Submission #494642

#	Time	Username	Problem	Language	Result	Execution time	Memory
494642		thecodingwizard	Towns (IOI15_towns)	C++11	25 / 100	16 ms	852 KiB

towns

#include <bits/stdc++.h>
#include "towns.h"

using namespace std;

#define ii pair<int, int>
#define mp make_pair

map<ii, int> cached;
int getD(int a, int b) {
    if (a > b) swap(a, b);
    if (cached.count(mp(a, b))) return cached[mp(a, b)];
    return cached[mp(a, b)] = getDistance(a, b);
}

int hubDistance(int N, int sub) {
    cached.clear();
	int maxDist = -1, maxDistNode = -1;
	for (int i = 1; i < N; i++) {
		int d = getD(0, i);
		if (d > maxDist) {
			maxDist = d;
			maxDistNode = i;
		}
	}
    maxDist = -1;
    int maxDistNode2 = -1;
	for (int i = 0; i < N; i++) {
		int d = getD(maxDistNode, i);
		if (d > maxDist) {
			maxDist = d;
			maxDistNode2 = i;
		}
	}
    int opt = 1e9;
	for (int i = 0; i < N; i++) {
        int distTo0 = getD(maxDistNode2, i);
        int distTo1 = getD(maxDistNode, i);
        int dist0 = (maxDist + distTo0 - distTo1)/2;
        int dist1 = (maxDist + distTo1 - distTo0)/2;
        opt = min(opt, max(dist0, dist1));
    }
    return opt;
}

Compilation message (stderr)

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:16:28: warning: unused parameter 'sub' [-Wunused-parameter]
   16 | 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