Submission #1047754

#	Time	Username	Problem	Language	Result	Execution time	Memory
1047754		efedmrlr	Rectangles (IOI19_rect)	C++17	13 / 100	328 ms	361120 KiB

rect

#include "rect.h"
// #pragma GCC optimize("O3,Ofast,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#include <bits/stdc++.h>

using namespace std;


#define lli long long int
#define MP make_pair
#define pb push_back
#define REP(i,n) for(int i = 0; (i) < (n); (i)++)
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()


void fastio() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
}


const double EPS = 0.00001;
const int INF = 1e9+500;
const int ALPH = 26;
const int LGN = 25;
constexpr int MOD = 1e9+7;
int n, m;
vector<vector<int> > gr, vis;
vector<array<int, 2> > dir(4);
int x11, x22, y11, y22, cnt;
void dfs(int x, int y) {
	if(vis[x][y] || gr[x][y]) return;
	// cout << "x : " << x << " y:" << y << "\n";
	cnt++;
	vis[x][y] = 1;
	x11 = min(x11, x);
	x22 = max(x22, x);
	y11 = min(y11, y);
	y22 = max(y22, y);
	for(auto c : dir) {
		int xn = x + c[0], yn = y + c[1];
		if(xn >= n || yn >= m) continue;
		if(xn < 0 || yn < 0) continue;
		dfs(xn, yn);
	}
}

long long count_rectangles(std::vector<std::vector<int> > a) {
	dir.resize(4);
	dir[0] = {0, 1};
	dir[1] = {0, -1};
	dir[2] = {1, 0};
	dir[3] = {-1, 0};
	n = (int)a.size();
	m = (int)a[0].size();
	gr.assign(n, vector<int>(m, 0));
	REP(i, n) REP(j, m) gr[i][j] = a[i][j];
	vis.assign(n, vector<int>(m, 0));
	lli ans = 0;
	for(int i = 0; i < n; i++) {
		for(int j = 0; j < m; j++) {
			// cout << "i:" << i << " j:" << j << "\n";
			if(vis[i][j] || gr[i][j]) continue;
			x11 = i; x22 = i; y11 = j; y22 = j;
			cnt = 0;
			dfs(i, j);
			if(cnt == 0) continue;
			// cout << "x1:" << x11 << " x2:" << x22 << " y1:" << y11 << " y2:" << y22 << "\n";
			if(x11 == 0 || y11 == 0 || x22 == n - 1 || y22 == m - 1) continue;
			if((x22 - x11 + 1) * (y22 - y11 + 1) != cnt) continue;
			ans++;
		}
	}

	return ans;
}

// int main() {
// 	int n, m;
// 	cin >> n >> m;
// 	vector<vector<int> > grid(n,vector<int>(m));
// 	REP(i, n) REP(j, m) {
// 		cin >> grid[i][j];
// 	}
// 	cout << count_rectangles(grid) << "\n";
// 	return 0;
// }

• Subtask 1: 0 / 8
• Subtask 2: 0 / 7
• Subtask 3: 0 / 12
• Subtask 4: 0 / 22
• Subtask 5: 0 / 10
• Subtask 6: 13 / 13
• Subtask 7: 0 / 28