求大佬，为何只有50？

#include <bits/stdc++.h>
using namespace std;

int n, m;
map<int, bool> c;
int a[100000];
int b[100000];

int main() {
	cin >> n >> m;
	for (int i = 0; i < n; i++) {
		cin >> a[i];
	}
	for (int i = 0; i < m; i++) {
		cin >> b[i];
	}
	for (int i = 0; i < m; i++) {
		c[b[i]] = 1;
	}
	for (int i = 1; i <= n; i++) {
		if (c[a[i]] == 1) {
			cout << a[i] << " ";
		}
	}

	return 0;
}