diff --git a/source/solver.c b/source/solver.c
index 43546c237015e776852678e96ed03ac36c410db7..1791a7558015d0463ca04974208fd91757f9a502 100644
--- a/source/solver.c
+++ b/source/solver.c
@@ -1,5 +1,5 @@
 /* solver.c */
-/* Last Change: 2018/07/09 (Mon) 15:54:41. */
+/* Last Change: 2018/07/16 (Mon) 10:05:50. */
 
 #include<stdio.h>
 /* #include<stdlib.h> */
@@ -8,7 +8,8 @@
 /* #include<math.h> */
 /* #include<time.h> */
 
-int board[8][72][72];
+int board[8][72][72]={};
+int avail[8][72][72]={};
 int depth,height,width;
 int lines;
 //z,y,x
@@ -91,11 +92,50 @@ int connected(int line){
 	return 0;
 }
 
-int connectable(int linea,int lineb){
-	//REQUIRED
+int available(int startx,int starty, int startz){
+	if(avail[startz][starty][startx]==-1)
+		return 1;
+	if(startx>0&&available(startx-1,starty,startz))
+		return 1;
+	if(starty>0&&available(startx,starty-1,startz))
+		return 1;
+	if(startz>0&&available(startx,starty,startz-1))
+		return 1;
+	if(startx<depth&&available(startx+1,starty,startz))
+		return 1;
+	if(starty<height&&available(startx,starty+1,startz))
+		return 1;
+	if(startz<width&&available(startx,starty,startz+1))
+		return 1;
 	return 0;
 }
 
+int connectable(int linea,int lineb){
+	int startx=-1,starty=-1,startz=-1,notfound=1;
+	int i,j,k;
+	for(i=0;i<depth;i++)
+		for(j=0;j<height;j++)
+			for(k=0;k<width;k++)
+				if(board[i][j][k]==-linea)
+					if(notfound){
+						notfound=0;
+						avail[i][j][k]=1;
+						startz=i;
+						starty=j;
+						startx=k;
+					}else
+						avail[i][j][k]=-1;
+					else if(board[i][j][k]==0||board[i][j][k]==lineb||board[i][j][k]==linea)
+						avail[i][j][k]=1;
+					else
+						avail[i][j][k]=0;
+	if(startx==-1||starty==-1||startz==-1){
+		printf("Error!\n");
+		return 0;
+	}
+	return available(startx,starty,startz);
+}
+
 void actuallyconnect(int num){
 	//REQUIRED
 	return;
@@ -153,7 +193,7 @@ void write(void){
 }
 
 int main(void){
-	reset();
+	/* reset(); */
 	read();
 	solve();
 	write();