屡次贩糖&不会python

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

const int N = 1e5 + 10;

int n, m, a[N];
map<int, bool> ex;

int main() {
    cin >> n;
    for(int i = 1; i <= n; ++ i) cin >> a[i];
    cin >> m;

    sort(a + 1, a + 1 + n);
    for(int i = 1; i <= n; ++ i) ex[a[i]] = 1;
    for(int i = 1; i <= n; ++ i) {
        if(ex[m - a[i]]) {
            cout << a[i] << ' ' << m - a[i] << endl;
            return 0;
        }
    }
    puts("No");

    return 0;
}

n = int(input())
a = list(map(int, input().split()))
m = int(input())

flg = 0;
a.sort()
ex = []
for i in a:
    ex.append(i)
for i in a:
    if m - i in ex: #不会优化TAT
        print(i, m - i, sep = ' ')
        flg = 1
        break
if not flg:
    print("No")