Submission #832669

#	Time	Username	Problem	Language	Result	Execution time	Memory
832669		aymanrs	Towns (IOI15_towns)	C++14	25 / 100	15 ms	468 KiB

towns

#include "towns.h"
#include <bits/stdc++.h>
using namespace std;
int hubDistance(int N, int sub) {
	int md = 0, wi = 1, wii;
	for(int i = 1;i < N;i++){
		int c = getDistance(0, i);
		if(c > md){
			md = c;
			wi = i;
		}
	}
	int d[N], dw[N];
	d[wi]=0;
	md = 0;
	wii = 0;
	for(int i = 0;i < N;i++){
		if(i == wi) continue;
		d[i] = getDistance(wi, i);
		if(d[i] > md){
			md = d[i];
			wii = i;
		}
	}
	dw[wii] = 0;
	dw[wi] = md;
	for(int i = 0;i < N;i++) if(i != wi && i != wii) dw[i] = getDistance(wii, i);
	for(int i = 0;i < N;i++){
		if(i == wi || i == wii) continue;
		int dlca = (d[i]+dw[i]-d[wii])/2;
		md = min(md, max(d[i]-dlca, dw[i]-dlca));
	}
	int C[2][2];
	for(int i = 0;i < N;i++){
		if(i == wi){
			C[0][0]++;
			continue;
		}
		if(i == wii){
			C[1][0]++;
			continue;
		}
		int dlca = (d[i]+dw[i]-d[wii])/2;
		dlca = max(d[i]-dlca, dw[i]-dlca);
		C[d[i] < dw[i]][dlca==md]++;
	}
	N/=2;
	if(!C[0][1]) goto st;
	if(C[0][1]-1 <= N && C[0][0] <= N && C[1][0]+C[1][1] <= N) return md;
	st:
	if(!C[1][1]) return -md;
	if(C[1][1]-1 <= N && C[1][0] <= N && C[0][0]+C[0][1] <= N) return md;
	return -md;
}

Compilation message (stderr)

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:4:28: warning: unused parameter 'sub' [-Wunused-parameter]
    4 | int hubDistance(int N, int sub) {
      |                        ~~~~^~~

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