oj.uz

Submission #105086

# Submission time Handle Problem Language Result Execution time Memory
105086 2019-04-10T13:58:29 Z Alexa2001 Towns (IOI15_towns) C++17
0 / 100
 20 ms 896 KB 
#include "towns.h"
#include <bits/stdc++.h>

using namespace std;

const int Nmax = 505;

int x, y;
int D0[Nmax], D1[Nmax], D2[Nmax], Up[Nmax], L[Nmax], R[Nmax];

map< int, vector<int> > gr;

void prepare(int n)
{
    int i;
    for(i=0; i<n; ++i) D0[i] = getDistance(0, i);

    x = max_element(D0, D0+n) - D0;

    for(i=0; i<n; ++i) D1[i] = getDistance(x, i);

    y = max_element(D1, D1+n) - D1;

    for(i=0; i<n; ++i) D2[i] = getDistance(y, i);
}


bool check(vector<int> &v, int n)
{
    if(v.size() <= n/2) return 1;

    int candidat = v[0];
    int cnt = 0;

    for(auto it : v)
        if(getDistance(candidat, it) == Up[candidat] + Up[it]) /// bucketuri diferite
        {
            --cnt;
            if(!cnt) candidat = it, cnt = 0;
        }
        else ++cnt;

    cnt = 0;
    for(auto it : v)
        if(getDistance(candidat, it) == Up[candidat] + Up[it]) ++cnt;

    return (cnt <= n/2);
}


int hubDistance(int n, int subtask)
{
    prepare(n);

    int total = D1[y];
    int ans = 2e9;
    int i;

    gr.clear();

    for(i=0; i<n; ++i)
    {
        Up[i] = D1[i] + D2[i] - total;
        assert(Up[i] % 2 == 0);
        Up[i] /= 2;

        L[i] = D1[i] - Up[i];
        R[i] = D2[i] - Up[i];

        gr[L[i]].push_back(i);

        ans = min(ans, max(L[i], R[i]));
    }

    bool balanced = 0;
    int cnt1 = 0, cnt2 = n;

    for(auto &it : gr)
    {
        cnt2 -= it.second.size();

        if(max(it.first, total - it.first) == ans && cnt1 <= n/2 && cnt2 <= n/2)
            balanced |= check(it.second, n);

        cnt1 += it.second.size();
    }

    return ans * (balanced ? 1 : -1);
}

Compilation message

towns.cpp: In function 'void prepare(int)':
towns.cpp:18:31: warning: conversion to 'int' from 'long int' may alter its value [-Wconversion]
     x = max_element(D0, D0+n) - D0;
         ~~~~~~~~~~~~~~~~~~~~~~^~~~
towns.cpp:22:31: warning: conversion to 'int' from 'long int' may alter its value [-Wconversion]
     y = max_element(D1, D1+n) - D1;
         ~~~~~~~~~~~~~~~~~~~~~~^~~~
towns.cpp: In function 'bool check(std::vector<int>&, int)':
towns.cpp:30:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(v.size() <= n/2) return 1;
        ~~~~~~~~~^~~~~~
towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:80:32: warning: conversion to 'int' from 'std::vector<int>::size_type {aka long unsigned int}' may alter its value [-Wconversion]
         cnt2 -= it.second.size();
                                ^
towns.cpp:85:32: warning: conversion to 'int' from 'std::vector<int>::size_type {aka long unsigned int}' may alter its value [-Wconversion]
         cnt1 += it.second.size();
                                ^
towns.cpp:51:28: warning: unused parameter 'subtask' [-Wunused-parameter]
 int hubDistance(int n, int subtask)
                            ^~~~~~~

Subtask #1
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 384 KB Output isn't correct

Subtask #5
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 20 ms 896 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 39.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -