제출 #556765

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
556765		blue	도시들 (IOI15_towns)	C++17	0 / 100	14 ms	352 KiB

towns

#include "towns.h"
#include <vector>
#include <cmath>
#include <set>
#include <iostream>
using namespace std;

namespace
{
	using vi = vector<int>;
}


int hubDistance(int N, int sub) 
{
	vi dist0(N);
	dist0[0] = 0;
	for(int i = 1; i < N; i++)
		dist0[i] = getDistance(0, i);

	int S = 0;
	for(int i = 1; i < N; i++)
		if(dist0[i] > dist0[S])
			S = i;

	int ST = 0; //diameter

	// cerr << "done\n";

	vi distS(N);
	distS[S] = 0;
	distS[0] = dist0[S];

	int T = 0;
	ST = distS[0];

	for(int i = 1; i < N; i++)
	{
		if(i != S)
		{
			distS[i] = getDistance(S, i);

			if(distS[i] > ST)
			{
				ST = distS[i];
				T = i;
			}
		}
	}

	// cerr << "S = " << S << "\n";


	vi diam_dist(N);
	for(int i = 0; i < N; i++)
		// diam_dist[i] = (distS[i] + dist0[i] - distS[0])/2;
		diam_dist[i] = (distS[i] + getDistance(T, i) - distS[T])/2;

	vi xcoord(N);
	for(int i = 0; i < N; i++)
		xcoord[i] = distS[i] - diam_dist[i];


	int best_diff = 5'000'000;
	set<int> best_coords;
	for(int i = 0; i < N; i++)
	{
		// int ist = 

		if(abs(2*xcoord[i] - ST) < best_diff)
		{
			best_coords.clear();
			best_diff = abs(2*xcoord[i] - ST);
		}
		
		if(abs(2*xcoord[i] - ST) == best_diff)
			best_coords.insert(xcoord[i]);
	}

	// cerr << "best coords = ";
	// for(int b : best_coords) cerr << b << ' ';
	// 	cerr << '\n';

	// cerr << "returning: \n";

	return *best_coords.rbegin();
}

컴파일 시 표준 에러 (stderr) 메시지

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:14:28: warning: unused parameter 'sub' [-Wunused-parameter]
   14 | int hubDistance(int N, int sub)
      |                        ~~~~^~~

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