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Cod sursa(job #419318)
#include<stdio.h>
FILE*f=fopen("permutari.in","r");
FILE*g=fopen("permutari.out","w");
int ok,x[9],n,u;
char viz[9];
void perm(int k){
int i;
if(k==n+1){
ok=0;
for(i=1;i<=n;i++)
fprintf(g,"%d ",x[i]),ok=1;
if(ok==1)
fprintf(g,"\n");
return;
}
for(i=1;i<=n;i++){
if (viz[i]==0) {
x[k]=i;
viz[i] = 1;
perm(k+1);
viz[i] = 0;
}
}
}
int main () {
fscanf(f,"%d",&n);
perm(1);
fclose(f);
fclose(g);
return 0;
}