C 解法, 执行用时: 1ms, 内存消耗: 344KB, 提交时间: 2021-03-27

#include <stdio.h>
#include <string.h>

char exe[7][50] = {"reset what", "board fault", "where to add", "no board at all", 
                   "impossible", "install first", "unknown command"};


int GetInput(char **str)
{
    int i = 0, ret = -1, pos = 0;
    char cRawStr[100] = {0};
    if (fgets(cRawStr, 99, stdin) != NULL) {
        ret = sscanf(cRawStr, "%s %s", str[0], str[1]);
    }
//     printf("%s: %s %s %s %d\n", __FUNCTION__, cRawStr, *str, *(str + 1), ret);
    return ret;
}

int ParseCmd(char **str, int i)
{
//     printf("%s: %s %s %d\n", __FUNCTION__, str[0], str[1], i);
    int index = -1;
    if (i == 0) {
        index = 6;
    }
    else if (1 == i) {
        if (strncmp(str[0], "reset", strlen(str[0])) == 0) {
            index = 0;
        }
    }
    else {
        if (strncmp(str[0], "reset", strlen(str[0])) == 0) {
            if (strncmp(str[1], "board", strlen(str[1])) == 0) {
                if (-1 != index) {
                    index = 6;
                }
                else {
                    index = 1;
                }
            }
        }
        
        if (strncmp(str[0], "board ", strlen(str[0])) == 0) {
            if (strncmp(str[1], "add", strlen(str[1])) == 0) {
                if (-1 != index) {
                    index = 6;
                }
                else {
                    index = 2;
                }
            }
            else if (strncmp(str[1], "delete", strlen(str[1])) == 0) {
                if (-1 != index) {
                    index = 6;
                }
                else {
                    index = 3;
                }
            }
        }
        
        if (strncmp(str[0], "reboot ", strlen(str[0])) == 0) {
            if (strncmp(str[1], "backplane", strlen(str[1])) == 0) {
                if (-1 != index) {
                    index = 6;
                }
                else {
                    index = 4;
                }
            }
        }
        
        if (strncmp(str[0], "backplane ", strlen(str[0])) == 0) {
            if (strncmp(str[1], "abort", strlen(str[1])) == 0) {
                if (-1 != index) {
                    index = 6;
                }
                else {
                    index = 5;
                }
            }
        }
    }
    if (-1 == index) {
        index = 6;
    }
    return index;
}

int main(void)
{
    int i = 0, index = -1;
    char *str[2] = {NULL ,NULL};
    str[0] = (char *)calloc(20, sizeof(char));
    str[1] = (char *)calloc(20, sizeof(char));
    while ((i = GetInput(str)) && i > 0) {
        index = ParseCmd(str, i);
        printf("%s\n", exe[index]);
    }
    return 0;
}

C 解法, 执行用时: 1ms, 内存消耗: 344KB, 提交时间: 2020-12-20

#include<stdio.h>
#include<string.h>
#include<ctype.h>

char *cmdh[5]={"reset","board","board","reboot","backplane"};
char *cmdl[5]={"board","add","delete","backplane","abort"};
char *cmdout[5]={"board fault",
               "where to add",
               "no board at all",
               "impossible",
               "install first" };
int main()
{
    char cmdin[100];
  
    while(gets(cmdin))
    {
        int n,len_1,len= strlen(cmdin);;
        int flag=0,pos=0,cnt=0;
        int index_o = 0;

        for(int n=0;n<len;n++)
        {
            if(cmdin[n]==' ')
            {
                flag=1;
                pos=n;
                break;
            }

        }
        if(flag == 1)
        {
            for(int n=0;n<5;n++)
            {
                if(strncmp(cmdh[n],cmdin,pos)==0 && strncmp(cmdl[n],cmdin+pos+1,len-pos-1)==0)
                {
                    cnt++;
                    index_o = n;

                }
            }
            if(cnt == 1) printf("%s\n",cmdout[index_o]);
            else printf("unknown command\n");
        }
        else{
            if(strncmp("reset",cmdin,len)==0)
            {
                printf("reset what\n");
            }
            else{
                printf("unknown command\n");
            }

        }
    }
    return 0;
}