oj.uz

Submission #60228

# Submission time Handle Problem Language Result Execution time Memory
60228 2018-07-23T22:00:00 Z reality Towns (IOI15_towns) C++17
25 / 100
 33 ms 928 KB 
#include "towns.h"
#include "bits/stdc++.h"
using namespace std;
#define fi first
#define se second
#define ll long long
#define dbg(v) cerr<<#v<<" = "<<v<<'\n'
#define vi vector<int>
#define vl vector <ll>
#define pii pair<int,int>
#define mp make_pair
#define db long double
#define pb push_back
#define all(s) s.begin(),s.end()
template < class T > T smin(T &a,T b) {if (a > b) a = b;return a;}
template < class T > T smax(T &a,T b) {if (a < b) a = b;return a;}

const int N = 256;

int D[N][N];

int get(int x,int y) {
	if (D[x][y] != -1)
		return D[x][y];
	return D[x][y] = D[y][x] = getDistance(x,y);
}

int hubDistance(int n, int sub) {
	memset(D,-1,sizeof(D));
	int x = 0;
	for (int i = 0;i < n;++i)
		D[i][i] = 0;
	for (int i = 0;i < n;++i)
		if (get(0,i) > get(0,x))
			x = i;
	int y = x;
	for (int i = 0;i < n;++i)
		if (get(x,i) > get(x,y))
			y = i;
	vi s;
	map < int , int > M;
	for (int k = 0;k < n;++k)
		s.pb((get(x,y) - (get(x,k) - get(y,k))) / 2),++M[s.back()];
	sort(all(s));
	s.resize(unique(all(s)) - s.begin());
	int ans = 2e9;
	for (auto it : s)
		smin(ans,max(it,D[x][y] - it));
	//if (sub <= 2)
	//	return ans;
	for (auto dist : s)
		if (max(dist,D[x][y] - dist) == ans) {
			int a = 0,b = 0;
			for (auto it : M) {
				if (it.fi < dist)
					a += it.se;
				if (dist < it.fi)
					b += it.se;
			}
			vi v;
			for (int k = 0;k < n;++k)
				if (get(x,y) - (get(x,k) - get(y,k)) == 2 * dist)
					v.pb(k);
			int sz = v.size();
			int c = 0;
			for (int k = 1;k < sz;++k)
				if (get(y,v[k]) + get(y,v[0]) - get(v[0],v[k]) == 2 * dist)
					++c;
			int d = n - a - b - c;
			if (max({a,b,c,d}) <= (n / 2))
				return ans;
		}
	return -ans;
}

Compilation message

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:64:19: warning: conversion to 'int' from 'std::vector<int>::size_type {aka long unsigned int}' may alter its value [-Wconversion]
    int sz = v.size();
             ~~~~~~^~
towns.cpp:28:28: warning: unused parameter 'sub' [-Wunused-parameter]
 int hubDistance(int n, int sub) {
                            ^~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 632 KB Output is correct
2 Correct 19 ms 632 KB Output is correct
3 Correct 3 ms 648 KB Output is correct
4 Correct 23 ms 724 KB Output is correct
5 Correct 26 ms 724 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 800 KB Output is correct
2 Correct 26 ms 800 KB Output is correct
3 Correct 33 ms 800 KB Output is correct
4 Correct 24 ms 800 KB Output is correct

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 28 ms 800 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 24 ms 928 KB Output isn't correct

Subtask #5
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 29 ms 928 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 39.0

# Verdict Execution time Memory Grader output
1 Incorrect 30 ms 928 KB Output isn't correct
2 Halted 0 ms 0 KB -