Submission #400244

#	Time	Username	Problem	Language	Result	Execution time	Memory
400244		bigg	Towns (IOI15_towns)	C++14	35 / 100	26 ms	460 KiB

towns

#include "towns.h"
#include<bits/stdc++.h>
using namespace std;

const int MAXN = 1e6;

int dist[5][MAXN];
pair<int, int> p1, p2;
map<int, int> AB;
int hubDistance(int N, int sub) {
	p1 = {0,0};
	p2 = {0,0};
	AB.clear();
	for(int i = 0; i < N; i++){
		int d = getDistance(0, i);
		if(d > p1.second) p1 = {i,d};
	}	
	for(int i = 0; i < N; i++){
	
		dist[0][i] = getDistance(i, p1.first);
		if(dist[0][i] > p2.second) p2 = { i, dist[0][i]};
	}
	for(int i = 0; i < N; i++){
		
		dist[1][i] = getDistance(i, p2.first);
	}
	int ans = MAXN;
	int diam = dist[0][p2.first];
	for(int i = 0; i < N; i++) ans = min(ans, (diam + abs(dist[0][i] - dist[1][i]))/2);

	for(int i = 0; i < N; i++){
		if(i == p1.first || i == p2.first) continue;
		int i1 = dist[0][i], i2 = dist[1][i];
		AB[i1 - (i1+i2-diam)/2]++;
	}
	int jacontei = 1;
	bool iscentroid = 0;
	for(map<int,int> :: iterator it = AB.begin(); it != AB.end(); it++){
		if(it->first == ans || it->first == diam - ans){
			if(jacontei <= N/2 && N - jacontei - it->second <= N/2 && it->second <= N/2) iscentroid = 1;
		}
		jacontei += it->second;
	}
	if(!iscentroid) ans = -ans;
	return ans;              
}

Compilation message (stderr)

towns.cpp: In function 'int hubDistance(int, int)':
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: 10 / 10
• Subtask 5: 0 / 13
• Subtask 6: 0 / 39