結果

問題 No.1565 Union
ユーザー satashun
提出日時 2023-08-10 22:04:41
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 102 ms / 2,000 ms
コード長 10,680 bytes
コンパイル時間 2,181 ms
コンパイル使用メモリ 209,476 KB
最終ジャッジ日時 2025-02-16 00:37:44
ジャッジサーバーID
(参考情報)
judge5 / judge4
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 27
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ソースコード

diff #
プレゼンテーションモードにする

#pragma region satashun
// #pragma GCC optimize("Ofast")
// #pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
using namespace std;
using uint = unsigned int;
using ll = long long;
using ull = unsigned long long;
using pii = pair<int, int>;
template <class T>
using V = vector<T>;
template <class T>
using VV = V<V<T>>;
template <class T>
V<T> make_vec(size_t a) {
return V<T>(a);
}
template <class T, class... Ts>
auto make_vec(size_t a, Ts... ts) {
return V<decltype(make_vec<T>(ts...))>(a, make_vec<T>(ts...));
}
template <typename T, typename V>
void fill_vec(T& v, const V& val) {
v = val;
}
template <typename T, typename V>
void fill_vec(vector<T>& vec, const V& val) {
for (auto& v : vec) fill_vec(v, val);
}
#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fi first
#define se second
#define rep(i, n) rep2(i, 0, n)
#define rep2(i, m, n) for (int i = m; i < (n); i++)
#define per(i, b) per2(i, 0, b)
#define per2(i, a, b) for (int i = int(b) - 1; i >= int(a); i--)
#define ALL(c) (c).begin(), (c).end()
#define SZ(x) ((int)(x).size())
constexpr ll TEN(int n) { return (n == 0) ? 1 : 10 * TEN(n - 1); }
template <class T, class U>
void chmin(T& t, const U& u) {
if (t > u) t = u;
}
template <class T, class U>
void chmax(T& t, const U& u) {
if (t < u) t = u;
}
template <typename T>
int arglb(const V<T>& v, const T& x) {
return distance(v.begin(), lower_bound(ALL(v), x));
}
template <typename T>
int argub(const V<T>& v, const T& x) {
return distance(v.begin(), upper_bound(ALL(v), x));
}
template <class T>
void mkuni(vector<T>& v) {
sort(ALL(v));
v.erase(unique(ALL(v)), end(v));
}
template <class T>
vector<int> sort_by(const vector<T>& v, bool increasing = true) {
vector<int> res(v.size());
iota(res.begin(), res.end(), 0);
if (increasing) {
stable_sort(res.begin(), res.end(),
[&](int i, int j) { return v[i] < v[j]; });
} else {
stable_sort(res.begin(), res.end(),
[&](int i, int j) { return v[i] > v[j]; });
}
return res;
}
// prototype
template <class T, class U>
ostream& operator<<(ostream& os, const pair<T, U>& p);
template <class T>
ostream& operator<<(ostream& os, const vector<T>& v);
template <class T>
istream& operator>>(istream& is, vector<T>& v);
template <class T, size_t sz>
ostream& operator<<(ostream& os, const array<T, sz>& arr);
template <class T>
ostream& operator<<(ostream& os, const set<T>& ST);
template <class T>
ostream& operator<<(ostream& os, const multiset<T>& ST);
template <class T, class U>
ostream& operator<<(ostream& os, const map<T, U>& MP);
ostream& operator<<(ostream& o, __int128_t x);
// io functions
template <class T, class U>
istream& operator>>(istream& is, pair<T, U>& p) {
is >> p.first >> p.second;
return is;
}
template <class T, class U>
ostream& operator<<(ostream& os, const pair<T, U>& p) {
os << "(" << p.first << "," << p.second << ")";
return os;
}
template <class T>
istream& operator>>(istream& is, vector<T>& v) {
for (auto& x : v) {
is >> x;
}
return is;
}
template <class T>
ostream& operator<<(ostream& os, const vector<T>& v) {
os << "{";
rep(i, v.size()) {
if (i) os << ",";
os << v[i];
}
os << "}";
return os;
}
template <class T, size_t sz>
ostream& operator<<(ostream& os, const array<T, sz>& arr) {
os << '[';
for (auto v : arr) os << v << ',';
os << ']';
return os;
}
template <class T>
ostream& operator<<(ostream& os, const set<T>& ST) {
os << "{";
for (auto it = ST.begin(); it != ST.end(); ++it) {
if (it != ST.begin()) os << ",";
os << *it;
}
os << "}";
return os;
}
template <class T>
ostream& operator<<(ostream& os, const multiset<T>& ST) {
os << "{";
for (auto it = ST.begin(); it != ST.end(); ++it) {
if (it != ST.begin()) os << ",";
os << *it;
}
os << "}";
return os;
}
template <class T, class U>
ostream& operator<<(ostream& os, const map<T, U>& MP) {
for (auto it = MP.begin(); it != MP.end(); ++it) {
os << "(" << it->first << ": " << it->second << ")";
}
return os;
}
string to_string(__int128_t x) {
if (x == 0) return "0";
string result;
if (x < 0) {
result += "-";
x *= -1;
}
string t;
while (x) {
t.push_back('0' + x % 10);
x /= 10;
}
reverse(t.begin(), t.end());
return result + t;
}
ostream& operator<<(ostream& o, __int128_t x) { return o << to_string(x); }
#ifdef LOCAL
void debug_out() { cerr << endl; }
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
cerr << " " << H;
debug_out(T...);
}
#define debug(...) \
cerr << __LINE__ << " [" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#define dump(x) cerr << __LINE__ << " " << #x << " = " << (x) << endl
#else
#define debug(...) (void(0))
#define dump(x) (void(0))
#endif
template <class T>
V<T>& operator+=(V<T>& vec, const T& v) {
for (auto& x : vec) x += v;
return vec;
}
template <class T>
V<T>& operator-=(V<T>& vec, const T& v) {
for (auto& x : vec) x -= v;
return vec;
}
// suc : 1 = newline, 2 = space
template <class T>
void print(T x, int suc = 1) {
cout << x;
if (suc == 1)
cout << "\n";
else if (suc == 2)
cout << " ";
}
template <class T>
void print(const vector<T>& v, int suc = 1) {
for (int i = 0; i < v.size(); ++i)
print(v[i], i == int(v.size()) - 1 ? suc : 2);
}
template <class T>
void show(T x) {
print(x, 1);
}
template <typename Head, typename... Tail>
void show(Head H, Tail... T) {
print(H, 2);
show(T...);
}
int topbit(int t) { return t == 0 ? -1 : 31 - __builtin_clz(t); }
int topbit(ll t) { return t == 0 ? -1 : 63 - __builtin_clzll(t); }
int botbit(int a) { return a == 0 ? 32 : __builtin_ctz(a); }
int botbit(ll a) { return a == 0 ? 64 : __builtin_ctzll(a); }
int popcount(int t) { return __builtin_popcount(t); }
int popcount(ll t) { return __builtin_popcountll(t); }
int bit_parity(int t) { return __builtin_parity(t); }
int bit_parity(ll t) { return __builtin_parityll(t); }
struct prepare_io {
prepare_io() {
cin.tie(nullptr);
ios::sync_with_stdio(false);
cout << fixed << setprecision(10);
}
} prep_io;
#pragma endregion satashun
template <class T>
class Edge {
public:
int from, to, idx;
T cost;
Edge() = default;
Edge(int from, int to, T cost = T(1), int idx = -1)
: from(from), to(to), cost(cost), idx(idx) {}
operator int() const { return to; }
bool operator<(const Edge& e) const { return cost < e.cost; }
};
template <class T>
class Graph {
public:
using E = Edge<T>;
vector<vector<E>> g;
vector<E> edges;
int es;
Graph() {}
Graph(int n) : g(n), edges(0), es(0){};
int size() const { return g.size(); }
virtual void add_directed_edge(int from, int to, T cost = 1) {
g[from].emplace_back(from, to, cost, es++);
}
virtual void add_edge(int from, int to, T cost = 1) {
g[from].emplace_back(from, to, cost, es);
g[to].emplace_back(to, from, cost, es++);
}
inline vector<E>& operator[](const int& k) { return g[k]; }
inline const vector<E>& operator[](const int& k) const { return g[k]; }
void read(int M, int offset = -1, bool directed = false,
bool weighted = false) {
for (int i = 0; i < M; i++) {
int a, b;
cin >> a >> b;
a += offset;
b += offset;
T c = T(1);
if (weighted) cin >> c;
edges.emplace_back(a, b, c, i);
if (directed)
add_directed_edge(a, b, c);
else
add_edge(a, b, c);
}
}
};
// ABC264G
template <class T>
V<T> bellman_ford(const Graph<T>& g, int s = 0) {
const auto INF = numeric_limits<T>::max();
int n = g.size();
V<T> ds(n, INF);
ds[s] = 0;
rep(i, n) {
rep(v, n) {
for (auto& e : g[v]) {
if (ds[e.from] == INF) continue;
chmin(ds[e.to], ds[e.from] + e.cost);
}
}
}
rep(v, n) {
for (auto& e : g[v]) {
if (ds[e.from] == INF) continue;
if (ds[e.from] + e.cost < ds[e.to]) return V<T>();
}
}
return ds;
}
// cost = 1 or tree
template <class T>
V<T> bfs(const Graph<T>& g, int s = 0) {
const T inf = numeric_limits<T>::max() / 2;
int n = g.size();
V<T> ds(n, inf);
queue<int> que;
que.push(s);
ds[s] = 0;
while (!que.empty()) {
auto v = que.front();
que.pop();
for (auto e : g[v]) {
T nx = ds[v] + e.cost;
if (ds[e.to] > nx) {
ds[e.to] = nx;
que.push(e.to);
}
}
}
for (auto& x : ds)
if (x == inf) x = -1;
return ds;
}
// must be optimized
template <class T>
V<T> bfs01(const Graph<T>& g, int s = 0) {
const T inf = numeric_limits<T>::max() / 2;
int n = g.size();
V<T> ds(n, inf);
using P = pair<T, int>;
deque<int> que;
que.push_back(s);
ds[s] = 0;
while (!que.empty()) {
auto v = que.front();
que.pop_front();
for (auto e : g[v]) {
T nx = ds[v] + e.cost;
if (ds[e.to] > nx) {
ds[e.to] = nx;
if (e.cost == 0) {
que.push_front(e.to);
} else {
que.push_back(e.to);
}
}
}
}
for (auto& x : ds)
if (x == inf) x = -1;
return ds;
}
template <class T>
V<T> dijkstra(const Graph<T>& g, int s = 0) {
const T inf = numeric_limits<T>::max() / 2;
int n = g.size();
V<T> ds(n, inf);
using P = pair<T, int>;
priority_queue<P, V<P>, greater<P>> que;
que.emplace(0, s);
ds[s] = 0;
while (!que.empty()) {
auto p = que.top();
que.pop();
int v = p.se;
if (ds[v] < p.fi) continue;
for (auto e : g[v]) {
T nx = ds[v] + e.cost;
if (ds[e.to] > nx) {
ds[e.to] = nx;
que.emplace(nx, e.to);
}
}
}
for (auto& x : ds)
if (x == inf) x = -1;
return ds;
}
void slv() {
// input
int N, M;
cin >> N >> M;
Graph<int> g(N);
g.read(M);
// solve
auto ds = bfs(g, 0);
show(ds[N - 1]);
}
int main() {
int cases = 1;
// cin >> cases;
rep(i, cases) slv();
return 0;
}
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