Submission #1825

#	Time	Username	Problem	Language	Result	Execution time	Memory
1825		ainta	Art Class (IOI13_artclass)	C++98	93 / 100	154 ms	8572 KiB

artclass

#include "artclass.h"

int abs(int a){
	return a<0?-a:a;
}
int P[501][501],C,Q[250001],h,t,HH,WW,Count[250001];
int Ca[501],Cb[501],Cc[1001],Cd[1001];
struct A{
	int r,g,b;
}w[501][501];
struct B{
	int r,g,b;
}o[250001];
void Ins(int x,int y){
	P[x][y]=C,Q[++t]=WW*x+y;
}
int pow2(int a){
	return a*a;
}
void Do(int x,int y){
	if(x<0||y<0||x>=HH||y>=WW||P[x][y])return;
	if(pow2(abs(w[x][y].r-o[C].r))+pow2(abs(w[x][y].g-o[C].g))+pow2(abs(w[x][y].b-o[C].b))>1000)return;
	return Ins(x,y);
}
void BFS(int x,int y){
	o[C].r=w[x][y].r,o[C].g=w[x][y].g,o[C].b=w[x][y].b;
	h=t=0;
	Ins(x,y);
	while(h<t){
		Count[C]++;
		++h;
		x=Q[h]/WW,y=Q[h]%WW;
		Do(x-1,y);
		Do(x+1,y);
		Do(x,y-1);
		Do(x,y+1);
	}
}
int min(int a,int b){
	return a<b?a:b;
}
int style(int H, int W, int R[500][500], int G[500][500], int B[500][500]) {
	HH=H,WW=W;
	int i,j,GG=0,BB=0,RR=0;
	for(i=0;i<H;i++)
		for(j=0;j<W;j++)
			w[i][j].r=R[i][j],w[i][j].g=G[i][j],w[i][j].b=B[i][j],GG+=G[i][j],BB+=B[i][j],RR+=R[i][j];
	for(i=0;i<H;i++){
		for(j=0;j<W;j++){
			if(!P[i][j]){
				C++;
				BFS(i,j);
			}
		}
	}
	int Sa=0,Sb=0,Sc=0,Sd=0;
	double sc,sd,k,tp;
	for(i=0;i<H;i++){
		for(j=0;j<W;j++){
			if(j<W-1 && P[i][j]!=P[i][j+1])Ca[j]++,Sa++;
			if(i<H-1 && P[i][j]!=P[i+1][j])Cb[i]++,Sb++;
			if(i<H-1 && j<W-1 && P[i][j]!=P[i+1][j+1])Cc[i+j]++,Sc++;
			if(i<H-1 && j && P[i][j]!=P[i+1][j-1])Cd[i-j+W-1]++,Sd++;
		}
	}
	Sa/=W,Sb/=H,sc=Sc,sd=Sd,k=(H-1)*(W-1);
	sc/=k,sd/=k;
	int C1=0,C2=0,C3=0,C4=0,C5=0,C6=0,C7=0,C8=0;
	for(i=0;i<W-1;i++){
		if(Ca[i]-Sa>=H/3){
			C1++;
			if(i>=W/7 && i<= 6*W/7) C5++;
		}
	}
	for(i=0;i<H-1;i++){
		if(Cb[i]-Sb>=W/3){
			C2++;
			if(i>=H/7 && i<= 6*H/7) C6++;
		}
	}
	int aa=0,bb=0,cc=0,dd=0;
	for(i=0;i<H+W-1;i++){
		tp=Cc[i],k=aa-cc+1;
		aa++,dd++;
		if(aa==W)aa--,bb++;
		if(dd==H)dd--,cc++;
		if(k<min(H,W)/7)continue;
		if(tp/k>sc+0.5){
			C7++;
		}
	}
	for(i=0;i<H+W-1;i++){
		tp=Cd[i],k=aa-cc+1;
		aa++,dd++;
		if(aa==W)aa--,bb++;
		if(dd==H)dd--,cc++;
		if(k<min(H,W)/7)continue;
		if(tp/k>sd+0.5){
			C8++;
		}
	}
	if(C7||C8)return 1;
	if(C1>1 || C2>1){
		if(C5==0 || C6==0)return 4;
		return 1;
	}
	if(Sa<W*2/3 && Sb<H*2/3)return 2;
	return 3;
}

Compilation message (stderr)

artclass.cpp: In function 'int style(int, int, int (*)[500], int (*)[500], int (*)[500])':
artclass.cpp:68:16: warning: unused variable 'C3' [-Wunused-variable]
  int C1=0,C2=0,C3=0,C4=0,C5=0,C6=0,C7=0,C8=0;
                ^~
artclass.cpp:68:21: warning: unused variable 'C4' [-Wunused-variable]
  int C1=0,C2=0,C3=0,C4=0,C5=0,C6=0,C7=0,C8=0;
                     ^~

• Subtask 1: 93 / 100