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Futurex firmware software 筛选题求助

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donghaox 发表于 2016-7-4 01:06:57 | 显示全部楼层 |阅读模式

2016(7-9月) 码农类 本科 全职@Futurex - 网上海投 - HR筛选 在线笔试 |Otherfresh grad应届毕业生

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各路大神, 学霸,程序员们好不太确定应该发在求职一栏还是刷题一栏比较好,我最近投futurex 的 entry level firware SW,他们的HR回了我一封面试题,说实话,我对C++还不是太熟,所以也没油什么思路,所以想请地里的人看看~. 1point3acres.com/bbs

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>. Waral 鍗氬鏈夋洿澶氭枃绔,
#include <sys/time.h>. from: 1point3acres.com/bbs

typedef int int32;
typedef unsigned char int8;

static void integrate_arrays(int8  *output, int8  *input_1, const int8  *input_2, int32 length)
{
    int32 i = 0;

    for(i=0; i<length; i++)
    {
        output = (int8)(input_1 ^ input_2);
    }

    return;
}

static void itoa( int32 num, int8  *alpha, int32 radix )
{
    if( radix == 10 ). more info on 1point3acres.com
    {
        sprintf(alpha, "%i", num);
    }
    else if( radix == 16 )
    {
        sprintf(alpha, "%X", num);
    }
}. 鐣欏鐢宠璁哄潧-涓浜╀笁鍒嗗湴

int8 *gen_modified_key(int8 modifier, const int8  *input_1, int32 length)
{
    int8  leading[3];
    int32 i_leading;
    int8 * temp_string = NULL;. 1point 3acres 璁哄潧
    int8 * ret;
    int32 i = 0;.鐣欏璁哄潧-涓浜-涓夊垎鍦

    itoa(modifier/2, leading, 10);
    i_leading = atoi(leading);
    temp_string = (int8 *) malloc(8);
    ret = (int8 *) malloc(length);. 1point 3acres 璁哄潧
    memset(temp_string, 0, 8);
    temp_string[0] = 0;
. visit 1point3acres.com for more.
    if( (modifier+1)%2 == 0 ) {
        temp_string[0] = (int8)((i_leading<<4) + 8);
    }   
    else {
        temp_string[0] = (int8)(i_leading<<4);
    }    鏉ユ簮涓浜.涓夊垎鍦拌鍧.

    for(i=0; i<(length>>3); i++)
    {
        integrate_arrays(ret+i*8, temp_string, input_1+i*8, 8);
    }   
    free(temp_string);
    return ret;
}   

// Do not change anything in main
// main only contains example input
// Change anything else
int main(int argc, char **argv) {

    // Example input data
    int8 data[32] = { 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,16,
                     17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32};
    int8 *resp = gen_modified_key(0x10, data, sizeof(data));. more info on 1point3acres.com
    free(resp);

    return 0;
}. 1point3acres.com/bbs
鏉ユ簮涓浜.涓夊垎鍦拌鍧.
1.  What does the function gen_modified_key do?
2.  What problems or issues, if any, do you see with it?
3.  How could you improve the function, and what benefits would your improvements make?
4.  What other additional improvements could you make to the rest of the code?
. visit 1point3acres.com for more.
In addition to answering the above questions in your response, we would also like you to re-write the code to incorporate your improvements. I would like to point out that the code is intentionally flawed and not indicative of our overall code quality. We would like you to improve it to make the function more efficient while ensuring the input parameters are the same, and the output matches what it would have been before your changes. We are looking for you to only make efficiency improvements, not changes related to security or functionality.

这个挺长的,可能不是太难,大家多多讨论,futurex他们公司在扩招,都是entry level SW 而且都是这道题, 希望地里的人都有希望进去
. more info on 1point3acres.com


 楼主| donghaox 发表于 2016-7-5 05:11:42 | 显示全部楼层
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Warald_一亩三分地
真的没有人看一眼吗。。。。
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Druss 发表于 2016-7-30 02:27:29 | 显示全部楼层
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Warald
我昨天拿到了和你一样的题,请问你解决了么
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 楼主| donghaox 发表于 2016-8-3 02:02:34 | 显示全部楼层
Druss 发表于 2016-7-30 02:27
我昨天拿到了和你一样的题,请问你解决了么

没有呀, 我对C不是很熟, 所有就放弃了,不过这个好心没有时间限制
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