学步园

http://218.5.5.242:9018/JudgeOnline/problem.php?id=1316

#include<cstdio> 
#include<cstring> 
#include<iostream> 
#include<string> 
using namespace std; 
int a,b,c; 
string sa[1005],sb[1005],sc[1005]; 
bool checka(int x){ 
    for(int i=0;i<a;i++) 
        if(sa[i]==sb[x])return 1; 
    return 0; 
} 
bool checkc(int x){ 
    for(int i=0;i<c;i++) 
        if(sc[i]==sb[x])return 1; 
    return 0; 
} 
int main(){ 
    while(scanf("%d%d%d",&a,&b,&c)!=EOF){ 
        bool first=1; 
        for(int i=0;i<a;i++)cin>>sa[i]; 
        for(int i=0;i<b;i++)cin>>sb[i]; 
        for(int i=0;i<c;i++)cin>>sc[i]; 
        for (int i = 0; i < b; i++){  
            if(checka(i) && !checkc(i)){  
                if (!first)cout << ' ';  
                    else first = 0;  
            cout << sb[i];  
        }  
    }  
    if (!first)cout << endl;  
        else cout << "No enemy spy" << endl;  
    } 
    return 0; 
} 
/************************************************************** 
    Problem: 1316 
    User: ndsf 
    Language: C++ 
    Result: 正确 
    Time:0 ms 
    Memory:1496 kb 
****************************************************************/