P3879 [TJOI2010]阅读理解-白红宇

P3879 [TJOI2010]阅读理解

阅读量：337 次

发布时间：2019-03-04

本文共 529 字，大约阅读时间需要 1 分钟。

题目

思路

这道题要求我们制作一个数据结构，支持静态询问字符串x出现在哪些短文中并去重。

首先，我们先要判断每一个字符串x是否出现过，显然可以使用

m a p

进行映射，接下来我们要输出x出现在哪些短文中，所以我们可以用vector来存储，但是，set自带的去重功能更加吸引我们，所以我们使用map套set完成。

code:

#include
   
    #include
    
     #include
     
      #include
      #include
       
        using namespace std;map
        
         
           > a;int n,m;string x;int main(){ cin>>n; for (int i=0;i
          
           >m; for (int j=0;j
           
            >x; a[x].insert(i+1); } } cin>>n; for (int i=0;i
            
             >x; if (a.find(x)!=a.end()) { for (set
             
              ::iterator it=a[x].begin();it!=a[x].end();it++) cout<<*it<<' '; } cout<

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