Submission #104417

#	Time	Username	Problem	Language	Result	Execution time	Memory
104417		figter001	Towns (IOI15_towns)	C++17	0 / 100	18 ms	640 KiB

towns

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

using namespace std;

typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
const int nax = 120;

int n,dis[nax][nax],ans;

int query(int a,int b){
	if(dis[a][b] != 0)
		return dis[a][b];
	dis[a][b] = dis[b][a] = getDistance(a,b);
	return dis[a][b];
}

int far(int u){
	int mx = 0,v = -1;
	for(int i=0;i<n;i++){
		if(i == u)
			continue;
		int cur = query(u,i);
		if(cur > mx){
			mx = cur; 
			v = i;
		}
	}
	return v;
}

int hubDistance(int N, int sub){
	n = N;
	int a = far(0);
	int b = far(a);
	far(b);
	ans = 2e9;
	for(int i=0;i<n;i++){
		if(a == i || b == i)
			continue;
		// int disa = query(i,a);
		// int disb = query(i,b);
		int cur = (dis[a][i] + dis[b][i] - dis[a][b]) / 2;
		ans = min(ans,max(dis[a][i],dis[b][i]) - cur);
	}
	if(sub == 1 || sub == 2)
		return ans;
	else 
		assert(0);
}

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