P2264 情书 - 洛谷 | 计算机科学教育新生态 https://www.luogu.com.cn/problem/P2264
#include<bits/stdc++.h>
#define Ll long long
using namespace std;
map<string,int>F;
string s,c;
int n,ans;
bool b[105];
string turn(string s){
for(int i=0;i<s.length();i++)
if(isupper(s[i]))s[i]=s[i]+'a'-'A';//s[i]=s[i]+'a'-'A是什么意思呢
return s;
}
int main()
{
ios::sync_with_stdio(0);
cin>>n;
for(int i=1;i<=n;i++)
cin>>s,F[turn(s)]=i;
getline(cin,s);//这句是什么意思呢?
getline(cin,s);
for(int i=0;i<s.length();i++)
if(isalpha(s[i]))c+=s[i];else{
int x=F[turn(c)];
if(x&&!b[x])ans++,b[x]=1;
c="";
if(s[i]=='.')memset(b,0,sizeof b);
}cout<<ans;
}
谢谢大家!