Submission #2861046

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
#define FOR(i,r,n) for(ll i = (ll)(r); i < (ll)(n); i++)
#define RFOR(i,r,n) for(ll i=(ll)(n-1);i>=r;i--)
#define REP(i,n) FOR(i,0,n)
#define RREP(i,n) RFOR(i,0,n)
#define ALL(x) x.begin(),x.end()
#define RALL(x) x.rbegin(),x.rend()
typedef long long int ll;
typedef vector<ll> vi;
typedef vector<pair<ll, ll> > vp;
typedef vector<string> vs;
typedef vector<char> vc;
typedef list<ll> lst;
typedef pair<ll, ll> P;
const long long INF = numeric_limits<ll>::max();
const long long MOD = 1000000007;
const long double PI = 3.1415926;
template <class T> T &chmin(T &a, const T &b) { return a = min(a, b); }
template <class T> T &chmax(T &a, const T &b) { return a = max(a, b); }
 
ll n, m, k, ans = 0, sum = 0, cnt = 0;
string s;
//char c;
 
#define Endl endl
 
/*--------------------template--------------------*/

int main() {
    ll N, M;
    cin>>N>>M;
    if(N==M){
        cout<<0<<endl;
        return 0;
    }
    set<ll> v1,v2;
    REP(i,M){
        ll va,vb;
        cin>>va>>vb;
        v1.insert(va);
        v2.insert(vb);
    }
    cout<<M-(M-v1.size())-(M-v2.size())<<endl;
    return 0;
}

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