Submission #400299

#	Time	Username	Problem	Language	Result	Execution time	Memory
400299		Kenzo_1114	Towns (IOI15_towns)	C++17	35 / 100	22 ms	396 KiB

towns

#include<bits/stdc++.h>
#include "towns.h"
using namespace std;
const int MAXN = 110;
const int MAXD = 1e6 + 10;

int dist[MAXN][MAXN];

int hubDistance(int N, int sub)
{
	int A = 0, B = 0;
	for(int i = 1; i < N; i++)
	{
		dist[0][i] = dist[i][0] = getDistance(0, i);
		if(dist[0][i] > dist[0][A])	A = i;
	}

	B = A;
	for(int i = 0; i < N; i++)
	{
		if(i != 0 && i != A)
			dist[A][i] = dist[i][A] = getDistance(A, i);
		if(dist[A][i] > dist[A][B])	B = i;
	}

	if(B != 0)
		for(int i = 1; i < N; i++)
			if(i != A)	
				dist[B][i] = dist[i][B] = getDistance(B, i);

	int d = dist[A][B], R = d, DA = d;
	for(int i = 0; i < N; i++)
	{
		if(i == A || i == B)	continue;

		int da = dist[A][B] + dist[A][i] - dist[i][B];
		da /= 2;

		if(max(da, d - da) <= R)	DA = da;
		R = min(R, max(da, d - da));
	}

	int s[3] = {1, 0, 1};
	for(int i = 0; i < N; i++)
	{
		if(i == A || i == B)	continue;

		int da = dist[A][B] + dist[A][i] - dist[i][B];
		da /= 2;

		if(da < DA)	s[0]++;
		if(da == DA)s[1]++;
		if(da > DA)	s[2]++;
	}

	int mx = max(s[0], max(s[1], s[2]));
	if(mx > N / 2) R *= -1;

	return R;
}

Compilation message (stderr)

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:9:28: warning: unused parameter 'sub' [-Wunused-parameter]
    9 | int hubDistance(int N, int sub)
      |                        ~~~~^~~

• Subtask 1: 13 / 13
• Subtask 2: 12 / 12
• Subtask 3: 0 / 13
• Subtask 4: 10 / 10
• Subtask 5: 0 / 13
• Subtask 6: 0 / 39