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Cod sursa(job #304984)
#include<fstream>
#include<iostream>
using namespace std;
char vo[123],p;
int v[123];
int main()
{
ifstream f("ordine.in");
ofstream g("ordine.out");
//char a[100];
int s=0;
char i;
for(i=97;i<=122;i++)
{s++;vo[s]=i;}
//fscanf(f,"%s",&a);
//n=strlen(a);
while(f>>p)
{f>>p;
v[(int)p]++;}
for(i=97;i<=122;i++)
if(v[i]!=0)
g<<vo[i];;
g<<"\n";
f.close();
g.close();
return 0;
}