题解 | #配置文件恢复#

let line;
while (line = readline()) {
    let strs = line.split(' ');
    let result;
    
    if (strs.length === 1) {
        if('reset'.indexOf(strs[0]) > -1) {
            print('reset what');
        } else {
            print('unknown command');
        }
    }
    
    if (strs.length === 2) {
        let cmd1 = ['reset', 'board','board','reboot','backplane'];
        let cmd2 = ['board', 'add', 'delete', 'backplane', 'abort'];
        let results = ['board fault', 'where to add', 'no board at all', 'impossible', 'install first']
        let matched = [];
        
        for(let i = 0; i < cmd1.length; i++) {
            if(cmd1[i].indexOf(strs[0]) > -1) {
                matched.push(i);
            }
        }
        if (matched.length === 0) {
            result = 'unknown command';
        } else if (matched.length > 0) {
            let count = 0;
            for(let num of matched) {
                if(cmd2[num].indexOf(strs[1]) >-1) {
                    result = results[num];
                    count++;
                }
            }
            if (count !== 1) {
                result = 'unknown command';
            }
        }
        print(result);
    }
    
}