Submission #951385

#	Time	Username	Problem	Language	Result	Execution time	Memory
951385		pragmatist	Dango Maker (JOI18_dango_maker)	C++17	0 / 100	1 ms	348 KiB

dango_maker

#include<bits/stdc++.h>

using namespace std;

const int N = (int)3e3+7;
const long long INF = (long long)1e18+7;

int n, m, mt[200], T;
char a[N][N];
int used[200];

vector<int> g[200];

int get(int i, int j) {
	return (i-1)*m+j;
}

bool dfs(int v) {
	if(used[v] == T) {
		return 0;
	}
	used[v] = T;
	for(auto to : g[v]) {
		if(mt[to] == -1) {
			mt[to] = v;
			return 1;
		}
	}
	for(auto to : g[v]) {
		if(dfs(mt[to])) {
			return 1;
		}
	}
	return 0;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
	cin >> n >> m;
	for(int i = 1; i <= n; ++i) {
		for(int j = 1; j <= m; ++j) {
			cin >> a[i][j];
			mt[get(i, j)]=-1;
		}
	}
	for(int i = 1; i <= n; ++i) {
		for(int j = 1; j <= m; ++j) {
			if(j+2<=m) {
				if(a[i][j] == 'R' && a[i][j+1] == 'G' && a[i][j+2] == 'W') {
					g[get(i, j)].push_back(get(i, j+2));
			//		g[get(i, j+2)].push_back(get(i, j));
				}
			}
			if(i+2<=n) {
				if(a[i][j] == 'R' && a[i+1][j] == 'G' && a[i+2][j] == 'W') {
					g[get(i, j)].push_back(get(i+2, j));
			//		g[get(i+2, j)].push_back(get(i, j));
				}
			}
		}
	}
	int ans = 0;
	for(int i = 1; i <= n; ++i) {
		for(int j = 1; j <= m; ++j) {
	        T++;
			if(dfs(get(i, j))) {
				ans++;
			}
		}
	}
	cout << ans/2;
    return 0;
}                   

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