Submission #1090623

#	Time	Username	Problem	Language	Result	Execution time	Memory
1090623		owoovo	Towns (IOI15_towns)	C++17	35 / 100	16 ms	1116 KiB

towns

#include "towns.h"
#include<bits/stdc++.h>
#define ll long long
#define F first 
#define S second 
using namespace std;
const ll maxn=1e18;
ll to0[120],tor1[120],tor2[120];
ll r1,r2;
int hubDistance(int N, int sub) {
	for(int i=1;i<N;i++)to0[i]=getDistance(0,i);
	ll maxn=0,pos=0;
	for(int i=0;i<N;i++){
		if(to0[i]>maxn){
			maxn=to0[i];
			pos=i;
		}
	}
	r1=pos;
	for(int i=0;i<N;i++)tor1[i]=getDistance(r1,i);
	maxn=0,pos=0;
	for(int i=0;i<N;i++){
		if(tor1[i]>maxn){
			maxn=tor1[i];
			pos=i;
		}
	}
	r2=pos;
	for(int i=0;i<N;i++)tor2[i]=getDistance(r2,i);
	vector<pair<ll,ll>> vc;
	for(int i=0;i<N;i++){
		//cout<<i<<" "<<tor1[r2]<<" "<<tor1[i]<<" "<<tor2[i]<<"\n";
		ll dis=(tor1[r2]+tor1[i]-tor2[i])/2;
		vc.push_back({dis,tor1[i]-dis});
	}
	ll ans=maxn;
	for(int i=0;i<N;i++){
		ans=min(ans,max(vc[i].F,tor1[r2]-vc[i].F));
	}
	vector<ll> want;
	for(int i=0;i<N;i++){
		if(ans==max(vc[i].F,tor1[r2]-vc[i].F)){
			want.push_back(vc[i].F);
		}
	}
	int ok=0;
	for(auto dis:want){
		int s=0,m=0,l=0;
		for(int i=0;i<N;i++){
			if(vc[i].F<dis)s++;
			else if(vc[i].F==dis)m++;
			else l++;
		}
		if(s<=N/2&&m<=N/2&&l<=N/2)ok=1;
	}
	return ok==1?ans:-ans;
}

Compilation message (stderr)

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:12:5: warning: declaration of 'maxn' shadows a global declaration [-Wshadow]
   12 |  ll maxn=0,pos=0;
      |     ^~~~
towns.cpp:7:10: note: shadowed declaration is here
    7 | const ll maxn=1e18;
      |          ^~~~
towns.cpp:20:42: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   20 |  for(int i=0;i<N;i++)tor1[i]=getDistance(r1,i);
      |                                          ^~
towns.cpp:29:42: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   29 |  for(int i=0;i<N;i++)tor2[i]=getDistance(r2,i);
      |                                          ^~
towns.cpp:56:14: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   56 |  return ok==1?ans:-ans;
      |         ~~~~~^~~~~~~~~
towns.cpp:10:28: warning: unused parameter 'sub' [-Wunused-parameter]
   10 | int hubDistance(int N, int sub) {
      |                        ~~~~^~~

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