Submission #119758

#	Time	Username	Problem	Language	Result	Execution time	Memory
119758		WhipppedCream	Towns (IOI15_towns)	C++17	0 / 100	18 ms	452 KiB

towns

#include "towns.h"
#include <bits/stdc++.h>
#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")
using namespace std;
#define X first
#define Y second
#define pb push_back
typedef pair<int, int> ii;
typedef long long ll;

const int maxn = 120;

int m, n;

int dist0[maxn];
int distu[maxn];
int add[maxn], bran[maxn];

map<int, int> cnt;

int hubDistance(int N, int sub)
{
	cnt.clear();
	if(sub > 2 && sub != 4) return 0;
	n = N;
	int best = 0, dat = -1;
	for(int i = 1; i< N; i++)
	{
		dist0[i] = getDistance(0, i);
		if(dist0[i]> best)
		{
			best = dist0[i];
			dat = i;
		}
	}
	int U = dat;
	best = 0; dat = -1;
	for(int i = 0; i< N; i++)
	{
		if(i == U || i == 0) continue;
		distu[i] = getDistance(U, i);
		if(distu[i]> best)
		{
			best = distu[i];
			dat = i;
		}
	}
	int diam = best;
	int V = dat;
	// printf("(%d->%d) %d\n", U, V, dist[V]);
	for(int i = 0; i< N; i++)
	{
		if(i == U || i == 0) continue;
		int br = dist0[i]+distu[i]-dist0[U];
		br /= 2;
		int pos = dist0[i]-br;
		add[i] = pos;
		bran[i] = br;
		cnt[pos]++;
	}
	if(!V)
	{
		add[V] = bran[V] = 0;
	}
	int rad = 1e9;
	int cm = 1;
	bool good = false;
	for(auto kk : cnt)
	{
		int x = kk.X, y = kk.Y;
		// printf("%d: %d\n", x, cnt[x]);
		if(x< add[V]) continue;
		rad = min(rad, max(x-add[V]+bran[V], dist0[U]-x));
	}
	return rad;
}

Compilation message (stderr)

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:71:17: warning: unused variable 'y' [-Wunused-variable]
   int x = kk.X, y = kk.Y;
                 ^
towns.cpp:49:6: warning: unused variable 'diam' [-Wunused-variable]
  int diam = best;
      ^~~~
towns.cpp:67:6: warning: unused variable 'cm' [-Wunused-variable]
  int cm = 1;
      ^~
towns.cpp:68:7: warning: unused variable 'good' [-Wunused-variable]
  bool good = false;
       ^~~~

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