piesa perdida, C (gcc)

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#include <stdio.h>

void poblarVector(unsigned long * , unsigned long);
void mostrarVector(unsigned long * , unsigned long);
void ordenarVector(unsigned long * , unsigned long);
unsigned long calcularPiezaPerdida(unsigned long * , unsigned long);
unsigned long sumaPiezasVectorRec(unsigned long * , unsigned long);

int main()
{
    unsigned long totalPiezas;
    do
    {
        scanf("%lu", &totalPiezas);
        if (totalPiezas == 0) 
        {
            printf("---ADIOS ANDRES---");
            return 0;
        }
        unsigned long puzzle[totalPiezas-1];
        poblarVector(puzzle,totalPiezas-1);
        ordenarVector(puzzle,totalPiezas-1);
        mostrarVector(puzzle,totalPiezas-1);
        unsigned long piezaPerdida = calcularPiezaPerdida(puzzle,totalPiezas-1);
        printf("Falta la Pieza No. %lu\n",piezaPerdida);
    } while (1);
    return 0;
}

void poblarVector(unsigned long *A, unsigned long n)
{
    unsigned long i;
    for (i = 0 ; i < n ; i++)
        scanf("%lu", &A[i]);
}

void mostrarVector(unsigned long *A, unsigned long n)
{
    unsigned long i;
    printf("Piezas Encontradas = ");
    for (i = 0 ; i < n ; i++)
    {
        if (i == 0)
            printf("%lu",A[i]);
        else
            printf(" , %lu",A[i]);
    }
    printf("\n");
}

void ordenarVector(unsigned long *A, unsigned long n)
{
    unsigned long temp;
    unsigned long i;
    unsigned long k;
    for ( i = 0 ; i < n - 1 ; i++)
        for (k = i + 1 ; k < n ; k++)
            if( A[i] > A[k] )
            {
                temp = A[i];
                A[i] = A[k];
                A[k] = temp;
            }
}

unsigned long calcularPiezaPerdida(unsigned long *A, unsigned long n)
{
    unsigned m = n + 1;
    unsigned long sumaTodasLasPiezas = (m * (m+1)) / 2;
    unsigned long suma = sumaPiezasVectorRec(A,n-1);
    return sumaTodasLasPiezas - suma;
}

unsigned long sumaPiezasVectorRec(unsigned long *A , unsigned long ultPos)
{
    if (ultPos == 0) return A[0];
    return A[ultPos] + sumaPiezasVectorRec(A,ultPos-1);
    
}

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Compilation time: 0.12 sec, absolute running time: 0.16 sec, cpu time: 0.01 sec, memory peak: 6 Mb, absolute service time: 0,43 sec