Language: C++

int main(){
	cin>>N>>K;
	D("N = %d K = %d \n",N,K);
	for (int i = 0; i<N; i++){
		int x,y; string c;
		cin>>x>>y>>c;
		x%=K*2;
		y%=K*2;
		if (c=="W"){
			w[x][y]+=1;
			numWhite++;
		} else{
			b[x][y]+=1;
			numBlack++;
		}
	}
	D("numBlack = %d numWhite = %d\n",numBlack,numWhite);
	int best = 0;

	for (int x = 0; x<2*K; x++) for (int y = 0; y<2*K; y++){
		dpw[x][y]=w[x][y]+(x==0?0:dpw[x-1][y])+(y==0?0:dpw[x][y-1])-((y==0||x==0)?0:dpw[x-1][y-1]);
		dpb[x][y]=b[x][y]+(x==0?0:dpb[x-1][y])+(y==0?0:dpb[x][y-1])-((y==0||x==0)?0:dpb[x-1][y-1]);
	}
	for (int x1 = 0; x1<K; x1++) for (int y1 = 0; y1<K; y1++){
		D("x1 = %d y1 = %d\n",x1,y1);
		//Ans = NumWhiteCovered + NumBlacKCovered
		int x0 = 0, y0 = 0;
		int x2 = x1+K,y2=y1+K;
		int x3 = 2*K,y3=2*K;
		vector<rect> whiteRectangles;

		int ans = numBlack;
		whiteRectangles.PB(rect(ii(x1,y1),ii(x2,y2)));
		whiteRectangles.PB(rect(ii(x0,y0),ii(x1,y1)));
		whiteRectangles.PB(rect(ii(x2,y2),ii(x3,y3)));
		whiteRectangles.PB(rect(ii(x0,y2),ii(x1,y3)));
		whiteRectangles.PB(rect(ii(x2,y0),ii(x3,y1)));

		for (rect r: whiteRectangles){
			ans+=queryRect(dpw,r);
			ans-=queryRect(dpb,r);
		}
		D(" ans = %d\n",ans);
		best = max(best,max(ans,N-ans));
	}	
	cout<<best<<"\n";
	vector<ii> toOup;
	toOup.PB(ii(0,1)); toOup.PB(ii(0,0));
	toOup.PB(ii(1,0)); toOup.PB(ii(1,2));
	
	for (ii x: toOup){
		D("dpb[%d][%d] = %d\n",x.F,x.S,dpb[x.F][x.S]);
	}
}


Compiler output:
a.cc: In function 'int main()':
a.cc:2:9: error: 'cin' was not declared in this scope
    2 |         cin>>N>>K;
      |         ^~~
a.cc:2:14: error: 'N' was not declared in this scope
    2 |         cin>>N>>K;
      |              ^
a.cc:2:17: error: 'K' was not declared in this scope
    2 |         cin>>N>>K;
      |                 ^
a.cc:3:9: error: 'D' was not declared in this scope
    3 |         D("N = %d K = %d \n",N,K);
      |         ^
a.cc:5:26: error: 'string' was not declared in this scope
    5 |                 int x,y; string c;
      |                          ^~~~~~
a.cc:6:28: error: 'c' was not declared in this scope
    6 |                 cin>>x>>y>>c;
      |                            ^
a.cc:10:25: error: 'w' was not declared in this scope
   10 |                         w[x][y]+=1;
      |                         ^
a.cc:11:25: error: 'numWhite' was not declared in this scope
   11 |                         numWhite++;
      |                         ^~~~~~~~
a.cc:13:25: error: 'b' was not declared in this scope
   13 |                         b[x][y]+=1;
      |                         ^
a.cc:14:25: error: 'numBlack' was not declared in this scope
   14 |                         numBlack++;
      |                         ^~~~~~~~
a.cc:17:43: error: 'numBlack' was not declared in this scope
   17 |         D("numBlack = %d numWhite = %d\n",numBlack,numWhite);
      |                                           ^~~~~~~~
a.cc:17:52: error: 'numWhite' was not declared in this scope
   17 |         D("numBlack = %d numWhite = %d\n",numBlack,numWhite);
      |                                                    ^~~~~~~~
a.cc:21:17: error: 'dpw' was not declared in this scope
   21 |                 dpw[x][y]=w[x][y]+(x==0?0:dpw[x-1][y])+(y==0?0:dpw[x][y-1])-((y==0||x==0)?0:dpw[x-1][y-1]);
      |                 ^~~
a.cc:21:27: error: 'w' was not declared in this scope
   21 |                 dpw[x][y]=w[x][y]+(x==0?0:dpw[x-1][y])+(y==0?0:dpw[x][y-1])-((y==0||x==0)?0:dpw[x-1][y-1]);
      |                           ^
a.cc:22:17: error: 'dpb' was not declared in this scope
   22 |                 dpb[x][y]=b[x][y]+(x==0?0:dpb[x-1][y])+(y==0?0:dpb[x][y-1])-((y==0||x==0)?0:dpb[x-1][y-1]);
      |                 ^~~
a.cc:22:27: error: 'b' was not declared in this scope
   22 |                 dpb[x][y]=b[x][y]+(x==0?0:dpb[x-1][y])+(y==0?0:dpb[x][y-1])-((y==0||x==0)?0:dpb[x-1][y-1]);
      |                           ^
a.cc:30:17: error: 'vector' was not declared in this scope
   30 |                 vector<rect> whiteRectangles;
      |                 ^~~~~~
a.cc:30:24: error: 'rect' was not declared in this scope
   30 |                 vector<rect> whiteRectangles;
      |                        ^~~~
a.cc:30:30: error: 'whiteRectangles' was not declared in this scope
   30 |                 vector<rect> whiteRectangles;
      |                              ^~~~~~~~~~~~~~~
a.cc:33:41: error: 'ii' was not declared in this scope
   33 |                 whiteRectangles.PB(rect(ii(x1,y1),ii(x2,y2)));
      |                                         ^~
a.cc:33:57: error: 'y2' was not declared in this scope; did you mean 'x2'?
   33 |                 whiteRectangles.PB(rect(ii(x1,y1),ii(x2,y2)));
      |                                                         ^~
      |                                                         x2
a.cc:35:57: error: 'y3' was not declared in this scope; did you mean 'x3'?
   35 |                 whiteRectangles.PB(rect(ii(x2,y2),ii(x3,y3)));
      |                                                         ^~
      |                                                         x3
a.cc:39:26: error: expected ';' before 'r'
   39 |                 for (rect r: whiteRectangles){
      |                          ^~
      |                          ;
a.cc:44:33: error: 'max' was not declared in this scope
   44 |                 best = max(best,max(ans,N-ans));
      |                                 ^~~
a.cc:44:24: error: 'max' was not declared in this scope
   44 |                 best = max(best,max(ans,N-ans));
      |                        ^~~
a.cc:44:48: error: expected ')' before ';' token
   44 |                 best = max(best,max(ans,N-ans));
      |                                                ^
      |                                                )
a.cc:39:21: note: to match this '('
   39 |                 for (rect r: whiteRectangles){
      |                     ^
a.cc:46:9: error: 'cout' was not declared in this scope
   46 |         cout<<best<<"\n";
      |         ^~~~
a.cc:47:9: error: 'vector' was not declared in this scope
   47 |         vector<ii> toOup;
      |         ^~~~~~
a.cc:47:16: error: 'ii' was not declared in this scope
   47 |         vector<ii> toOup;
      |                ^~
a.cc:47:20: error: 'toOup' was not declared in this scope
   47 |         vector<ii> toOup;
      |                    ^~~~~
a.cc:51:16: error: expected ';' before 'x'
   51 |         for (ii x: toOup){
      |                ^~
      |                ;
a.cc:54:1: error: expected primary-expression before '}' token
   54 | }
      | ^
a.cc:53:10: error: expected ';' before '}' token
   53 |         }
      |          ^
      |          ;
   54 | }
      | ~         
a.cc:54:1: error: expected primary-expression before '}' token
   54 | }
      | ^
a.cc:53:10: error: expected ')' before '}' token
   53 |         }
      |          ^
      |          )
   54 | }
      | ~         
a.cc:51:13: note: to match this '('
   51 |         for (ii x: toOup){
      |             ^
a.cc:54:1: error: expected primary-expression before '}' token
   54 | }
      | ^