题解 | #配置文件恢复#

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

char command[6][50]={"reset","reset board","board add","board delete","reboot backplane","backplane abort"},
    execution[7][50]={"reset what","board fault","where to add","no board at all","impossible","install first","unknown command"};
int spacecount[6]={0,1,1,1,1,1};    //空格數，即關鍵詞數

int main() {
    char order[21];
    while (scanf("%[^\n]", order)!=EOF) {
        getchar();  //因為上面讀取到回車符就停止了，所以這裡要讀取掉上面剩下的回車符
        char (*pCol)[50]=command;
        int i, j, j0, possible_index[6], possible_cnt=0, len=strlen(order), leni, spaceflag=0;
        for (i=0; i<6; i++) {
            spaceflag=0;
            leni=strlen((char*)(pCol+i)); 
            // printf("leni=%d\n", leni);
            for (j=0,j0=0; j<=len&&j0<=leni; j++,j0++) {
                // printf("j=%d j0=%d order:%c;comm:%c\n", j,j0,order[j],*(*(pCol+i)+j0));
                if (order[j]==' ' && j!=0) {
                    spaceflag++;    //記錄輸入指令的空格數
                    while (*(*(pCol+i)+j0)!=' ' && *(*(pCol+i)+j0)!='\0') {
                        j0++;   //command跳轉到下一個關鍵詞首字母
                    }
                }
                else if (order[j]=='\0') {
                    if (spaceflag!=spacecount[i]) break;    //若關鍵詞個數匹配不上則循環中斷
                    possible_index[possible_cnt]=i; //記錄疑似指令字典
                    possible_cnt++; //疑似指令字典數+1
                    break;
                }
                else if (order[j]==*(*(pCol+i)+j0)) {
                    continue;
                }
                else if (order[j]!=*(*(pCol+i)+j0) || *(*(pCol+i)+j0)=='\0') {
                    break;  //若對不上則循環中斷
                }
            }
        }
        if (possible_cnt!=1) {
            printf("%s\n", execution[6]);   //若無匹配則打印未知指令
        } else {
            printf("%s\n", execution[possible_index[0]]);   //打印對應指令
        }
    }
    return 0;
}