Submission #889956

#	Time	Username	Problem	Language	Result	Execution time	Memory
889956		abcvuitunggio	Towns (IOI15_towns)	C++17	35 / 100	14 ms	532 KiB

towns

#include "towns.h"
#include <bits/stdc++.h>
using namespace std;
int dist[111][111],C[111];
int d(int u, int v){
    if (u==v)
        return 0;
    if (u>v)
        swap(u,v);
    if (dist[u][v])
        return dist[u][v];
    return dist[u][v]=getDistance(u,v);
}
int hubDistance(int N, int sub){
    memset(dist,0,sizeof(dist));
    pair <int, int> mx={0,-1};
    for (int i=0;i<N;i++)
        mx=max(mx,{d(0,i),i});
    int u=mx.second;
    mx={0,-1};
    for (int i=0;i<N;i++)
        mx=max(mx,{d(u,i),i});
    int v=mx.second;
	int R=1e9,cnt[2]={0,0};
	for (int i=0;i<N;i++)
        R=min(R,abs(d(i,u)-d(i,v)));
    vector <int> a,b,tmp;
    for (int i=0;i<N;i++){
        int val=d(i,u)-d(i,v);
        if (val<-R)
            cnt[0]++;
        if (val==-R)
            a.push_back(i);
        if (val==R)
            b.push_back(i);
        if (val>R)
            cnt[1]++;
    }
    R=(R+d(u,v))/2;
    if (max(cnt[0],cnt[1])>N/2)
        return -R;
    if (sub==4||sub<3)
        return (max(a.size(),b.size())>N/2?-R:R);
    if (min(cnt[1]+b.size(),cnt[0]+a.size())>N/2)
        return -R;
    if (a.size()>N/2&&b.size()+cnt[1]<=N/2){
        fill(C,C+N,1);
        tmp.push_back(a.back());
        a.pop_back();
        for (int i:a){
            int c=1;
            for (int j:tmp){
                int x=(d(i,u)+d(i,v)-d(u,v))/2,y=(d(j,u)+d(j,v)-d(u,v))/2;
                if (d(i,j)<x+y){
                    C[j]++;
                    if (C[j]>N/2)
                        return -R;
                    c=0;
                    break;
                }
            }
            if (c)
                tmp.push_back(i);
        }
        memset(cnt,0,sizeof(cnt));
        tmp.clear();
    }
    if (b.size()>N/2&&a.size()+cnt[0]<=N/2){
        fill(C,C+N,1);
        tmp.push_back(b.back());
        b.pop_back();
        for (int i:b){
            int c=1;
            for (int j:tmp){
                int x=(d(i,u)+d(i,v)-d(u,v))/2,y=(d(j,u)+d(j,v)-d(u,v))/2;
                if (d(i,j)<x+y){
                    C[j]++;
                    if (C[j]>N/2)
                        return -R;
                    c=0;
                    break;
                }
            }
            if (c)
                tmp.push_back(i);
        }
        tmp.clear();
    }
    return R;
}

Compilation message (stderr)

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:43:39: warning: comparison of integer expressions of different signedness: 'const long unsigned int' and 'int' [-Wsign-compare]
   43 |         return (max(a.size(),b.size())>N/2?-R:R);
      |                 ~~~~~~~~~~~~~~~~~~~~~~^~~~
towns.cpp:44:45: warning: comparison of integer expressions of different signedness: 'const long unsigned int' and 'int' [-Wsign-compare]
   44 |     if (min(cnt[1]+b.size(),cnt[0]+a.size())>N/2)
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
towns.cpp:46:17: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   46 |     if (a.size()>N/2&&b.size()+cnt[1]<=N/2){
      |         ~~~~~~~~^~~~
towns.cpp:46:38: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   46 |     if (a.size()>N/2&&b.size()+cnt[1]<=N/2){
      |                       ~~~~~~~~~~~~~~~^~~~~
towns.cpp:68:17: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   68 |     if (b.size()>N/2&&a.size()+cnt[0]<=N/2){
      |         ~~~~~~~~^~~~
towns.cpp:68:38: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   68 |     if (b.size()>N/2&&a.size()+cnt[0]<=N/2){
      |                       ~~~~~~~~~~~~~~~^~~~~

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