Submission #623930

#	Time	Username	Problem	Language	Result	Execution time	Memory
623930		8e7	Towns (IOI15_towns)	C++17	25 / 100	15 ms	1184 KiB

towns

//Challenge: Accepted
#include <bits/stdc++.h>
using namespace std;
#ifdef zisk
void debug(){cout << endl;}
template<class T, class ... U> void debug(T a, U ...b){cout << a << " ", debug(b...);}
template<class T> void pary(T l, T r) {
	while (l != r) cout << *l << " ", l++;
	cout << endl;
}
#else
#define debug(...) 0
#define pary(...) 0
#endif
#define ll long long
#define maxn 155
#define pii pair<int, int>
#define ff first
#define ss second
#include "towns.h"


int n;
int save[maxn][maxn];
bool done[maxn][maxn];
int query(int u, int v) {
	if (u == v || u >= n || v >= n) return 0;
	if (done[u][v]) return save[u][v];
	save[u][v] = save[v][u] = getDistance(u, v);
	done[u][v] = done[v][u] = 1;
	return save[u][v];
}
int hubDistance(int N, int sub) {
	n = N;
	for (int i = 0;i < n;i++) {
		for (int j = 0;j < n;j++) done[i][j] = 0;
	}
	vector<int> da, db, l(n), w(n), ws;
	int b = 0, ma = 0;
	for (int i = 0;i < n;i++) {
		da.push_back(query(0, i));	
		if (da.back() > ma) {
			ma = da.back();
			b = i;
		}
	}
	int len = ma;
	for (int i = 0;i < n;i++) {
		db.push_back(query(b, i));
		ma = max(ma, db.back());
	}
	//debug(ma);
	
	int R = 1<<30;
	for (int i = 0;i < n;i++) {
		l[i] = (da[i] + db[i] - len) / 2;	
		w[i] = db[i] - l[i];
		//debug(l[i], w[i]);
		ws.push_back(w[i]);
		R = min(R, max(w[i], ma - w[i]));
	}
	return R;
	/*
	sort(ws.begin(), ws.end());
	ws.resize(int(unique(ws.begin(), ws.end()) - ws.begin()));
	int siz = ws.size();
	vector<vector<int> > col(siz, vector<int>());
	vector<int> pref(siz, 0), suf(siz, 0);
	for (int i = 0;i < n;i++) {
		int ind = lower_bound(ws.begin(), ws.end(), w[i]) - ws.begin();	
		col[ind].push_back(i);
	}
	for (int i = 0;i < siz;i++) pref[i] = col[i].size() + (i ? pref[i-1] : 0);	
	for (int i = siz-1;i >= 0;i--) suf[i] = col[i].size() + (i < siz-1 ? suf[i+1] : 0);
	for (int i = 0;i < siz;i++) {
		int v = max(w[i], ma - w[i]);
		if (v == R) {

		}
	}
	
	return R;
	*/
}

Compilation message (stderr)

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:33:28: warning: unused parameter 'sub' [-Wunused-parameter]
   33 | 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