acepta el reto 146 , C (gcc)

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//gcc 5.4.0
// CRISTIAN IGNACIO TAPIA SALAS
#include <stdio.h>
#include <stdlib.h>
#define MAX 100000
typedef struct posibleafortunado{
    int n;
    char num[MAX];
}posibleafortunado;
int main(void)
{
    int i,j,cont1,cont2,cont3,flag;
    posibleafortunado a;
    do{
        scanf("%d",&a.n);
        if(a.n==0)break;
        for(j=0;j<a.n;j++){
            a.num[j]='0';
        }
        cont1=2;
        cont2=a.n;
        while(cont1<=cont2){
            flag=0;
            for(i=0;i<a.n && flag==0;i++){
                if(a.num[i]=='0'){
                    j=i;
                    flag=1;
                    a.num[j]='1';
                    cont2--;
                }
            }
            cont3=0;
            while(j<a.n){
                if(a.num[j]=='0'){
                    cont3++;
                }
                if(cont3==cont1){
                    a.num[j]='1';
                    cont3=0;
                    cont2--;
                }
                j++;
            }
            cont1++;
        }
        printf("%d:",a.n);
        for(j=a.n-1;j>=0;j--){
            if(a.num[j]=='0'){
                    printf(" %d",j+1);
            }
        }
        printf("\n");
    }while(a.n!=0);
    return 0;
}

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Compilation time: 0.13 sec, absolute running time: 0.08 sec, cpu time: 0.02 sec, memory peak: 3 Mb, absolute service time: 0,3 sec