思路：感覺像是一道模擬題，把每行句子記錄，然後把單詞提取出來，存入Set裡面。找的時候只需要找哪一段存在或者不存在這個單詞，然後再逐行進行判斷輸出即可。

AC程式碼：

#include<cstdio>
#include<cstring>
#include<string>
#include<iostream>
#include<cctype>
#include<algorithm>
#include<set>
#include<sstream>
#include<fstream>
using namespace std;

string raw[1510][85];
set<string> word[1510][1000]; //代表每一段每一行單詞的集合 
set<string> words[1510];//每一段單詞的集合 
int n,len[1510]; //len表示每一段的行數 
ofstream SaveFile("output.txt");

void AND(string a,string b)
{
	int i,j,f3 = 0; //f3的作用是控制輸出格式 
	for(i = 0;i < n;i++)
	{
		if(words[i].count(a) && words[i].count(b))
		{
			if(f3 == 1)
			{
				printf("----------\n");
			}
			for(j = 0;j < len[i];j++)
			{
				if(word[i][j].count(a) || word[i][j].count(b))
				{
					cout << raw[i][j] << endl;
					f3 = 1;
				}
			}
		}
	}
	if(f3 == 0)
	{
		printf("Sorry, I found nothing.\n");
	}
	printf("==========\n");
}

void OR(string a,string b)
{
	int i,j,f3 = 0;
	for(i = 0;i < n;i++)
	{
		if(words[i].count(a) || words[i].count(b))
		{
			if(f3 == 1)
			{
				printf("----------\n");
				f3 = 0;
			}
			for(j = 0;j < len[i];j++)
			{
				if(word[i][j].count(a) || word[i][j].count(b))
				{
					cout << raw[i][j] << endl;
					f3 = 1;
				}
			}
		}
	}
	if(f3 == 0)
	{
		printf("Sorry, I found nothing.\n");
	}
	printf("==========\n");
}

void NOT(string a)
{
	int i,j,f3 = 0;
	for(i = 0;i < n;i++)
	{
		if(!words[i].count(a))
		{
			if(f3 == 1)
			{
				printf("----------\n");
			}
			for(j = 0;j < len[i];j++)
			{
				cout << raw[i][j] << endl;
			}
			f3 = 1;
		}
	}
	if(f3 == 0)
	{
		printf("Sorry, I found nothing.\n");
	}
	printf("==========\n");
}

int main()
{
	string s,w;
	int i,j,k,m;	
	scanf("%d",&n);
	getchar();
	memset(len,0,sizeof(len));
	for(i = 0;i < n;i++)
	{
		j = 0;
		while(getline(cin,s) && s[0] != '*')
		{
			raw[i][j] += s;
			for(k = 0;k < s.length();k++)
			{
				if(!isalpha(s[k]))
				{
					s[k] = ' '; //把非字母以外的其他東西都轉換成空格 
				}
			}
			transform(s.begin(),s.end(),s.begin(),::tolower); //全部轉換為小寫 
			stringstream ss(s);
			while(ss >> w)
			{
				word[i][j].insert(w);
				words[i].insert(w);
			}
			j++;
		}
		len[i] = j;
	}
	scanf("%d",&m);
	getchar();
	while(m--)
	{
		string a,b,ww;
		getline(cin,ww);
		for(i = 0;i < ww.length();i++)
		{
			if(ww[i] == 'A')
			{
				AND(ww.substr(0,ww.find_first_of("A")-1),ww.substr(ww.find_first_of("A")+4));
				break;
			}
			else if(ww[i] == 'R')
			{
				OR(ww.substr(0,ww.find_first_of("R")-2),ww.substr(ww.find_first_of("R")+2));
				break;
			}
			else if(ww[i] == 'T')
			{
				NOT(ww.substr(ww.find_first_of("T")+2));
				break;
			}
		}
		if(i == ww.length())
		{
			int f1 = 0;
			for(i = 0;i < n;i++)
			{
				if(words[i].count(ww))
				{
					if(f1 == 1)
					{
						printf("----------\n");
					}
					for(j = 0;j < len[i];j++)
					{
						if(word[i][j].count(ww))
						{
							cout << raw[i][j] << endl;
							f1 = 1;
						}
					}
				}	
			}
			if(f1 == 0)
			{
				printf("Sorry, I found nothing.\n");
			}
			printf("==========\n");
		}	
	}
}