import java.io.*; import java.util.*;public class Main {public static void main(String[] args) throws IOException {//輸入BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));int n = Integer.parseInt(bf.readLine());String[][] str = new String[n][2];for (int i = 0; i < n; i++) {str[i] = bf.readLine().split(" ");}int num = Integer.parseInt(bf.readLine());String[] buf = bf.readLine().split(" ");//Set<String> set = new TreeSet<>();StringBuffer sb=new StringBuffer("");for (int i = 0; i < num; i++) {set.add(buf[i]);}for (int j=0;j<n;j++){if(set.contains(str[j][0])&&set.contains(str[j][1])){num-=2;set.remove(str[j][0]);set.remove(str[j][1]);}else {continue;}}System.out.println(num);boolean isFirst = true;for (String id : set) {if (!isFirst) {System.out.print(" ");}System.out.print(id);isFirst = false;}out.flush();} } [柳](https://www.liuchuo.net/archives/2740) #include <iostream> #include <vector> #include <set> using namespace std; int main() {int n, a, b, m;scanf("%d", &n);vector<int> couple(100000, -1);for (int i = 0; i < n; i++) {scanf("%d%d", &a, &b);couple[a] = b;couple[b] = a;}scanf("%d", &m);vector<int> guest(m), isExist(100000);for (int i = 0; i < m; i++) {scanf("%d", &guest[i]);if (couple[guest[i]] != -1)isExist[couple[guest[i]]] = 1;}set<int> s;for (int i = 0; i < m; i++) {if (!isExist[guest[i]])s.insert(guest[i]);}printf("%d\n", s.size());for (auto it = s.begin(); it != s.end(); it++) {if (it != s.begin()) printf(" ");printf("%05d", *it);}return 0; }

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