結果

問題 No.2955 Pizza Delivery Plan
ユーザー GOTKAKO
提出日時 2024-11-08 22:07:32
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 124 ms / 2,000 ms
コード長 2,638 bytes
コンパイル時間 2,214 ms
コンパイル使用メモリ 206,576 KB
最終ジャッジ日時 2025-02-25 02:49:06
ジャッジサーバーID
(参考情報)
judge3 / judge1
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ファイルパターン 結果
sample AC * 3
other AC * 28
権限があれば一括ダウンロードができます

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;
template<typename T>
struct Point{
public:
T x,y;
Point() : x(0),y(0) {}
Point(T a,T b) : x(a),y(b) {}
Point &operator=(const Point &b) = default;
Point operator+(const Point &b){return Point(x+b.x,y+b.y);}
Point operator-(const Point &b){return Point(x-b.x,y-b.y);}
Point operator+=(const Point &b){return *this=*this+b;}
Point operator-=(const Point &b){return *this=*this-b;}
bool operator==(const Point &b){return x==b.x && y==b.y;}
bool operator!=(const Point &b){return x!=b.x || y!=b.y;}
bool operator<(const Point &b){
if(x == b.x) return y < b.y;
else return x < b.x;
}
bool operator<=(const Point &b){return (*this) < b || (*this) == b;}
bool operator>(const Point &b){return !((*this) <= b);}
bool operator>=(const Point &b){return !((*this) < b);}
friend T inner(const Point a,const Point b){return a.x*b.x+a.y*b.y;}
friend T cross(const Point a,const Point b){return a.x*b.y-a.y*b.x;}
friend T twodist(const Point a,const Point b){return sqrtl((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y));}
};
template<typename T>
istream &operator>>(istream &is,Point<T> &a){
is >> a.x >> a.y;
return is;
}
template<typename T>
ostream &operator<<(ostream &os,Point<T> &a){
os << a.x << " " << a.y;
return os;
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
int N,K; cin >> N >> K;
vector<Point<double>> P(N);
for(auto &p : P) cin >> p;
int n2 = 1<<N;
vector<vector<vector<double>>> dp(n2,vector<vector<double>>(N,vector<double>(K,1e100)));
for(int i=0; i<N; i++) dp.at(1<<i).at(i).at(K-1) = twodist({0.0,0.0},P.at(i));
for(int i=1; i<n2; i++){
for(int k=0; k<N; k++){
if(!(i&(1<<k))) continue;
int left = i-(1<<k);
for(int l=0; l<N; l++){
if(!(i&(1<<l))) continue;
double mind = dp.at(left).at(l).at(0);
for(int m=0; m<K-1; m++){
dp.at(i).at(k).at(m) = min(dp.at(i).at(k).at(m),dp.at(left).at(l).at(m+1)+twodist(P.at(k),P.at(l)));
mind = min(mind,dp.at(left).at(l).at(m+1));
}
dp.at(i).at(k).at(K-1) = min(dp.at(i).at(k).at(K-1),mind+twodist({0,0},P.at(l))+twodist({0,0},P.at(k)));
}
}
}
double answer = 1e100;
for(int i=0; i<N; i++){
double nowd = twodist({0,0},P.at(i));
for(int k=0; k<K; k++) answer = min(answer,dp.at(n2-1).at(i).at(k)+nowd);
}
cout << fixed << setprecision(20) << answer << endl;
}
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