Submission #670878

#	Time	Username	Problem	Language	Result	Execution time	Memory
670878		LittleCube	Towns (IOI15_towns)	C++14	25 / 100	14 ms	352 KiB

towns

#include "towns.h"
#include <bits/stdc++.h>
#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define F first
#define S second
using namespace std;

int hubDistance(int N, int sub)
{
	vector<int> disU(N, 0), disV(N, 0);
	map<pii, int> mp;
	int u = 0, v = 0, mx = 0, uv, R = 1e9;
	for (int i = 1; i < N; i++)
	{
		int cur = getDistance(0, i);
		if (cur > mx)
			u = i, mx = cur;
	}
	for (int i = 0; i < N; i++)
		disU[i] = getDistance(u, i);
	mx = 0;
	for (int i = 0; i < N; i++)
		if (disU[i] > mx)
			v = i, mx = disU[i];
	for (int i = 0; i < N; i++)
		disV[i] = getDistance(v, i);
	uv = getDistance(u, v);
	for (int i = 0; i < N; i++)
	{
		int d = (disU[i] + disV[i] - uv) / 2;
		R = min(R, max(disU[i] - d, disV[i] - d));
		mp[pii(disU[i] - d, disV[i] - d)]++;
	}
	int cnt = 0;
	for(auto [p, k] : mp)
		if(p.F == R || p.S == R)
		{
			if(cnt <= N / 2 && k <= N / 2 && (N - cnt - k) <= N / 2)
				return R;
			cnt += k; 
		}
	return -R;
}

Compilation message (stderr)

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:37:11: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   37 |  for(auto [p, k] : mp)
      |           ^
towns.cpp:10:28: warning: unused parameter 'sub' [-Wunused-parameter]
   10 | int hubDistance(int N, int sub)
      |                        ~~~~^~~

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