眼红的MedusaWA65

常规
1 
#include <bits/stdc++.h>
using namespace std ;
const int N = 1e5 + 5 ;
int n, m ;
int a[N], b[N] ;
int main () {
	cin >> n >> m ;
	for (int i = 1; i <= n; i ++) {
		cin >> a[i] ;
	}
	for (int i = 1; i <= m; i ++) {
		cin >> b[i] ;
	}	
	sort (b + 1, b + 1 + m) ;
	for (int i = 1; i <= n; i ++) {
		int l = 1, r = m, mid ;
		while (l < r) {
            //cout << "l :" << l << " " << "r :" << r << "\n" ;
			mid = (l + r) >> 1 ;
			if (b[mid] == a[i]) {
				cout << a[i] << " " ;
			}
			if (b[mid] >= a[i]) {
				r = mid ;
			} else {
				l = mid + 1 ;
			}
		}
	}
}
2

加特判

3

?这不对吧