結果
| 問題 |
No.168 ものさし
|
| コンテスト | |
| ユーザー |
kei
|
| 提出日時 | 2018-09-07 01:40:59 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 812 ms / 2,000 ms |
| コード長 | 3,941 bytes |
| コンパイル時間 | 2,213 ms |
| コンパイル使用メモリ | 184,864 KB |
| 実行使用メモリ | 20,112 KB |
| 最終ジャッジ日時 | 2024-11-24 14:59:33 |
| 合計ジャッジ時間 | 6,516 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge3 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 19 |
ソースコード
#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const int INF = 1e9;
const ll LINF = 1e18;
template<class S,class T> ostream& operator << (ostream& out,const pair<S,T>& o){ out << "(" << o.first << "," << o.second << ")"; return out; }
template<class T> ostream& operator << (ostream& out,const vector<T> V){ for(int i = 0; i < V.size(); i++){ out << V[i]; if(i!=V.size()-1) out << " ";} return out; }
template<class T> ostream& operator << (ostream& out,const vector<vector<T> > Mat){ for(int i = 0; i < Mat.size(); i++) { if(i != 0) out << endl; out << Mat[i];} return out; }
template<class S,class T> ostream& operator << (ostream& out,const map<S,T> mp){ out << "{ "; for(auto it = mp.begin(); it != mp.end(); it++){ out << it->first << ":" << it->second; if(mp.size()-1 != distance(mp.begin(),it)) out << ", "; } out << " }"; return out; }
/*
<url:https://yukicoder.me/problems/no/168>
問題文============================================================
=================================================================
解説=============================================================
================================================================
*/
struct UnionFind{
vector<int> parent, rank;
UnionFind(int n) : parent(n, -1), rank(n, 0) { }
int find(int x){
if(parent[x] == -1) return x;
else return (parent[x] = find(parent[x]));
}
bool unite(int x, int y){
x = find(x);
y = find(y);
if(x == y) return false;
if(rank[x] < rank[y])
parent[x] = y;
else
parent[y] = x;
if(rank[x] == rank[y]) rank[x]++;
return true;
}
bool same(int x, int y){
return find(x) == find(y);
}
};
typedef long double ld;
typedef complex<ld> Point;
const ld eps = 1e-9, pi = acos(-1.0);
namespace std {
bool operator<(const Point &lhs, const Point &rhs) {
if (lhs.real() < rhs.real() - eps) return true;
if (lhs.real() > rhs.real() + eps) return false;
return lhs.imag() < rhs.imag();
}
}
Point input_point() {ld x, y; cin >> x >> y; return Point(x, y);} // 点の入力
bool eq(ld a, ld b) {return (abs(a - b) < eps);} // 誤差つき等号判定
ld dot(Point a, Point b) {return real(conj(a) * b);} // 内積
ld cross(Point a, Point b) {return imag(conj(a) * b);} // 外積
struct edge{
int u,v;
ld cost;
edge(int u,int v,ld c):u(u),v(v),cost(c){}
bool operator < (const edge& o) const{
return cost < o.cost;
}
bool operator > (const edge& o) const{
return cost > o.cost;
}
};
ll solve(){
ll res = 0;
int N; cin >> N;
vector<Point> ps(N);
for(int i = 0; i < N;i++) ps[i] = input_point();
priority_queue<edge,vector<edge>,greater<edge>> pq;
for(int i = 0; i < N;i++){
for(int j = i+1; j < N;j++){
pq.push(edge(i,j,abs(ps[i]-ps[j])));
}
}
UnionFind UF(N);
while(pq.size()){
auto e = pq.top(); pq.pop();
//cout << e.u << " " << e.v << " " << e.cost << endl;
if(UF.same(e.u,e.v)) continue;
UF.unite(e.u,e.v);
if(UF.same(0,N-1)) break;
}
vector<int> group;
for(int i = 0; i < N;i++){
if(UF.same(0,i)) group.push_back(i);
}
vector<ld> maxLen(N,LINF);
queue<int> q; q.push(0); maxLen[0] = 0;
while(q.size()){
ll n = q.front(); q.pop();
for(auto next:group){
if(n == next) continue;
ld len = abs(ps[n]-ps[next]);
if(maxLen[next] > max(maxLen[n],len)){
maxLen[next] = max(maxLen[n],len);
q.push(next);
}
}
}
ld maxL = maxLen[N-1];
res = ceil(maxL/10)*10;
return res;
}
int main(void) {
cin.tie(0); ios_base::sync_with_stdio(false);
cout << solve() << endl;
return 0;
}
kei