[ECP1026] In Lab 2, Question 4

//https://www.facebook.com/AminproPastebin
// Credits to Wei Wen through Joshua Soo for solving the distinct check using bitmap.
#include <stdio.h>
#define LIMIT 10

typedef unsigned int set;

int main(){

        set master;
        set guess;
        int a, b, c, d;
        master = (1<<1)|(1<<0)|(1<<2)|(1<<6); //

        while(1){
                int i;
                int hits =0;
                int flag = 0;

                guess = (0<<0)|(0<<1)|(0<<2)|(0<<3)|(0<<4)|(0<<5)|(0<<6)|(0<<7)|(0<<8)|(0<<9);

                printf("Guess: ");
                scanf("%d%d%d%d", &a, &b, &c, &d );
                guess = (1<<a)|(1<<b)|(1<<c)|(1<<d);

                for(i=0;i<LIMIT;i++){
                if((1<<i)&guess){
            flag++;
            }
        }

                if(flag >= 4){
                        for(i=0; i<LIMIT; i++){
                                if ((1<<i) &guess &master){

                                hits++;
                        }
                }
                printf("%d hit(s)\n", hits);
                }
                else
                        printf("Your guess must contain 4 distinct numbers\n");
        }
        return 0;
}