Submission #615974

#	Time	Username	Problem	Language	Result	Execution time	Memory
615974		Lucpp	Towns (IOI15_towns)	C++17	25 / 100	17 ms	348 KiB

towns

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

int hubDistance(int n, int sub) {
	sub--; // suppress unused warning
	vector<int> d0(n), du(n);
	for(int i = 1; i < n; i++) d0[i] = getDistance(0, i);
	int u = int(max_element(d0.begin(), d0.end())-d0.begin());
	for(int i = 0; i < n; i++) if(u!=i) du[i] = getDistance(u, i);
	int v = int(max_element(du.begin(), du.end())-du.begin());
	int dia = du[v];
	int maxB = 0, maxC = 0;
	for(int i = 0; i < n; i++){
		int b = (d0[u]+d0[i]-du[i])/2;
		int c = d0[u]-b;
		if(b+du[v]-d0[u] <= dia/2) maxB = max(maxB, b);
		if(c <= dia/2) maxC = max(maxC, c);
	}
	int R = min(d0[u]-maxB, dia-maxC);
	return R;
}

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