Submission #1143966

#	Time	Username	Problem	Language	Result	Execution time	Memory
1143966		SmuggingSpun	Dango Maker (JOI18_dango_maker)	C++20	13 / 100	0 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 sub23{
	void solve(){
		
	}
}
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{
		sub23::solve();
	}
}

Compilation message (stderr)

dango_maker.cpp: In function 'int main()':
dango_maker.cpp:67:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |                 freopen(taskname".inp", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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