Submission #52551200

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Source Code Expand

#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define pa first
#define pb second
#define endl '\n'
#define vint vector<int>
#define vlong vector<ll>
#define pii pair<int, int>
#define rep(i, a, b) for (int i = int(a); i < int(b); i++)
#define rng(i, a, b) for (int i = int(a); i <= int(b); i++)
#define per(i, a, b) for (int i = int(b - 1); i >= int(a); i--)
#define gnr(i, a, b) for (int i = int(b); i >= int(a); i--)
using namespace std;
#define ATC
#ifdef ATC
#include <atcoder/all>
using namespace atcoder;
#endif

#ifdef MT
void solve()
{
}
#endif
const int N = 1010;
int cnt[N];
int main(void)
{
    std::ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n, q;
    cin >> n >> q;
    rep(i, 0, q)
    {
        int t;
        cin >> t;
        ++cnt[t];
    }
    int ans = 0;
    rng(i, 1, n)
    {
        if (!(cnt[i] & 1)) {
            ++ans;
        }
    }
    cout << ans << endl;

#ifdef MT
    int t;
    cin >> t;
    for (int i = 0; i < t; i++)
        solve();
#endif
}

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