50096. Hamming Distance

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

typedef union{
    uint64_t code;
    uint8_t c[8];
} helper;

int n, m, p;
helper valid_code[4];
uint8_t text[256];
uint8_t* code_arr;

static inline void print_bin(uint8_t n){
    for(int i = 7; i >= 0; i--){
        printf("%d", (n >> i) & 1);
    }
}

static inline void get_valid_code(){
    for(int i = 0; i < m; i++){
        uint64_t t;
        scanf("%llu", &(valid_code[i].code));

        for(int j = 0; j < 4; j++){
            uint8_t temp = valid_code[i].c[j];
            valid_code[i].c[j] = valid_code[i].c[7 - j];
            valid_code[i].c[7 - j] = temp;
        }
    }
    code_arr = valid_code[0].c;
}

static inline int check_exact(uint8_t message){
    for(int i = 0; i < n; i++){
        if(message == code_arr[i]) return 1;
    }
    return 0;
}

static inline void solve(uint8_t message){
    if(check_exact(message)){
        printf("%hhu\n", message);
        return;
    }

    for(int i = 7; i >= 0; i--){
        int now_message = message ^ (1 << i);
        if(check_exact(now_message)){
            printf("%hhu\n", now_message);
            return;
        }
    }

}

int main(){
    scanf("%d %d %d", &n, &m, &p);
    get_valid_code();

    for(int i = 0; i < p; i++){
        uint8_t message;
        scanf("%hhu", &message);
        solve(message);
    }
}