How to generate 10 times random numbers without being repeated, with loop?

Question

#include<stdio.h>
#include<stdlib.h> 
#include<locale.h>
#include<conio.h>
#include<time.h>
#include<windows.h> 

int main(){

    int nSorteado[6];
    int i, j, n1, n2, op, seq[6];
    int Ncorretos=0, pontos=0, seg;
    
    srand(time(NULL));
    
    setlocale(LC_ALL, "Portuguese");
    system("color F4");
    
    for(i=0; i < 10; i++)
    {
        printf("############### JOGO DA MEMÓRIA #################");
        printf("\n*\n* Escolha um intervalo de números: ");
        scanf("%d %d", &n1, &n2);   
        printf("*\n");
        printf("* Embaralhando os números de %d a %d...\n*", n1, n2);
        
            for(i=0; i < 6; i++)
            {
                nSorteado[i] = n1 + rand() % (n2-n1+1);
            }
        
            printf("\n* Voce tem 5 segundos para decorar os 6 números.\n\n");
            for(i=0; i < 6; i++)
            {
                printf("%d ", nSorteado[i]);
            }
            seg=5;
            do
            {
                printf("\n\n%ds",seg);
                
                if(seg==20)
                {
                    seg=0;
                }
                Sleep(1000);
                seg--;         
            }while(seg>0);
            
            system("cls");
            
            printf("\nQual foi a sequencia dos 5 números sorteados?\n");
            printf("\n*Obs:. Digite os números com espaço entre eles. Ex: 1 2 3 4 5 6.\n\n");
            
            for(i=0; i < 6; i++)
            {
                scanf("%d", &seq[i]);
                if(seq[i] == nSorteado[i])
                {
                    Ncorretos++;
                }
            }
            
            if(Ncorretos == 6)
            {
                printf("Parabéns!! Você acertou!");
            }
            else
            {
                printf("Errado! Tente novamente...");
            }
            Sleep(1000);
            system("cls");
        }   
    return 0;
}

Note: Every time the code is executed, it generates 6 random numbers. The first time the code is executed and the user enters the correct sequence of the numbers, he receives a message of "Congratulations", but the other times that the user type the correct sequence, he receives an error message. I have tried several ways to tidy up but it did not work out the game work normally. If anyone can help me I really appreciate.

Answer 1

You can try to store the numbers in an array and whenever you generate, use one to check if the random number has already been drawn.