제출 #321700

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
321700		Kevin_Zhang_TW	The Kingdom of JOIOI (JOI17_joioi)	C++17	0 / 100	1 ms	364 KiB

joioi

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define pb emplace_back
#define AI(i) begin(i), end(i)
#ifdef KEV
#define DE(args...) kout("[ " + string(#args) + " ] = ", args)
void kout() { cerr << endl; }
template <class T, class ...U> 
void kout(T a, U ...b) { cerr << a << ' ', kout(b...); }
template <class T>
void debug(T l, T r) { while (l != r) cerr << *l << " \n"[next(l) == r], ++l; }
#else
#define DE(...) 0
#define debug(...) 0
#endif

template <class T>
bool chmin(T &a, T b) { return b < a ? (a = b, true) : false; }
template <class T>
bool chmax(T &a, T b) { return a < b ? (a = b, true) : false; }

const int MAX_N = 2010, inf = 1e9;
int n, m, a[MAX_N][MAX_N], res = inf;
struct bit {
	vector<vector<int>> v;
	int n, m;
	bit(int _n, int _m) :
		n(_n), m(_m) {
			v.resize(n+1, vector<int>(m+1)); 
		}

	void add(int x, int y) {
		for (int i = x;i <= n;i += i&-i)
		   for (int j = y;j <= m;j += j&-j)
			   ++v[i][j];
	}
	int qry(int x, int y) {
		int res = 0;
		for (int i = x;i;i ^= i&-i)
			for (int j = y;j;j ^= j&-j)
				res += v[i][j];
		return res;
	}
};
		   		   
void update() {
	bit tree(n, m);
	
	vector<pair<int,int>> id;
	for (int i = 1;i <= n;++i)
		for (int j = 1;j <= m;++j)
			id.pb(i, j);

	auto get = [&](pair<int,int> p) {
		return a[p.first][p.second];
	};

	sort(AI(id), [&](auto x, auto y) {
			return get(x) < get(y);
			});

	auto valid = [&](pair<int,int> p) {
		return tree.qry(p.first, p.second) == p.first * p.second;
	};

	for (int i = 0, j = 0;i < id.size();++i) {
		tree.add(id[i].first, id[i].second);

		while (j <= i && valid(id[j]))
			++j;
		//DE(get(id[i]), get(id[0]));

		if (valid(id[0]) && valid(id[i]) && j < id.size())
			chmin(res, max(get(id[i]) - get(id[0]), get(id.back()) - get(id[j])));
	}
	chmin(res, get(id.back()) - get(id.front()));
}
int32_t main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	cin >> n >> m;
	for (int i = 1;i <= n;++i)
		for (int j = 1;j <= m;++j)
			cin >> a[i][j];
	update();

	for (int l = 1, r = n;l < r;++l, --r)
		swap(a[l], a[r]);

	update();

	swap(n, m);

	for (int i = 1;i <= n;++i)
		for (int j = i+1;j <= m;++j)
			swap(a[i][j], a[j][i]);

	update();
	for (int l = 1, r = n;l < r;++l, --r)
		swap(a[l], a[r]);
	update();

	cout << res << '\n';
}

컴파일 시 표준 에러 (stderr) 메시지

joioi.cpp: In function 'void update()':
joioi.cpp:67:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |  for (int i = 0, j = 0;i < id.size();++i) {
      |                        ~~^~~~~~~~~~~
joioi.cpp:74:41: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   74 |   if (valid(id[0]) && valid(id[i]) && j < id.size())
      |                                       ~~^~~~~~~~~~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 45
• Subtask 3: 0 / 40