Something

 /*Inga Tamasauskaite
Informatika, 9gr
programa: ivedamas N skaiciu masyvas, kuriame skaitmenys nuo O..N. Vienas is skaitmenu pakartojamas.kuris?*/

#include <stdio.h>
#include <stdlib.h>
#define q 10

char in[255];
int b[q];
int main()
{
char cc, k;
int n,sk,rep,i,j,found,w, l,d;
int *p;
d=12;
   if (NULL == (p = (int*) malloc (  sizeof (int) * d)))
   { printf("Neuztenka atminties:\n");exit(0);}
printf("Iveskite kiek skaiciu ivedinesite <11:\n");
scanf("%s", &in);
 if (atoi(in)==0) {
 printf ("neteisingai ivedete\n");
 system("pause");
 exit(0);
 } else w=atoi(in);


printf("Iveskite skaicius, is kuriu vienas kartosis 2 kartus:\n");

for (n=0; n<w; n++)
{
scanf("%s", &in);
 if (atoi(in)==0) {
 printf ("neteisingai ivedete\n");
 system("pause");
 exit(0);
 } else sk=atoi(in);
   if (sk>=q)
{
    printf("per didelis skaicius, pasirinkite iki %d, pasirinktas skaicius taps 0\n", q);
    printf("iveskite kitus skaicius\n");
}
else
   b[n]=sk;
}
for(n=0; n<w; n++)
printf("%d", b[n]);
for (i = 1; i <w ; i++)
   for (j = 0; j<i;j++)
   {
      if (b[i] == b[j]) found = i;   /*paima i reiksme ir j reiksme nuo 0 iki i ir lygina tuos masyvo elementus*/
   }
    printf("\n\n\npasikartojantis elementas yra %d\n", b[found]);
    free(p);
    system("pause");
      return 0;
}