Submission #1088407

#	Time	Username	Problem	Language	Result	Execution time	Memory
1088407		Pacybwoah	Towns (IOI15_towns)	C++17	35 / 100	11 ms	960 KiB

towns

#include "towns.h"
#include<vector>
#include<algorithm>
#include<utility>
#include<map>
using namespace std;

int hubDistance(int N, int sub) {
	int a = -1, b = -1;
	int maxi = 0, n = N;
	for(int i = 1; i < n; i++){
		int len = getDistance(0, i);
		if(len > maxi){
			maxi = len;
			a = i;
		}
	}
	vector<int> dista(n), distb(n);
	maxi = 0;
	for(int i = 0; i < n; i++){
		dista[i] = getDistance(a, i);
		if(dista[i] > maxi){
			maxi = dista[i];
			b = i;
		}
	}
	for(int i = 0; i < n; i++){
		distb[i] = getDistance(b, i);
	}
	int d = dista[b];
	int ans = 1e9;
	for(int i = 0; i < n; i++){
		int da = (d + dista[i] + distb[i]) / 2 - distb[i], db = (d + dista[i] + distb[i]) / 2 - dista[i];
		ans = min(ans, max(da, db));
	}
	if(sub == 4){
		map<int, int> m;
		for(int i = 0; i < n; i++){
			m[(d + distb[i] + dista[i]) / 2 - distb[i]]++;
		}
		int sum = 0;
		bool flag = 0;
		for(auto &[len, val]: m){
			if(max(len, d - len) == ans){
				if(max(val, max(sum, n - sum - val)) <= n / 2) flag = 1;
			}
			sum += val;
		}
		if(flag) return ans;
		else return -ans;
	}
	return ans;
}
// g++ -std=c++17 -Wall -Wextra -fsanitize=undefined -fsanitize=address -Wshadow -o run towns.cpp grader.cpp

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