur=pop(&cst);cm=cur/uc;ci=cur%uc;if(cst!=dist[cm][ci])continue;if(ci==ip[go]){fprintf(out,"%d\n",cst+1);return 0;}if((sw=si[ci])!=-1&&(cst<dist[nm=cm^(1<<sw)][ci]))dist[nm][ci]=cst,up(nm*uc+ci,cst);for(i=0;i<uc;i++)if(i!=ci&&(v=d[cm][ci][i])<INF&&(ni=cst+v)<dist[cm][i])dist[cm][i]=ni,up(cm*uc+i,ni);}return 0;}
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             ^
escapelight.c:9:1350: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result]
 typedef unsigned short us;static int n,m,g[C],a[C],sid[C],ip[C],pos[U],si[U],vis[C],q[C],ds[C],d[S][U][U],dist[S][U],hn,hv[H],hp[H],dx[4]={-1,1,0,0},dy[4]={0,0,-1,1},p,uc,st,go,tim;static void up(int v,int c){int i=++hn,j;for(hv[i]=v,hp[i]=c;i>1&&hp[j=i>>1]>c;i=j)hv[i]=hv[j],hp[i]=hp[j];hv[i]=v;hp[i]=c;}static int pop(int*c){int r=hv[1],v=hv[hn],x=hp[hn--],i=1,j;*c=hp[1];while((j=i<<1)<=hn){if(j<hn&&hp[j+1]<hp[j])j++;if(hp[j]>=x)break;hv[i]=hv[j];hp[i]=hp[j];i=j;}hv[i]=v;hp[i]=x;return r;}static int ok(int x,int mk){return g[x]==2?0:g[x]==3?1:(g[x]^__builtin_parity((unsigned)(mk&a[x])));}static void bfs(int mk,int s){int i,j,l=0,r=0,u=pos[s],need=uc,x,y,nx,ny,v;for(i=0;i<uc;i++)d[mk][s][i]=INF;if(!ok(u,mk))return;vis[u]=++tim;ds[u]=0;q[r++]=u;d[mk][s][s]=0;need--;while(l<r&&need){x=q[l++];y=x%m;for(i=0;i<4;i++){nx=x/m+dx[i];ny=y+dy[i];if(nx<0||nx>=n||ny<0||ny>=m)continue;v=nx*m+ny;if(vis[v]==tim||!ok(v,mk))continue;vis[v]=tim;ds[v]=ds[x]+1;q[r++]=v;if((j=ip[v])!=-1&&d[mk][s][j]==INF)d[mk][s][j]=ds[v],need--;}}}int main(void){FILE*in=fopen("escapelight.in","r"),*out=fopen("escapelight.out","w");int i,j,k,pp,xs,ys,xf,yf,ms,mk,cur,cst,cm,ci,sw,nm,ni,v;if(!in||!out)return 0;fscanf(in,"%d%d",&n,&m);ms=n*m;for(i=0;i<ms;i++)sid[i]=ip[i]=-1;for(i=0;i<n;i++)for(j=0;j<m;j++){fscanf(in,"%d",&g[i*m+j]);if(g[i*m+j]==3)sid[i*m+j]=p++;}fscanf(in,"%d%d%d%d",&xs,&ys,&xf,&yf);st=(xs-1)*m+ys-1;go=(xf-1)*m+yf-1;fscanf(in,"%d%d",&k,&pp);for(i=0;i<k;i++){int xsw,ysw,xl,yl,s,l;fscanf(in,"%d%d%d%d",&xsw,&ysw,&xl,&yl);s=(xsw-1)*m+ysw-1;l=(xl-1)*m+yl-1;a[l]|=1<<sid[s];}for(i=0;i<ms;i++)if(sid[i]!=-1)ip[i]=uc,pos[uc]=i,si[uc]=sid[i],uc++;if(ip[st]==-1)ip[st]=uc,pos[uc]=st,si[uc++]=-1;if(ip[go]==-1)ip[go]=uc,pos[uc]=go,si[uc++]=-1;for(mk=0;mk<(1<<p);mk++)for(i=0;i<uc;i++)bfs(mk,i);for(mk=0;mk<(1<<p);mk++)for(i=0;i<uc;i++)dist[mk][i]=1e9;hn=0;dist[0][ip[st]]=0;up(ip[st],0);while(hn){cur=pop(&cst);cm=cur/uc;ci=cur%uc;if(cst!=dist[cm][ci])continue;if(ci==ip[go]){fprintf(out,"%d\n",cst+1);return 0;}if((sw=si[ci])!=-1&&(cst<dist[nm=cm^(1<<sw)][ci]))dist[nm][ci]=cst,up(nm*uc+ci,cst);for(i=0;i<uc;i++)if(i!=ci&&(v=d[cm][ci][i])<INF&&(ni=cst+v)<dist[cm][i])dist[cm][i]=ni,up(cm*uc+i,ni);}return 0;}
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      ^
escapelight.c:9:1422: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result]
 typedef unsigned short us;static int n,m,g[C],a[C],sid[C],ip[C],pos[U],si[U],vis[C],q[C],ds[C],d[S][U][U],dist[S][U],hn,hv[H],hp[H],dx[4]={-1,1,0,0},dy[4]={0,0,-1,1},p,uc,st,go,tim;static void up(int v,int c){int i=++hn,j;for(hv[i]=v,hp[i]=c;i>1&&hp[j=i>>1]>c;i=j)hv[i]=hv[j],hp[i]=hp[j];hv[i]=v;hp[i]=c;}static int pop(int*c){int r=hv[1],v=hv[hn],x=hp[hn--],i=1,j;*c=hp[1];while((j=i<<1)<=hn){if(j<hn&&hp[j+1]<hp[j])j++;if(hp[j]>=x)break;hv[i]=hv[j];hp[i]=hp[j];i=j;}hv[i]=v;hp[i]=x;return r;}static int ok(int x,int mk){return g[x]==2?0:g[x]==3?1:(g[x]^__builtin_parity((unsigned)(mk&a[x])));}static void bfs(int mk,int s){int i,j,l=0,r=0,u=pos[s],need=uc,x,y,nx,ny,v;for(i=0;i<uc;i++)d[mk][s][i]=INF;if(!ok(u,mk))return;vis[u]=++tim;ds[u]=0;q[r++]=u;d[mk][s][s]=0;need--;while(l<r&&need){x=q[l++];y=x%m;for(i=0;i<4;i++){nx=x/m+dx[i];ny=y+dy[i];if(nx<0||nx>=n||ny<0||ny>=m)continue;v=nx*m+ny;if(vis[v]==tim||!ok(v,mk))continue;vis[v]=tim;ds[v]=ds[x]+1;q[r++]=v;if((j=ip[v])!=-1&&d[mk][s][j]==INF)d[mk][s][j]=ds[v],need--;}}}int main(void){FILE*in=fopen("escapelight.in","r"),*out=fopen("escapelight.out","w");int i,j,k,pp,xs,ys,xf,yf,ms,mk,cur,cst,cm,ci,sw,nm,ni,v;if(!in||!out)return 0;fscanf(in,"%d%d",&n,&m);ms=n*m;for(i=0;i<ms;i++)sid[i]=ip[i]=-1;for(i=0;i<n;i++)for(j=0;j<m;j++){fscanf(in,"%d",&g[i*m+j]);if(g[i*m+j]==3)sid[i*m+j]=p++;}fscanf(in,"%d%d%d%d",&xs,&ys,&xf,&yf);st=(xs-1)*m+ys-1;go=(xf-1)*m+yf-1;fscanf(in,"%d%d",&k,&pp);for(i=0;i<k;i++){int xsw,ysw,xl,yl,s,l;fscanf(in,"%d%d%d%d",&xsw,&ysw,&xl,&yl);s=(xsw-1)*m+ysw-1;l=(xl-1)*m+yl-1;a[l]|=1<<sid[s];}for(i=0;i<ms;i++)if(sid[i]!=-1)ip[i]=uc,pos[uc]=i,si[uc]=sid[i],uc++;if(ip[st]==-1)ip[st]=uc,pos[uc]=st,si[uc++]=-1;if(ip[go]==-1)ip[go]=uc,pos[uc]=go,si[uc++]=-1;for(mk=0;mk<(1<<p);mk++)for(i=0;i<uc;i++)bfs(mk,i);for(mk=0;mk<(1<<p);mk++)for(i=0;i<uc;i++)dist[mk][i]=1e9;hn=0;dist[0][ip[st]]=0;up(ip[st],0);while(hn){cur=pop(&cst);cm=cur/uc;ci=cur%uc;if(cst!=dist[cm][ci])continue;if(ci==ip[go]){fprintf(out,"%d\n",cst+1);return 0;}if((sw=si[ci])!=-1&&(cst<dist[nm=cm^(1<<sw)][ci]))dist[nm][ci]=cst,up(nm*uc+ci,cst);for(i=0;i<uc;i++)if(i!=ci&&(v=d[cm][ci][i])<INF&&(ni=cst+v)<dist[cm][i])dist[cm][i]=ni,up(cm*uc+i,ni);}return 0;}
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              ^
escapelight.c:9:1486: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result]
 typedef unsigned short us;static int n,m,g[C],a[C],sid[C],ip[C],pos[U],si[U],vis[C],q[C],ds[C],d[S][U][U],dist[S][U],hn,hv[H],hp[H],dx[4]={-1,1,0,0},dy[4]={0,0,-1,1},p,uc,st,go,tim;static void up(int v,int c){int i=++hn,j;for(hv[i]=v,hp[i]=c;i>1&&hp[j=i>>1]>c;i=j)hv[i]=hv[j],hp[i]=hp[j];hv[i]=v;hp[i]=c;}static int pop(int*c){int r=hv[1],v=hv[hn],x=hp[hn--],i=1,j;*c=hp[1];while((j=i<<1)<=hn){if(j<hn&&hp[j+1]<hp[j])j++;if(hp[j]>=x)break;hv[i]=hv[j];hp[i]=hp[j];i=j;}hv[i]=v;hp[i]=x;return r;}static int ok(int x,int mk){return g[x]==2?0:g[x]==3?1:(g[x]^__builtin_parity((unsigned)(mk&a[x])));}static void bfs(int mk,int s){int i,j,l=0,r=0,u=pos[s],need=uc,x,y,nx,ny,v;for(i=0;i<uc;i++)d[mk][s][i]=INF;if(!ok(u,mk))return;vis[u]=++tim;ds[u]=0;q[r++]=u;d[mk][s][s]=0;need--;while(l<r&&need){x=q[l++];y=x%m;for(i=0;i<4;i++){nx=x/m+dx[i];ny=y+dy[i];if(nx<0||nx>=n||ny<0||ny>=m)continue;v=nx*m+ny;if(vis[v]==tim||!ok(v,mk))continue;vis[v]=tim;ds[v]=ds[x]+1;q[r++]=v;if((j=ip[v])!=-1&&d[mk][s][j]==INF)d[mk][s][j]=ds[v],need--;}}}int main(void){FILE*in=fopen("escapelight.in","r"),*out=fopen("escapelight.out","w");int i,j,k,pp,xs,ys,xf,yf,ms,mk,cur,cst,cm,ci,sw,nm,ni,v;if(!in||!out)return 0;fscanf(in,"%d%d",&n,&m);ms=n*m;for(i=0;i<ms;i++)sid[i]=ip[i]=-1;for(i=0;i<n;i++)for(j=0;j<m;j++){fscanf(in,"%d",&g[i*m+j]);if(g[i*m+j]==3)sid[i*m+j]=p++;}fscanf(in,"%d%d%d%d",&xs,&ys,&xf,&yf);st=(xs-1)*m+ys-1;go=(xf-1)*m+yf-1;fscanf(in,"%d%d",&k,&pp);for(i=0;i<k;i++){int xsw,ysw,xl,yl,s,l;fscanf(in,"%d%d%d%d",&xsw,&ysw,&xl,&yl);s=(xsw-1)*m+ysw-1;l=(xl-1)*m+yl-1;a[l]|=1<<sid[s];}for(i=0;i<ms;i++)if(sid[i]!=-1)ip[i]=uc,pos[uc]=i,si[uc]=sid[i],uc++;if(ip[st]==-1)ip[st]=uc,pos[uc]=st,si[uc++]=-1;if(ip[go]==-1)ip[go]=uc,pos[uc]=go,si[uc++]=-1;for(mk=0;mk<(1<<p);mk++)for(i=0;i<uc;i++)bfs(mk,i);for(mk=0;mk<(1<<p);mk++)for(i=0;i<uc;i++)dist[mk][i]=1e9;hn=0;dist[0][ip[st]]=0;up(ip[st],0);while(hn){cur=pop(&cst);cm=cur/uc;ci=cur%uc;if(cst!=dist[cm][ci])continue;if(ci==ip[go]){fprintf(out,"%d\n",cst+1);return 0;}if((sw=si[ci])!=-1&&(cst<dist[nm=cm^(1<<sw)][ci]))dist[nm][ci]=cst,up(nm*uc+ci,cst);for(i=0;i<uc;i++)if(i!=ci&&(v=d[cm][ci][i])<INF&&(ni=cst+v)<dist[cm][i])dist[cm][i]=ni,up(cm*uc+i,ni);}return 0;}
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              ^

Rezultat evaluare

Cum funcționează evaluarea?