Submission #805603

#	Time	Username	Problem	Language	Result	Execution time	Memory
805603		FatihSolak	Towns (IOI15_towns)	C++17	25 / 100	13 ms	852 KiB

towns

#include "towns.h"
#include <bits/stdc++.h>
using namespace std;
int hubDistance(int N, int sub) {
	map<int,int> d[N];
	auto get = [&](int a,int b){
		if(a > b)
			swap(a,b);
		if(d[a].count(b))
			return d[a][b];
		if(a == b)
			return 0;
		return d[a][b] = getDistance(a,b);
	};
	int v = 0;
	for(int i = 0;i<N;i++){
		if(get(0,i) > get(0,v)){
			v = i;
		}
	}
	int x = 0;
	for(int i = 0;i<N;i++){
		if(get(v,i) > get(v,x)){
			x = i;
		}
	}
	int len = get(v,x);
	// cout << v << ' ' << x << ' ' << len << endl;
	map<int,vector<int>> mp;
	for(int i = 0;i<N;i++){
		int val = (get(0,i) + get(0,v) - get(v,i))/2;
		mp[val].push_back(i);
	}
	int val1 = 0;
	int val2 = 2e9;
	int ans;
	for(auto u:mp){
		int tmp = get(0,v) - u.first;
		// cout << tmp << endl;
		if(tmp <= len/2){
			val1 = max(val1,tmp);
		}
		if((len + 1)/2 <= tmp){
			val2 = min(val2,tmp);
		}
	}
	// cout << val1 << ' ' << val2 << endl;
	ans = len - val1;
	if(val2 != len - val1){
		if(val2 < len - val1){
			ans = val2;
			val1 = -1;
		}
		else val2 = -1;
	}
	return -ans;
}

Compilation message (stderr)

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:4:28: warning: unused parameter 'sub' [-Wunused-parameter]
    4 | 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