結果

問題 No.2072 Anatomy
ユーザー dyktr_06
提出日時 2022-09-16 23:25:51
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 52 ms / 2,000 ms
コード長 2,967 bytes
コンパイル時間 2,005 ms
コンパイル使用メモリ 176,680 KB
実行使用メモリ 11,008 KB
最終ジャッジ日時 2024-12-21 23:02:26
合計ジャッジ時間 3,765 ms
ジャッジサーバーID
(参考情報)
judge5 / judge3
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 2
other AC * 27
権限があれば一括ダウンロードができます
コンパイルメッセージ
main.cpp: In function 'void in(T& ...)':
main.cpp:28:55: warning: fold-expressions only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
   28 | template<class... T> void in(T&... a){ (cin >> ... >> a); }
      |                                                       ^
main.cpp: In function 'void out(const T&, const Ts& ...)':
main.cpp:30:112: warning: fold-expressions only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
   30 | template<class T, class... Ts> void out(const T& a, const Ts&... b){ cout << a; (cout << ... << (cout << ' ', b)); cout << '\n'; }
      |                                                                                                                ^

ソースコード

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (int)(n); ++i)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; --i)
#define ALL(a) a.begin(), a.end()
#define Sort(a) sort(a.begin(), a.end())
#define RSort(a) sort(a.rbegin(), a.rend())
typedef long long int ll;
typedef long double ld;
typedef vector<int> vi;
typedef vector<long long> vll;
typedef vector<char> vc;
typedef vector<string> vst;
typedef vector<double> vd;
typedef pair<long long, long long> P;
const long long INF = 0x1fffffffffffffff;
const long long MOD = 1000000007;
const long double PI = acos(-1);
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
template<class T, class U> inline T vin(T& vec, U n) { vec.resize(n); for(int i = 0; i < (int) n; ++i) cin >> vec[i]; return vec; }
template<class T> inline void vout(T vec, string s = "\n"){ for(auto x : vec) cout << x << s; }
template<class... T> void in(T&... a){ (cin >> ... >> a); }
void out(){ cout << '\n'; }
template<class T, class... Ts> void out(const T& a, const Ts&... b){ cout << a; (cout << ... << (cout << ' ', b)); cout << '\n'; }
template<class T, class U> void inGraph(vector<vector<T>>& G, U n, U m, bool directed = false){ G.resize(n); for(int i = 0; i < m; i++){ int a, b;
    cin >> a >> b; a--, b--; G[a].push_back(b); if(!directed) G[b].push_back(a); } }
struct UnionFind {
vector<int> par;
vector<int> siz;
vector<int> edg;
UnionFind(int N) : par(N), siz(N), edg(N) {
for(int i = 0; i < N; i++){
par[i] = i;
siz[i] = 1;
edg[i] = 0;
}
}
int root(int x) {
if (par[x] == x) return x;
return par[x] = root(par[x]);
}
void unite(int x, int y) {
int rx = root(x);
int ry = root(y);
if (rx == ry){
edg[rx]++;
return;
}
par[rx] = ry;
siz[ry] += siz[rx];
edg[ry] += edg[rx] + 1;
}
bool same(int x, int y){
int rx = root(x);
int ry = root(y);
return rx == ry;
}
long long size(int x){
return siz[root(x)];
}
long long edge(int x){
return edg[root(x)];
}
};
ll n, m;
void input(){
in(n, m);
}
void solve(){
ll ans = 0;
vll cnt(n);
UnionFind tree(n);
vector<P> e(m);
rep(i, m){
ll a, b; in(a, b); a--; b--;
e[i] = {a, b};
}
reverse(ALL(e));
rep(i, m){
ll a = e[i].first, b = e[i].second;
if(!tree.same(a, b)){
cnt[tree.root(b)] = max(cnt[tree.root(a)], cnt[tree.root(b)]) + 1;
tree.unite(a, b);
}else{
cnt[tree.root(a)]++;
}
}
rep(i, n) chmax(ans, cnt[i]);
out(ans);
}
int main(){
ios::sync_with_stdio(false);
cin.tie(nullptr);
input();
solve();
}
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