Submission #707080

#	Time	Username	Problem	Language	Result	Execution time	Memory
707080		marvinthang	Towns (IOI15_towns)	C++17	48 / 100	18 ms	400 KiB

towns

/*************************************
*    author: marvinthang             *
*    created: 08.03.2023 17:37:48    *
*************************************/

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

using namespace std;

#define                  fi  first
#define                  se  second
#define                left  ___left
#define               right  ___right
#define                TIME  (1.0 * clock() / CLOCKS_PER_SEC)
#define             MASK(i)  (1LL << (i))
#define           BIT(x, i)  ((x) >> (i) & 1)
#define  __builtin_popcount  __builtin_popcountll
#define              ALL(v)  (v).begin(), (v).end()
#define           REP(i, n)  for (int i = 0, _n = (n); i < _n; ++i)
#define          REPD(i, n)  for (int i = (n); i--; )
#define        FOR(i, a, b)  for (int i = (a), _b = (b); i < _b; ++i) 
#define       FORD(i, b, a)  for (int i = (b), _a = (a); --i >= _a; ) 
#define       FORE(i, a, b)  for (int i = (a), _b = (b); i <= _b; ++i) 
#define      FORDE(i, b, a)  for (int i = (b), _a = (a); i >= _a; --i) 
#define        scan_op(...)  istream & operator >> (istream &in, __VA_ARGS__ &u)
#define       print_op(...)  ostream & operator << (ostream &out, const __VA_ARGS__ &u)
#ifdef LOCAL
    #include "debug.h"
#else
    #define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
    #define DB(...) 23
    #define db(...) 23
    #define debug(...) 23
#endif

template <class T> scan_op(vector <T>)  { for (size_t i = 0; i < u.size(); ++i) in >> u[i]; return in; }
template <class U, class V> scan_op(pair <U, V>)  { return in >> u.fi >> u.se; }
template <class U, class V> print_op(pair <U, V>)  { return out << '(' << u.first << ", " << u.second << ')'; }
template <class Con, class = decltype(begin(declval<Con>()))> typename enable_if <!is_same<Con, string>::value, ostream&>::type operator << (ostream &out, const Con &con) { out << '{'; for (__typeof(con.begin()) it = con.begin(); it != con.end(); ++it) out << (it == con.begin() ? "" : ", ") << *it; return out << '}'; }
template <size_t i, class T> ostream & print_tuple_utils(ostream &out, const T &tup) { if constexpr(i == tuple_size<T>::value) return out << ")";  else return print_tuple_utils<i + 1, T>(out << (i ? ", " : "(") << get<i>(tup), tup); }
template <class ...U> print_op(tuple<U...>) { return print_tuple_utils<0, tuple<U...>>(out, u); }
template <class A, class B> bool minimize(A &a, B b)  { if (a > b) { a = b; return true; } return false; }
template <class A, class B> bool maximize(A &a, B b)  { if (a < b) { a = b; return true; } return false; }

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count()); 
long long rand(long long l, long long h) { return uniform_int_distribution <long long> (l, h) (rng); } 

// end of template

int hubDistance(int N, int sub) {
	if (sub == 3) {
		vector <vector <int>> dist(N, vector<int>(N, 0));
		REP(i, N) REP(j, i) dist[i][j] = dist[j][i] = getDistance(i, j);
		int u = 0, v = 0, diameter = 0;
		REP(love, 2) {
			pair <int, int> f;
			REP(i, N) if (i != u) maximize(f, make_pair(dist[i][u], i));
			v = u; u = f.se; diameter = f.fi;
		}
		int res = diameter;
		map <int, vector <int>> List;
		REP(w, N) if (w != u && w != v) {
			int v_to_city = (diameter + dist[v][w] - dist[u][w]) / 2;
			List[v_to_city].push_back(w);
			minimize(res, max(v_to_city, diameter - v_to_city));
		}
		int left = 1;
		for (auto [d, l]: List) {
			if (max(d, diameter - d) == res) {
				vector <int> comps;
				int right = N - left - (int) l.size();
				if (left > N / 2 || right > N / 2) continue;
				vector <bool> used(l.size());
				bool ok = true;
				REP(i, l.size()) if (!used[i]) {
					int cnt = 0;
					REP(j, l.size()) if (!used[j]) {
						if (dist[v][l[i]] + dist[v][l[j]] - 2 * d != dist[l[i]][l[j]]) {
							used[j] = true;
							++cnt;
						}
					}
					if (cnt > N / 2) {
						ok = false;
						break;
					}
				}
				if (ok) return res;
			}
			left += l.size();
		}
		return -res;
	}
	int u = 0, v = 0, diameter = 0;
	vector <int> dist(N);
	REP(love, 2) {
		pair <int, int> f;
		REP(i, N) if (i != u) {
			dist[i] = getDistance(u, i);
			maximize(f, make_pair(dist[i], i));
		}
		v = u; u = f.se; diameter = f.fi;
	}
	int res = diameter;
	map <int, vector <int>> List;
	REP(w, N) if (w != u && w != v) {
		int v_to_city = (diameter + dist[w] - getDistance(u, w)) / 2;
		List[v_to_city].push_back(w);
		minimize(res, max(v_to_city, diameter - v_to_city));
	}
	if (sub < 3) return res;
	int left = 1;
	vector <bool> used(N);
	for (auto [d, l]: List) {
		if (max(d, diameter - d) == res) {
			int right = N - left - (int) l.size();
			if (left > N / 2 || right > N / 2) continue;
			if (sub == 4) {
				if (l.size() > N / 2) continue;
				return res;
			}
			if (l.size() <= N / 2) return res;
			bool ok = true;
			REP(_, 1) {
				while (used[l[0]]) shuffle(ALL(l), rng);
				used[l[0]] = true;
				int cnt = 1;
				FOR(i, 1, l.size()) if (!used[l[i]] && dist[l[0]] + dist[l[i]] - 2 * d != getDistance(l[0], l[i])) {
					used[l[i]] = true;
					++cnt;
				}
				if (cnt > N / 2) {
					ok = false;
					break;
				}
			}
			if (ok) return res;
		}
		left += l.size();
	}
	return -res;
}

#ifdef LOCAL
#include "graderlib.c"

int main() {
    FILE *f;
    f = freopen("towns.in","r",stdin);
    assert(f != NULL);
    f = freopen("towns.out","w",stdout);
    assert(f != NULL);
    int ncase, R, N;
    int subtask;
    int ret;
    ret = scanf("%d%d",&subtask,&ncase);
    assert(ret == 2);
    for (int i = 0; i < ncase; i++) {
        ret = scanf("%d",&N);
	assert(ret == 1);
        _ini_query(N,subtask);
        R=hubDistance(N,subtask);
        printf("%d\n",R);
    }
    return 0;
}
#endif

Compilation message (stderr)

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:20:46: warning: declaration of '_n' shadows a previous local [-Wshadow]
   20 | #define           REP(i, n)  for (int i = 0, _n = (n); i < _n; ++i)
      |                                              ^~
towns.cpp:54:13: note: in expansion of macro 'REP'
   54 |   REP(i, N) REP(j, i) dist[i][j] = dist[j][i] = getDistance(i, j);
      |             ^~~
towns.cpp:20:46: note: shadowed declaration is here
   20 | #define           REP(i, n)  for (int i = 0, _n = (n); i < _n; ++i)
      |                                              ^~
towns.cpp:54:3: note: in expansion of macro 'REP'
   54 |   REP(i, N) REP(j, i) dist[i][j] = dist[j][i] = getDistance(i, j);
      |   ^~~
towns.cpp:20:46: warning: declaration of '_n' shadows a previous local [-Wshadow]
   20 | #define           REP(i, n)  for (int i = 0, _n = (n); i < _n; ++i)
      |                                              ^~
towns.cpp:58:4: note: in expansion of macro 'REP'
   58 |    REP(i, N) if (i != u) maximize(f, make_pair(dist[i][u], i));
      |    ^~~
towns.cpp:20:46: note: shadowed declaration is here
   20 | #define           REP(i, n)  for (int i = 0, _n = (n); i < _n; ++i)
      |                                              ^~
towns.cpp:56:3: note: in expansion of macro 'REP'
   56 |   REP(love, 2) {
      |   ^~~
towns.cpp:76:18: warning: conversion from 'std::vector<int>::size_type' {aka 'long unsigned int'} to 'int' may change value [-Wconversion]
   20 | #define           REP(i, n)  for (int i = 0, _n = (n); i < _n; ++i)
      |                                                   ~~~
......
   76 |     REP(i, l.size()) if (!used[i]) {
towns.cpp:20:52: note: in definition of macro 'REP'
   20 | #define           REP(i, n)  for (int i = 0, _n = (n); i < _n; ++i)
      |                                                    ^
towns.cpp:20:46: warning: declaration of '_n' shadows a previous local [-Wshadow]
   20 | #define           REP(i, n)  for (int i = 0, _n = (n); i < _n; ++i)
      |                                              ^~
towns.cpp:78:6: note: in expansion of macro 'REP'
   78 |      REP(j, l.size()) if (!used[j]) {
      |      ^~~
towns.cpp:20:46: note: shadowed declaration is here
   20 | #define           REP(i, n)  for (int i = 0, _n = (n); i < _n; ++i)
      |                                              ^~
towns.cpp:76:5: note: in expansion of macro 'REP'
   76 |     REP(i, l.size()) if (!used[i]) {
      |     ^~~
towns.cpp:78:19: warning: conversion from 'std::vector<int>::size_type' {aka 'long unsigned int'} to 'int' may change value [-Wconversion]
   20 | #define           REP(i, n)  for (int i = 0, _n = (n); i < _n; ++i)
      |                                                   ~~~
......
   78 |      REP(j, l.size()) if (!used[j]) {
towns.cpp:20:52: note: in definition of macro 'REP'
   20 | #define           REP(i, n)  for (int i = 0, _n = (n); i < _n; ++i)
      |                                                    ^
towns.cpp:91:19: warning: conversion from 'std::vector<int>::size_type' {aka 'long unsigned int'} to 'int' may change value [-Wconversion]
   91 |    left += l.size();
      |                   ^
towns.cpp:20:46: warning: declaration of '_n' shadows a previous local [-Wshadow]
   20 | #define           REP(i, n)  for (int i = 0, _n = (n); i < _n; ++i)
      |                                              ^~
towns.cpp:99:3: note: in expansion of macro 'REP'
   99 |   REP(i, N) if (i != u) {
      |   ^~~
towns.cpp:20:46: note: shadowed declaration is here
   20 | #define           REP(i, n)  for (int i = 0, _n = (n); i < _n; ++i)
      |                                              ^~
towns.cpp:97:2: note: in expansion of macro 'REP'
   97 |  REP(love, 2) {
      |  ^~~
towns.cpp:120:18: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  120 |     if (l.size() > N / 2) continue;
      |         ~~~~~~~~~^~~~~~~
towns.cpp:123:17: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  123 |    if (l.size() <= N / 2) return res;
      |        ~~~~~~~~~^~~~~~~~
towns.cpp:129:21: warning: conversion from 'std::vector<int>::size_type' {aka 'long unsigned int'} to 'int' may change value [-Wconversion]
   22 | #define        FOR(i, a, b)  for (int i = (a), _b = (b); i < _b; ++i)
      |                                                     ~~~
......
  129 |     FOR(i, 1, l.size()) if (!used[l[i]] && dist[l[0]] + dist[l[i]] - 2 * d != getDistance(l[0], l[i])) {
towns.cpp:22:54: note: in definition of macro 'FOR'
   22 | #define        FOR(i, a, b)  for (int i = (a), _b = (b); i < _b; ++i)
      |                                                      ^
towns.cpp:140:18: warning: conversion from 'std::vector<int>::size_type' {aka 'long unsigned int'} to 'int' may change value [-Wconversion]
  140 |   left += l.size();
      |                  ^

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