This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#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> fi;
int hubDistance(int N, int sub) {
p1 = {0,0};
p2 = {0,0};
fi.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];
fi[i1 - (i1+i2-diam)/2]++;
}
int jacontei = 1;
bool iscentroid = 0;
for(map<int,int> :: iterator it = fi.begin(); it != fi.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) {
| ~~~~^~~
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