Submission #284252

#	Time	Username	Problem	Language	Result	Execution time	Memory
284252		YJU	Dango Maker (JOI18_dango_maker)	C++14	0 / 100	1 ms	384 KiB

dango_maker

#include<bits/stdc++.h>
#pragma GCC optimize("unroll-loops,no-stack-protector")
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> pll;
const ll MOD=1e9+7;
const ll MOD2=998244353;
const ll N=3e3+5;
const ld pi=3.14159265359;
const ll INF=(1LL<<60);
#define SQ(i) ((i)*(i))
#define REP(i,n) for(ll i=0;i<n;i++)
#define REP1(i,n) for(ll i=1;i<=n;i++)
#define pb push_back
#define mp make_pair
#define X first
#define Y second
#define setp setprecision
#define lwb lower_bound
#define SZ(_a) (ll)_a.size()

map<ll,vector<ll> > v;
map<ll,ll> col;
ll cnt[3],n,m,ans;
vector<ll> point;
char c[N][N];


bool valid(ll xa,ll ya,ll xb,ll yb){
	if(xa>xb)swap(xa,xb);
	if(ya>yb)swap(ya,yb);
	ll xm=(xa+xb)/2,ym=(ya+yb)/2;
	if(xa<0||xb>=n||ya<0||yb>=m||c[xm][ym]!='G')return 0;
	if(ya==yb){
		return ((c[xa][ym]=='R'&&c[xb][ym]=='W')||c[xa][ym]=='W'&&c[xb][ym]=='R');
	}else{
		return ((c[xm][ya]=='R'&&c[xm][yb]=='W')||c[xm][ya]=='W'&&c[xm][yb]=='R');
	}
}

void DFS(ll nd){
	++cnt[col[nd]];
	for(auto i:v[nd]){
		if(col[i]==0){
			col[i]=3-col[nd];
			DFS(i);
		}
	}
}

int main(){
	ios_base::sync_with_stdio(0);cin.tie(0);
	cin>>n>>m;
	REP(i,n)REP(j,m){
		cin>>c[i][j];
	}
	REP(i,n)REP(j,m){
		ll nd=i*m+j;
		if(c[i][j]=='G'){
			if(valid(i-1,j,i+1,j)&&valid(i,j-1,i,j+1)){
				v[nd*2].pb(nd*2+1);
				v[nd*2+1].pb(nd*2);
			}
			if(valid(i-1,j,i+1,j))point.pb(nd*2);
			if(valid(i,j-1,i,j+1))point.pb(nd*2+1);
		}else{
			vector<ll> tmp;
			if(valid(i-2,j,i,j))tmp.pb(2*((i-1)*m+j));
			if(valid(i,j,i+2,j))tmp.pb(2*((i+1)*m+j));
			if(valid(i,j-2,i,j))tmp.pb(2*(i*m+(j-1))+1);
			if(valid(i,j,i,j+2))tmp.pb(2*(i*m+(j+1))+1);
			for(auto ii:tmp)for(auto jj:tmp){
				if(ii==jj)continue;
				v[ii].pb(jj);v[jj].pb(ii);
			}
		}
	}
	for(auto i:point){
		cnt[1]=cnt[2]=0;
		if(col[i]==0){
			col[i]=1;
			DFS(i);
			ans+=max(cnt[1],cnt[2]);
		}
	}
	cout<<ans<<"\n";
	return 0;
}

Compilation message (stderr)

dango_maker.cpp: In function 'bool valid(ll, ll, ll, ll)':
dango_maker.cpp:36:59: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   36 |   return ((c[xa][ym]=='R'&&c[xb][ym]=='W')||c[xa][ym]=='W'&&c[xb][ym]=='R');
      |                                             ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
dango_maker.cpp:38:59: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   38 |   return ((c[xm][ya]=='R'&&c[xm][yb]=='W')||c[xm][ya]=='W'&&c[xm][yb]=='R');
      |                                             ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~

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