oj.uz

Submission #210977

# Submission time Handle Problem Language Result Execution time Memory
210977 2020-03-19T04:48:36 Z autumn_eel Towns (IOI15_towns) C++14
48 / 100
 31 ms 1024 KB 
#include "towns.h"
#include <bits/stdc++.h>
#define rep(i,n)for(int i=0;i<(n);i++)
using namespace std;

int d[150][150];
int dist(int i,int j){
	if(i==j)return 0;
	if(i>j)swap(i,j);
	if(d[i][j]!=-1)return d[i][j];
	int x=getDistance(i,j);
	return d[i][j]=x;
}

int hubDistance(int N, int sub) {
	memset(d,-1,sizeof(d));
	int Max=0,s=-1;
	rep(i,N){
		if(Max<dist(0,i)){
			Max=dist(0,i);
			s=i;
		}
	}
	Max=0;int t=-1;
	rep(i,N){
		if(Max<dist(s,i)){
			Max=dist(s,i);
			t=i;
		}
	}
	int Min=INT_MAX;
	set<int>idx;
	map<int,vector<int>>mp;
	rep(i,N){
		int x=dist(s,i),y=dist(t,i);
		int z=(x+y-Max)/2;
		int a=x-z,b=y-z;
		mp[a].push_back(i);
		if(Min>max(a,b)){
			Min=max(a,b);
			idx.clear();
		}
		if(Min==max(a,b)){
			idx.insert(a);
		}
	}
	if(sub<=2)return Min;
	auto C=[&](int id){
		int c1=0,c2=0;
		for(auto p:mp){
			if(p.first<id)c1+=p.second.size();
			if(p.first>id)c2+=p.second.size();
		}
		if(c1>N/2||c2>N/2)return false;
		vector<vector<int>>vs;
		for(int v:mp[id]){
			bool flag=false;
			for(auto&V:vs){
				if(dist(s,V[0])+dist(s,v)-2*id!=dist(V[0],v)){
					V.push_back(v);flag=true;
					if(V.size()>N/2)return false;
					break;
				}
			}
			if(!flag)vs.push_back({v});
		}
		return true;
	};

	for(int id:idx){
		if(C(id))return Min;
	}
	return -Min;
}

Compilation message

towns.cpp: In lambda function:
towns.cpp:51:36: warning: conversion to 'int' from 'std::vector<int>::size_type {aka long unsigned int}' may alter its value [-Wconversion]
    if(p.first<id)c1+=p.second.size();
                                    ^
towns.cpp:52:36: warning: conversion to 'int' from 'std::vector<int>::size_type {aka long unsigned int}' may alter its value [-Wconversion]
    if(p.first>id)c2+=p.second.size();
                                    ^
towns.cpp:61:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      if(V.size()>N/2)return false;
         ~~~~~~~~^~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 384 KB Output is correct
2 Correct 21 ms 512 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 28 ms 384 KB Output is correct
5 Correct 28 ms 384 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 512 KB Output is correct
2 Correct 21 ms 384 KB Output is correct
3 Correct 29 ms 504 KB Output is correct
4 Correct 30 ms 384 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 512 KB Output is correct
2 Correct 27 ms 1024 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 28 ms 1024 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 31 ms 512 KB Output is correct

Subtask #5
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 5 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 39.0

# Verdict Execution time Memory Grader output
1 Incorrect 5 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -