PATA1121_map

注意是从0开始的，用map的时候要注意；

#include<bits/stdc++.h>
using namespace std;
unordered_map<int, int> mp;
map<int, int> mpcnt;
vector<int> v, ans;
int main() {
    int n, m, a, b;
    scanf ("%d", &n);
    for (int i = 0; i < n; i++) {
        scanf ("%d %d", &a, &b);
        mp[a + 1] = b + 1;
        mp[b + 1] = a + 1;
    }
    scanf ("%d", &m);
    for (int i = 0; i < m; i++) {
        scanf ("%d", &a);
        v.push_back(a);
        mpcnt[a]++;
        if (mp[a + 1] != 0) mpcnt[mp[a + 1] - 1]++;
    }
    for (auto it : v) {
        if (mpcnt[it] != 2) ans.push_back(it);
    }
    sort(ans.begin(), ans.end());
    cout << ans.size() << endl;
    for (int i = 0; i < ans.size(); i++) {
        if (i != 0) printf (" ");
        printf ("%05d", ans[i]);
    }
}