Submission #1144023

#	Time	Username	Problem	Language	Result	Execution time	Memory
1144023		SmuggingSpun	Dango Maker (JOI18_dango_maker)	C++20	33 / 100	1 ms	584 KiB

dango_maker

#include<bits/stdc++.h>
#define taskname "C"
using namespace std;
template<class T>void maximize(T& a, T b){
	if(a < b){
		a = b;
	}
}
int n, m;
namespace sub1{
	void solve(){
		vector<int>dp(1 << (n * m), -1);
		vector<vector<char>>a(n, vector<char>(m));
		for(int i = 0; i < n; i++){
			for(int j = 0; j < m; j++){
				cin >> a[i][j];
			}
		}
		auto solve = [&] (auto&& self, vector<vector<bool>>state) -> int{
			int mask = 0;
			for(int i = 0, p = 0; i < n; i++){
				for(int j = 0; j < m; j++, p++){
					if(state[i][j]){
						mask |= 1 << p;
					}
				}
			}				
			int& ans = dp[mask];
			if(ans != -1){
				return ans;
			}
			for(int i = ans = 0; i < n; i++){
				for(int j = 0; j + 2 < m; j++){
					if(state[i][j] && state[i][j + 1] && state[i][j + 2]){
						if(a[i][j] == 'R' && a[i][j + 1] == 'G' && a[i][j + 2] == 'W'){
							state[i][j] = state[i][j + 1] = state[i][j + 2] = false;
							maximize(ans, self(self, state) + 1);
							state[i][j] = state[i][j + 1] = state[i][j + 2] = true;
						}
					}
				}
			}
			for(int i = 0; i + 2 < n; i++){
				for(int j = 0; j < m; j++){
					if(state[i][j] && state[i + 1][j] && state[i + 2][j]){
						if(a[i][j] == 'R' && a[i + 1][j] == 'G' && a[i + 2][j] == 'W'){
							state[i][j] = state[i + 1][j] = state[i + 2][j] = false;
							maximize(ans, self(self, state) + 1);
							state[i][j] = state[i + 1][j] = state[i + 2][j] = true;
						}
					}
				}
			}
			return ans;
		};
		cout << solve(solve, vector<vector<bool>>(n, vector<bool>(m, true)));
	}
}
namespace sub2{
	void solve(){
		vector<vector<char>>a(n + 1, vector<char>(m + 1));
		for(int i = 1; i <= n; i++){
			for(int j = 1; j <= m; j++){
				cin >> a[i][j];
			}
		}
		vector<vector<int>>g, row(n + 1, vector<int>(m + 1, -1));
		for(int i = 1, id = 0; i <= n; i++){
			for(int j = 1; j + 1 < m; j++){
				if(a[i][j] == 'R' && a[i][j + 1] == 'G' && a[i][j + 2] == 'W'){
					row[i][j] = g.size();
					g.emplace_back(vector<int>());
				}
			}
		}
		int id = 0;
		for(int i = 1; i + 1 < n; i++){
			for(int j = 1; j <= m; j++){
				if(a[i][j] == 'R' && a[i + 1][j] == 'G' && a[i + 2][j] == 'W'){
					if(row[i][j] != -1){
						g[row[i][j]].emplace_back(id);
					}
					if(row[i + 1][j - 1] != -1){
						g[row[i + 1][j - 1]].emplace_back(id);
					}
					if(j > 2 && row[i + 2][j - 2] != -1){
						g[row[i + 2][j - 2]].emplace_back(id);
					}
					id++;
				}
			}
		}
		vector<int>match(id, -1), f(g.size(), -1);
		vector<bool>in(g.size(), false);
		int cnt_iter = 0;
		auto kuhn = [&] (auto&& self, int u) -> bool{
			if(f[u] == cnt_iter){
				return false;
			}
			f[u] = cnt_iter;
			for(int& v : g[u]){
				if(match[v] == -1 || self(self, match[v])){
					match[v] = u;
					return true;
				}
			}
			return false;
		};
		for(bool run = true; run; cnt_iter++){
			run = false;
			for(int i = 0; i < g.size(); i++){
				if(!in[i] && kuhn(kuhn, i)){
					in[i] = run = true;
					id--;
				}
			}
		}
		cout << int(g.size()) + id;
	}
}
namespace sub3{
	void solve(){
		vector<vector<char>>a(n + 2, vector<char>(m + 2, '#'));
		for(int i = 1; i <= n; i++){
			for(int j = 1; j <= m; j++){
				cin >> a[i][j];
			}
		}
		int ans = 0;
		auto check = [&] (int x, int y, int d){
			return a[x][y] == 'G' && (d == 1 ? (a[x][y - 1] == 'R' && a[x][y + 1] == 'W') : (a[x - 1][y] == 'R' && a[x + 1][y] == 'W'));
		};
		auto work = [&] (int _i, int _j){
			vector<pair<int, int>>p;
			while(_i <= n && _j <= m){
				p.emplace_back(_i++, _j++);
			}	
			vector<int>dp(3, 0);
			for(auto& [x, y] : p){
				vector<int>new_dp(3);
				new_dp[0] = max(max(dp[0], dp[1]), dp[2]);
				if(check(x, y, 1)){
					new_dp[1] = max(dp[0], dp[1]) + 1;
				}
				if(check(x, y, 2)){
					new_dp[2] = max(dp[0], dp[2]) + 1;
				}
				swap(dp, new_dp);
			}
			ans += max(max(dp[0], dp[1]), dp[2]);
		};
 		for(int j = 1; j <= m; j++){
			work(1, j);
		}
		for(int i = 2; i <= n; i++){
			work(i, 1);
		}
		cout << ans;
	}
}
int main(){
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	if(fopen(taskname".inp", "r")){
		freopen(taskname".inp", "r", stdin);
	}
	cin >> n >> m;
	if(n <= 4 && m <= 4){
		sub1::solve();
	}
	else if(n <= 10 && m <= 10){
		sub2::solve();
	}
	else{
		sub3::solve();
	}
}

Compilation message (stderr)

dango_maker.cpp: In function 'int main()':
dango_maker.cpp:164:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  164 |                 freopen(taskname".inp", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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