下厨房
简洁版
集合的插入和个数统计

#include<cstdio>
#include<iostream>
#include<string>
#include<set>
using namespace std;

int main(){
	string s;
	set<string> bag;
	while(cin>>s){
		bag.insert(s);
	}
	cout<<bag.size()<<endl;
	return 0;
}

快速版
字符数组的读入和比较

#include<cstdio>
#include<cstring>

int main(){
	char s[55][55];
	int i =0,cnt = 0;
	bool tag;
	while(scanf("%s",s[i])!=EOF){
		tag = true;
		for(int j=0;j<i;j++){
			if(strcmp(s[j],s[i])==0){
				tag = false;
				break;
			}	
		}
		if(tag==true){
				i++;
				cnt++;
			}
	}
	printf("%d",cnt);
	return 0;
}