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Cod sursa(job #124918)
#include<fstream.h>
#include<string.h>
long n,m,i,j,k,r,rez,cate,sir[36002][20];
char a[22];
int main(){
ifstream fin("restante.in");
ofstream fout("restante.out");
fin>>n;
fin.getline(a,20);
for(i=1;i<=n;i++){
fin.getline(a,20);
m=strlen(a);
for(j=0;j<m;j++)
sir[i][j+2]=a[j]-'a'+1;
sir[i][0]=m;
}
for(i=1;i<=n;i++)
if(sir[i][1]!=-1)
for(j=i+1;j<=n;j++){
rez=0;
if(sir[j][1]!=-1)
if(sir[i][0]==sir[j][0])
for(k=2;k<=sir[i][0]+2;k++){
r=0;
r=sir[i][k]^sir[j][k];
rez=rez^r;
}
if(rez==0){
sir[i][1]=-1;
sir[j][1]=-1;
}
}
for(i=1;i<=n;i++)
if(sir[i][1]==0)
cate++;
fout<<cate;
return 0;
}