Submission #409013

#	Time	Username	Problem	Language	Result	Execution time	Memory
409013		arwaeystoamneg	Dango Maker (JOI18_dango_maker)	C++17	13 / 100	1 ms	384 KiB

dango_maker

// EXPLOSION!
#define _CRT_SECURE_NO_WARNINGS
#include<bits/stdc++.h>
#include<unordered_set>
#include<unordered_map>
#include<chrono>

using namespace std;
typedef pair<int, int> pii;
typedef long long ll;
typedef pair<ll, ll> pll;
typedef long double ld;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<pair<int, int>> vpi;
typedef vector<pair<ll, ll>> vpll;

#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)

#define pb push_back
#define mp make_pair
#define rsz resize
#define sz(x) int(x.size())
#define all(x) x.begin(),x.end()
#define f first
#define s second
#define cont continue
#define endl '\n'
//#define ednl '\n'
#define test int testc;cin>>testc;while(testc--)
#define pr(a, b) trav(x,a)cerr << x << b; cerr << endl;
#define message cout << "Hello World" << endl;
const int dx[4] = { 1,0,-1,0 }, dy[4] = { 0,1,0,-1 }; // for every grid problem!!
const ll linf = 4000000000000000000LL;
const ll inf = 1000000007;//998244353    

void pv(vi a) { trav(x, a)cout << x << " "; cout << endl; }void pv(vll a) { trav(x, a)cout << x << " "; cout << endl; }void pv(vector<vi>a) {
	F0R(i, sz(a)) { cout << i << endl; pv(a[i]); cout << endl; }
}void pv(vector<vll>a) { F0R(i, sz(a)) { cout << i << endl; pv(a[i]); }cout << endl; }void pv(vector<string>a) { trav(x, a)cout << x << endl; cout << endl; }
void setIO(string s) {
	ios_base::sync_with_stdio(0); cin.tie(0);
#ifdef arwaeystoamneg
	if (sz(s))
	{
		freopen((s + ".in").c_str(), "r", stdin);
		if (s != "test1")
			freopen((s + ".out").c_str(), "w", stdout);
	}
#endif
}
const int MAX = 3003, MAX_ = 18000003;
int n, m, a[MAX][MAX];
int adj[MAX_][3], cur[MAX_];
bitset<MAX_>b, v;
bool check(int i, int j, int t)
{
	F0R(k, 3)
	{
		int x = i, y = j;
		if (x >= 0 && y >= 0 && x < n && y < m)
		{
			if (a[x][y] != k)return 0;
		}
		else
		{
			return 0;
		}
		i += dx[t], j += dy[t];
	}
	return 1;
}
int c, d;
void dfs(int i, int t = 1)
{
	v[i] = 1;
	c += t;
	d++;
	F0R(j, cur[i])
	{
		int x = adj[i][j];
		if (v[x])continue;
		dfs(x, t ^ 1);
	}
}
int main()
{
	setIO("test1");
	cin >> n >> m;
	F0R(i, n)
	{
		string t;
		cin >> t;
		F0R(j, m)a[i][j] = (t[j] == 'R' ? 0 : (t[j] == 'G' ? 1 : 2));
	}
	F0R(i, n)
	{
		F0R(j, m)
		{
			b[m * i + j] = check(i, j, 0);
			b[m * n + m * i + j] = check(i, j, 1);
		}
	}
	F0R(i, n)
	{
		F0R(j, m)
		{
			if (a[i][j] == 0)
			{
				if (b[m * n + m * i + j] && b[m * i + j])
				{
					adj[m * n + m * i + j][cur[m * n + m * i + j]++] = (m * i + j);
					adj[m * i + j][cur[m * i + j]++] = (m * n + m * i + j);
				}
			}
			else if (a[i][j] == 1)
			{
				if (i > 0 && j > 0)
				{
					if (b[m * n + m * (i) + (j - 1)] && b[m * (i - 1) + (j)])
					{
						adj[m * n + m * (i) + (j - 1)][cur[m * n + m * (i) + (j - 1)]++] = (m * (i - 1) + (j));
						adj[m * (i - 1) + (j)][cur[m * (i - 1) + (j)]++] = (m * n + m * (i) + (j - 1));
					}
				}
			}
			else
			{
				if (i > 1 && j > 1)
				{
					if (b[m * n + m * (i) + (j - 2)] && b[m * (i - 2) + (j)])
					{
						adj[m * n + m * (i) + (j - 2)][cur[m * n + m * (i) + (j - 2)]++] = (m * (i - 2) + (j));
						adj[m * (i - 2) + (j)][cur[m * (i - 2) + (j)]++] = (m * n + m * (i) + (j - 2));
					}
				}
			}
			// couldve just written a loop ...
		}
	}
	int ans = 0;
	F0R(i, 2 * n * m)
	{
		if (b[i] && !v[i])
		{
			c = 0, d = 0;
			dfs(i);
			if (c < d - c)c = d - c;
			ans += c;
		}
	}
	cout << ans << endl;
}

• Subtask 1: 13 / 13
• Subtask 2: 0 / 20
• Subtask 3: 0 / 67