Submission #99427

#	Time	Username	Problem	Language	Result	Execution time	Memory
99427		psmao	Dango Maker (JOI18_dango_maker)	C++14	0 / 100	229 ms	212504 KiB

dango_maker

#include <bits/stdc++.h>
using namespace std;

#define fo(i,s,t) for(int i = s; i <= t; ++ i)
#define fd(i,s,t) for(int i = s; i >= t; -- i)
#define bf(i,s) for(int i = head[s]; i; i = e[i].next)
#define mp make_pair
#define fi first
#define se second
#define pii pair<int,int>
#define pb push_back
#define VI vector<int>
#define sf scanf
#define pf printf
#define fp freopen
#define SZ(x) ((int)(x).size())
#ifdef MPS
#define D(x...) printf(x)
#else
#define D(x...)
#endif
typedef long long ll;
typedef double db;
typedef unsigned long long ull;
const int inf = 1<<30;
const ll INF = 1ll<<60;
const db Inf = 1e20;
const db eps = 1e-9;

void gmax(int &a,int b){a = (a > b ? a : b);}
void gmin(int &a,int b){a = (a < b ? a : b);}

const int maxn = 3005;

int n, m, p[maxn][maxn];
int b[maxn*maxn];
char a[maxn][maxn];
int T, vis[maxn*maxn];
VI adj[maxn*maxn];

void link(int u, int v)
{
	adj[u].pb(v);
	adj[v].pb(u);
}
int dfs(int u)
{
	for(auto p : adj[u]) if(vis[p] != T)
	{
		vis[p] = T;
		if(!b[p] || dfs(p)) 
		{
			b[p] = u;
			return 1;
		}
	}
	return 0;
}
int main()
{
	#ifdef MPS
		fp("1.in","r",stdin);
		fp("1.out","w",stdout);
	#endif
	sf("%d%d",&n,&m);
	fo(i,1,n) sf("%s",a[i]+1);
	int tot = 0;
	fo(i,1,n) fo(j,1,m) p[i][j] = ++ tot;
	fo(i,1,n) fo(j,1,m) if(a[i][j] == 'R')
	{
		if(j+2 <= m && a[i][j+1] == 'G' && a[i][j+2] == 'W')
			link(p[i][j], p[i][j+2]);
		if(j-2 >= 1 && a[i][j-1] == 'G' && a[i][j-2] == 'W')
			link(p[i][j], p[i][j-2]);
		if(i+2 <= n && a[i+1][j] == 'G' && a[i+2][j] == 'W')
			link(p[i][j], p[i+2][j]);
		if(i-2 >= 1 && a[i-1][j] == 'G' && a[i-2][j] == 'W')
			link(p[i][j], p[i-2][j]);
	}
	int ans = 0;
	fo(i,1,n) fo(j,1,m) if(a[i][j] == 'R')
	{
		++ T;
		ans += dfs(p[i][j]);
	} 
	pf("%d\n",ans);
	return 0;
}

Compilation message (stderr)

dango_maker.cpp: In function 'int main()':
dango_maker.cpp:65:4: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  sf("%d%d",&n,&m);
    ^
dango_maker.cpp:66:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  fo(i,1,n) sf("%s",a[i]+1);
              ^

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