Submission #30729

#	Time	Username	Problem	Language	Result	Execution time	Memory
30729		rondojim	Towns (IOI15_towns)	C++14	35 / 100	193 ms	25548 KiB

towns

#include "towns.h"
#include <bits/stdc++.h>
using namespace std ;
#define ii pair<int,int>
#define vi vector<int>
#define fi first
#define se second
#define vii vector<ii> 
 
int from[105] , to[105] , dist[105][105] ;
vii len[1000010] ;
 
int hubDistance(int n, int sub) {
	memset(dist , -1 , sizeof dist) ;
	int mdist = -1 , opt = -1 , tmp ; 
	for(int i=0;i<n;i++){
		tmp = getDistance(0 , i) ;
		if(mdist < tmp){
			mdist = tmp ;
			opt = i ;
		}
	}
	mdist = -1 ;
	int nxt = -1 ;
	for(int i=0;i<n;i++){
		from[i] = getDistance(opt , i) ;
		if(from[i] > mdist){
			mdist = from[i] ;
			nxt = i;
		}
	}
	for(int i=0;i<n;i++) to[i] = getDistance(nxt , i ) ;
	for(int i=1;i<=1000000;i++) len[i].clear() ;
	int res = 1e9 ; 
	for(int i=0;i<n;i++){
		if(i == nxt ||i == opt) continue ;
		int ok = (from[i] + to[i] - mdist)/2 ;
		int ln = from[i] - ok ; 
		len[ln].push_back({i , ok }) ;
		res = min(res , max( mdist - ln , ln ) ) ;
	}
	if(sub <= 2) return res ;
 
	if(sub == 4){
		int sum = 1 ;
		bool chk = 0 ;
		for(int i=1;i<=mdist;i++){
			if(len[i].empty()) continue ;
			if(max(i , mdist - i) == res) {
				if( (int)len[i].size() <= n/2 && sum<=n/2 && n - sum - (int)len[i].size() <= n/2 ) chk = 1 ;
			}
			sum += (int)len[i].size() ;
		}
		if(chk ) return res ;
		else return -res  ;
	}
 
}

Compilation message (stderr)

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:58:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

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