Submission #127368

#	Time	Username	Problem	Language	Result	Execution time	Memory
127368		kingfran1907	Towns (IOI15_towns)	C++14	25 / 100	69 ms	4984 KiB

towns

#include "towns.h"
#include <bits/stdc++.h>

using namespace std;
const int maxn = 120;
const int maxm = 1e6+10;
const int inf = 0x3f3f3f3f;

int qs[maxn][maxn];
int sol[maxm];
vector<int> onh;

int query(int a, int b) {
	if (a > b) swap(a, b);
	if (qs[a][b] == -1) qs[a][b] = getDistance(a, b);
	return qs[a][b];
}

int a, b;
int B;
bool subtree(int x, int y) {
	//int xd = (query(a, x) + query())
}

int hubDistance(int n, int sub) {
	memset(qs, -1, sizeof qs);
	memset(sol, inf, sizeof sol);

	for (int i = 0; i < n; i++)
		qs[i][i] = 0;

	a = 0, b = 0;
	for (int i = 0; i < n; i++)
		if (query(0, a) < query(0, i)) a = i;

	for (int i = 0; i < n; i++)
		if (query(a, b) < query(a, i)) b = i;
	
	B = b; b = 0;
	for (int i = 0; i < n; i++) {
		int cd = (query(a, i) + query(b, i) - query(a, b)) / 2;
		int ad = query(a, i) - cd;
		int bd = query(a, B) - ad;

		sol[ad] = max({cd, ad, bd});
	}

	int hu = 0;
	for (int i = 0; i < maxm; i++) 
		if (sol[hu] > sol[i]) hu = i;

	int lef = 0, rig = 0;
	for (int i = 0; i < n; i++) {
		int cd = (query(a, i) + query(b, i) - query(a, b)) / 2;
		int ad = query(a, i) - cd;
		int bd = query(a, b) - ad;

		if (ad == hu) onh.push_back(i);
		else if (ad < hu) lef++;
		else rig++;
	}
	return sol[hu];
}

Compilation message (stderr)

towns.cpp: In function 'bool subtree(int, int)':
towns.cpp:23:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
towns.cpp:21:18: warning: unused parameter 'x' [-Wunused-parameter]
 bool subtree(int x, int y) {
                  ^
towns.cpp:21:25: warning: unused parameter 'y' [-Wunused-parameter]
 bool subtree(int x, int y) {
                         ^
towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:56:7: warning: unused variable 'bd' [-Wunused-variable]
   int bd = query(a, b) - ad;
       ^~
towns.cpp:25:28: warning: unused parameter 'sub' [-Wunused-parameter]
 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