fix

solver.c

 /* solver.c */
-/* Last Change: 2019/07/25 (Thu) 14:39:28. */
+/* Last Change: 2019/07/29 (Mon) 09:32:40. */
 
 #include<stdio.h>
 #include<limits.h>
@@ -151,10 +151,23 @@ short int search_placable(short int blockid){ //calc the cost (sum of Euclidean
 	short int i,j,k,l,index=0;
 	short int place[5][2]; //(relative) place of edge #block_data[blockid][1-4][] (x,y)
 	short int blockw=0,blockh=0;
+	/* calc cost */
 	if(block_data[blockid][2][2]==-1){ //if monomino
-		return 1;
+		for(i=0;i<MAXSIZE;i++)
+			for(j=0;j<MAXSIZE;j++){
+				cost[i][j][0]=0;
+				if(board_beta[i][j]==block_data[blockid][1][2]){
+					if(i+1<MAXSIZE&&board_beta[i+1][j]==0)
+						cost[i+1][j][0]=1;
+					if(j+1<MAXSIZE&&board_beta[i][j+1]==0)
+						cost[i][j+1][0]=1;
+					if(i-1>=0&&board_beta[i-1][j]==0)
+						cost[i-1][j][0]=1;
+					if(j-1>=0&&board_beta[i][j-1]==0)
+						cost[i][j-1][0]=1;
 				}
-	/* calc cost */
+			}
+	}else{
 		for(k=1;k<=4;k++){
 			place[k][0]=SHRT_MIN;
 			place[k][1]=SHRT_MIN;
@@ -199,6 +212,7 @@ short int search_placable(short int blockid){ //calc the cost (sum of Euclidean
 				}
 			}
 		}
+	}
 	/* calc costrank */
 	for(i=0;i<MAXSIZE;i++)
 		for(j=0;j<MAXSIZE;j++)