You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
93 lines
3.0 KiB
C++
93 lines
3.0 KiB
C++
#define _CRT_SECURE_NO_WARNINGS
|
|
#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
|
|
#include <bits/stdc++.h>
|
|
using namespace std;
|
|
#define CRP(t, x) const t &x
|
|
#define OPX(op, t, x) operator op(CRP(t, x))
|
|
#define OPL(t, x) bool OPX(<, t, x) const
|
|
#define FIL(x, v) memset(x, v, sizeof(x))
|
|
#define CLR(x) FIL(x, 0)
|
|
#define NE1(x) FIL(x, -1)
|
|
#define INF(x) FIL(x, 0x3f)
|
|
#ifndef _DEBUG
|
|
#define _DEBUG 0
|
|
#endif // !_DEBUG
|
|
#define IFD if (_DEBUG)
|
|
typedef int64_t ll, i64;
|
|
typedef uint64_t ull, u64;
|
|
template <typename... Types>
|
|
using comtype = typename common_type<Types...>::type;
|
|
template <typename T>
|
|
using enable_if_arithmetic = typename enable_if<is_arithmetic<T>::value>::type;
|
|
template <typename T>
|
|
using enable_if_integral = typename enable_if<is_integral<T>::value>::type;
|
|
inline char getchar(int)
|
|
{
|
|
static char buf[64 << 20], *S = buf, *T = buf;
|
|
if (S == T) T = fread(S = buf, 1, 64 << 20, stdin) + buf;
|
|
return S == T ? EOF : *S++;
|
|
}
|
|
template <typename T, typename = enable_if_integral<T>>
|
|
inline bool read(T &x)
|
|
{
|
|
int ch = x = 0, f = 1;
|
|
while (!isdigit(ch = getchar()))
|
|
if (ch == EOF)
|
|
return false;
|
|
else if (ch == '-')
|
|
f = 0;
|
|
for (; isdigit(ch); ch = getchar()) x = x * 10 + ch - '0';
|
|
return x = f ? x : -x, true;
|
|
}
|
|
template <typename T, typename... Args, typename = enable_if_integral<T>>
|
|
inline bool read(T &x, Args &... args) { return read(x) && read(args...); }
|
|
template <typename T1, typename T2, typename TResult = comtype<T1, T2>>
|
|
inline TResult mmin(CRP(T1, v1), CRP(T2, v2)) { return min<TResult>(v1, v2); }
|
|
template <typename T, typename... Args, typename TResult = comtype<T, Args...>>
|
|
inline TResult mmin(CRP(T, v), const Args &... args) { return min<TResult>(v, mmin(args...)); }
|
|
template <typename T1, typename T2, typename TResult = comtype<T1, T2>>
|
|
inline TResult mmax(CRP(T1, v1), CRP(T2, v2)) { return max<TResult>(v1, v2); }
|
|
template <typename T, typename... Args, typename TResult = comtype<T, Args...>>
|
|
inline TResult mmax(CRP(T, v), const Args &... args) { return max<TResult>(v, mmax(args...)); }
|
|
inline ll gcd(ll a, ll b)
|
|
{
|
|
for (; b; swap(a, b)) a = a % b;
|
|
return a;
|
|
}
|
|
inline ll fpow(ll a, ll b, ll m)
|
|
{
|
|
ll r = 1;
|
|
for (; b; b >>= 1, a = a * a % m)
|
|
if (b & 1) r = r * a % m;
|
|
return r;
|
|
}
|
|
constexpr double eps = 1e-8;
|
|
inline int sgn(double x) { return x > eps ? 1 : x < -eps ? -1 : 0; }
|
|
const int N = 2e5 + 50;
|
|
struct Edge
|
|
{
|
|
int nxt, to;
|
|
} E[N];
|
|
int adj[N], ecnt, vis[N];
|
|
inline void addEdge(int f, int t)
|
|
{
|
|
E[++ecnt] = {adj[f], t};
|
|
adj[f] = ecnt;
|
|
}
|
|
void dfs(int x)
|
|
{
|
|
vis[x] = true;
|
|
for (int e = adj[x]; e; e = E[e].nxt)
|
|
if (!vis[E[e].to]) dfs(E[e].to);
|
|
}
|
|
int main()
|
|
{
|
|
int n, k;
|
|
read(n, k);
|
|
for (int i = 0, x, y; i < k; i++) read(x, y), addEdge(x, y), addEdge(y, x);
|
|
int cnt = 0;
|
|
for (int i = 1; i <= n; i++)
|
|
if (!vis[i]) cnt++, dfs(i);
|
|
printf("%d", max(0, k - (n - cnt)));
|
|
return 0;
|
|
} |