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Submission #1018868

# Submission time Handle Problem Language Result Execution time Memory
1018868 2024-07-10T10:24:42 Z parsadox2 Towns (IOI15_towns) C++17
26 / 100
 21 ms 1044 KB 
#include "towns.h"
#include <bits/stdc++.h>
 
#define F first
#define S second
 
using namespace std;
 
const int N = 1e2 + 20;
int n , dis[N][N] , r[N] , L[N] , R[N] , cnt[N];
 
bool Solve(int D)
{
	int lef = 0 , rig = 0 , mid = 0;
	for(int x = 0 ; x < n ; x++)
		cnt[x] = 0;
	vector <int> vec;
	int mx = -1 , cnt = 0;
	for(int x = 0 ; x < n ; x++)
	{
		if(L[x] < D)
			lef++;
		else if(L[x] > D)
			rig++;
		else
		{
			if(cnt == 0)
			{
				cnt = 1;
				mx = x;
				continue;
			}
			else
			{
				dis[mx][x] = dis[x][mx] = getDistance(x , mx);
				if(dis[x][mx] != r[x] + r[mx])
					cnt++;
				else
					cnt--;
			}
		}
	}
	mid = 1;
	for(int x = 0 ; x < n ; x++)  if(L[x] == D && x != mx)
	{
		dis[x][mx] = dis[mx][x] = getDistance(x , mx);
		if(dis[x][mx] != r[x] + r[mx])
			mid++;
	}
	return (lef <= n / 2 && rig <= n/2 && mid <= n / 2);
}

bool Solvec(int D)
{
	int lef = 0 , rig = 0 , mid = 0;
	for(int x = 0 ; x < n ; x++)
		cnt[x] = 0;
	vector <int> vec;
	for(int x = 0 ; x < n ; x++)
	{
		if(L[x] < D)
			lef++;
		else if(L[x] > D)
			rig++;
		else
		{
			bool flg = false;
			for(auto u : vec)
			{
				dis[u][x] = dis[x][u] = getDistance(u , x);
				if(dis[u][x] != r[u] + r[x])
				{
					flg = true;
					cnt[u]++;
					break;
				}
			}
			if(!flg)
			{
				vec.push_back(x);
				cnt[x] = 1;
			}
		}
	}
	for(int i = 0 ; i < n ; i++)
		mid = max(mid , cnt[i]);
	return (lef <= n / 2 && rig <= n/2 && mid <= n / 2);
}

int hubDistance(int nn , int sub) {
	n = nn;
	pair <int , int> D = make_pair(0 , 1);
	for(int i = 1 ; i < n ; i++)
	{
		dis[0][i] = dis[i][0] = getDistance(0 , i);
		if(dis[0][i] > dis[D.F][D.S])
			D = make_pair(0 , i);
	}
	for(int i = 0 ; i < n ; i++)  if(i != D.S)
	{
		dis[i][D.S] = dis[D.S][i] = getDistance(i , D.S);
		if(dis[i][D.S] > dis[D.F][D.S])
			D = make_pair(i , D.S);
	}
	int ans = dis[D.F][D.S];
	for(int x = 0 ; x < n ; x++)
	{
		dis[x][D.F] = dis[D.F][x] = getDistance(x , D.F);
		r[x] = (dis[x][D.F] + dis[x][D.S] - dis[D.F][D.S]) / 2;
		L[x] = dis[x][D.F] - r[x];
		R[x] = dis[x][D.S] - r[x];
		//cout << x << " : " << L[x] << " " << R[x] << endl;
		ans = min(ans , max(L[x] , R[x]));
	}
	ans = -ans;
	set <int> st;
	for(int x = 0 ; x < n ; x++)  if(L[x] == abs(ans) || R[x] == abs(ans))
	{
		st.insert(L[x]);
	}
	/*if(st.size() == 2)
	{
		int lef = 0 , rig = 0;
		for(int i = 0 ; i < n ; i++)
		{
			if(L[i] <= abs(ans))
				lef++;
			else
				rig++;
		}
		if(lef > n / 2)
		{
			auto it = st.end();  it--;
			st.erase(it);
		}
		else if(rig > n / 2)
		{
			st.erase(st.begin());
		}
		else
		{
			return abs(ans);
		}
	}*/
	for(auto ch : st) if(Solvec(ch))
		ans = abs(ans);
	return ans;
}

Compilation message

towns.cpp: In function 'bool Solve(int)':
towns.cpp:18:16: warning: declaration of 'cnt' shadows a global declaration [-Wshadow]
   18 |  int mx = -1 , cnt = 0;
      |                ^~~
towns.cpp:10:42: note: shadowed declaration is here
   10 | int n , dis[N][N] , r[N] , L[N] , R[N] , cnt[N];
      |                                          ^~~
towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:90:30: warning: unused parameter 'sub' [-Wunused-parameter]
   90 | int hubDistance(int nn , int sub) {
      |                          ~~~~^~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 860 KB Output is correct
2 Correct 10 ms 996 KB Output is correct
3 Correct 0 ms 444 KB Output is correct
4 Correct 16 ms 1032 KB Output is correct
5 Correct 21 ms 860 KB Output is correct

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 860 KB Output is correct
2 Correct 12 ms 860 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 14 ms 1044 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 39.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -