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Cod sursa(job #551795)
#include<stdio.h>
FILE*f=fopen("dusman.in","r");
FILE*g=fopen("dusman.out","w");
int n,m,k,nr1,nr2,a[1001][1001],ok,lex,s[1001],viz[1001],i;
void back(int nr){
if(ok)
return ;
if(nr>n){
++lex;
if(lex==k){
for( i=1;i<=n;++i)
fprintf(g,"%d ",s[i]);
ok=1;
}
}
for( i=1;i<=n;++i){
if(!viz[i]){
s[nr]=i;
viz[i]=1;
if(a[s[nr]][s[nr-1]]==0)
back(nr+1);
viz[i]=0;
}
}
}
int main() {
fscanf(f,"%d%d%d",&n,&k,&m);
for( i=1;i<=m;++i){
fscanf(f,"%d%d",&nr1,&nr2);
a[nr1][nr2]=1;
a[nr2][nr1]=1;
}
back(1);
fclose(g);
fclose(f);
return 0;
}