diff --git a/README.md b/README.md
new file mode 100644
index 0000000000000000000000000000000000000000..165f7617447e84ce6765299ecc77e027d6392695
--- /dev/null
+++ b/README.md
@@ -0,0 +1,6 @@
+Usage:
+
+...
+!gcc *.c -O0 -lm -g -o main -Wall;
+!./main
+...
diff --git a/io.c b/io.c
index 7df667f2c5f38eea2e04ca573b49518db315a408..40df260ba871da62e0b09ae29ae63b54c63a96f5 100644
--- a/io.c
+++ b/io.c
@@ -1,5 +1,5 @@
 /* io.c */
-/* Last Change: 2019/06/03 (Mon) 06:32:01. */
+/* Last Change: 2019/07/23 (Tue) 17:06:53. */
 
 #include<stdio.h>
 #include"io.h"
@@ -30,7 +30,7 @@ void read_problem(void){
 	reset_parameters();
 	int x,y; //size of block
 	int i,j,k;
-	int nowx=0,nowblock=1,num=0; //used for block reading
+	int nowx=0,nowblock=1,num=0,nonzero=0; //used for block reading
 	char c,str[32]; // must be 20 or more
 	scanf(" %s",str); //SIZE
 	scanf(" %hd",&W);
@@ -56,19 +56,24 @@ void read_problem(void){
 		nowblock=1;
 		gets(str);
 		for(j=0;j<y;j++){ //=nowy
-			nowx=num=0;
+			nowx=num=nonzero=0;
 			gets(str);
 			for(k=0;;k++){
-				if(str[k]=='0')
-					num=-1;
-				else if(str[k]=='+')
-					num=0;
-				else if('1'<=str[k]&&str[k]<='9')
+				if('1'<=str[k]&&str[k]<='9'){
 					num=num*10+str[k]-'0';
+					nonzero=1;
+				}else if(str[k]=='+')
+					num=0;
+				else if(str[k]=='0')
+					if(nonzero)
+						num=num*10+str[k]-'0';
+					else
+						num=-1;
 				else if(str[k]==','){
 					if(num<0){
 						num=0;
 						nowx++;
+						nonzero=0;
 						continue;
 					}
 					block_data[i][nowblock][0]=nowx;
@@ -77,9 +82,11 @@ void read_problem(void){
 					nowx++;
 					num=0;
 					nowblock++;
+					nonzero=0;
 				}else if(str[k]=='\0'){
 					if(num<0){
 						num=0;
+						nonzero=0;
 						break;
 					}
 					block_data[i][nowblock][0]=nowx;
@@ -87,6 +94,7 @@ void read_problem(void){
 					block_data[i][nowblock][2]=num;
 					num=0;
 					nowblock++;
+					nonzero=0;
 					break;
 				}
 			}
@@ -103,8 +111,8 @@ void print_answer(void){
 	printf("SIZE %dX%d\n",w,h);
 	for(i=0;i<h;i++){
 		for(j=0;j<w;j++){
-			printf("%d",board_data[j][i]);
-			if(j==h-1)
+			printf("%3d",board_data[j][i]);
+			if(j==w-1)
 				printf("\n");
 			else
 				printf(",");
diff --git a/main b/main
new file mode 100755
index 0000000000000000000000000000000000000000..67aa4ccdaf209575a449595dc19fbd81593764bc
Binary files /dev/null and b/main differ
diff --git a/main.dSYM/Contents/Info.plist b/main.dSYM/Contents/Info.plist
new file mode 100644
index 0000000000000000000000000000000000000000..fe7fecda1c184a054ec939b20faf39aaeab1d27c
--- /dev/null
+++ b/main.dSYM/Contents/Info.plist
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+	<dict>
+		<key>CFBundleDevelopmentRegion</key>
+		<string>English</string>
+		<key>CFBundleIdentifier</key>
+		<string>com.apple.xcode.dsym.main</string>
+		<key>CFBundleInfoDictionaryVersion</key>
+		<string>6.0</string>
+		<key>CFBundlePackageType</key>
+		<string>dSYM</string>
+		<key>CFBundleSignature</key>
+		<string>????</string>
+		<key>CFBundleShortVersionString</key>
+		<string>1.0</string>
+		<key>CFBundleVersion</key>
+		<string>1</string>
+	</dict>
+</plist>
diff --git a/main.dSYM/Contents/Resources/DWARF/main b/main.dSYM/Contents/Resources/DWARF/main
new file mode 100644
index 0000000000000000000000000000000000000000..2ce32e73f4be60b8e4cb499a93e09eeba7ab9fbb
Binary files /dev/null and b/main.dSYM/Contents/Resources/DWARF/main differ
diff --git a/solver.c b/solver.c
index a2a7aa20b18810e19265a0c419be32d3d28cbb33..ff9249311f9066f52559978677cf6b4b5ca4154f 100644
--- a/solver.c
+++ b/solver.c
@@ -1,35 +1,305 @@
 /* solver.c */
-/* Last Change: 2019/05/21 (Tue) 18:09:17. */
+/* Last Change: 2019/07/23 (Tue) 17:13:18. */
 
+#include<stdio.h>
 #include<limits.h>
 #include"solver.h"
 #include"io.h"
-/* #include<stdio.h> */
 /* #include<stdlib.h> */
 /* #include<string.h> */
 /* #include<math.h> */
 /* #include<time.h> */
+#define DEBUG 0
+#define abs(a) ((a) < 0 ? - (a) : (a))
 
-short int connected[MAXLINE]={0}; //if line connected:2, if one end:1, otherwize:0
+/* short int connected[MAXLINE+1]={0}; //if line connected:2, if one end:1, otherwize:0 */
 short int board_beta[MAXSIZE][MAXSIZE]; //big board data
 //edge:1~MAXLINE, line:-1~-MAXLINE, none:0, wall:SHRT_MIN
-short int rank[MAXBLOCK+1];
+short int rank[MAXBLOCK+1]; //ranking of point below, 0:unused, 1~
+short int point[MAXBLOCK+1]; //XYZ
+//X: search priority, Y: number of edges in board, Z: number of edges in block
+short int first_block=1;
+short int costrank[1+MAXBLOCK*MAXBLOCK][2]; //ranking of cost: block being in (costrank[ranking][0],costrank[ranking][0])
 
-void reset_board(void){
-	int i,j;
+void print_board_beta(void){
+	short int i,j;
+	for(i=0;i<MAXSIZE;i++){
+		for(j=0;j<MAXSIZE;j++){
+			printf("%d",board_beta[j][i]);
+			if(j==MAXSIZE-1)
+				printf("\n");
+			else
+				printf(",");
+		}
+	}
+	return;
+}
+
+void update_ranks(void){
+	short int i,j;
+	for(i=1;i<=blocks;i++){
+		rank[i]=1;
+	}
+	for(i=1;i<=blocks;i++){
+		for(j=1;j<=blocks;j++)
+			if(point[i]<point[j])
+				rank[i]++;
+			else if(point[i]==point[j] && i>j)
+				rank[i]++;
+	}
+	if(DEBUG){
+		for(i=1;i<=blocks;i++){
+			printf("%d ",rank[i]);
+		}
+		printf("\n");
+	}
+	return;
+}
+
+void reset(void){ //excluding init_points
+	short int i,j;
 	for(i=0;i<MAXSIZE;i++)
 		for(j=0;j<MAXSIZE;j++)
 			board_beta[i][j]=0;
+	for(i=1;i<=blocks;i++){
+		block_data[i][0][0]=-1;
+		block_data[i][0][1]=-1;
+		point[i]-=((point[i]/10)%10)*10; //reset Y
+	}
+	/* for(i=1;i<=MAXLINE;i++){ */
+	/* connected[i]=0; */
+	/* } */
+	update_ranks();
+	first_block=1;
 	return;
 }
 
-void read_data(void){
+void init_points(void){ //use only once
+	short int i,j;
+	for(i=1;i<=blocks;i++){
+		point[i]=0;
+		for(j=1;j<=4;j++)
+			if(block_data[i][j][2]>0) //if edge exists
+				point[i]++;
+	}
+	update_ranks();
 	return;
 }
 
-void translate(void){
-	int i,j;
-	int minw=MAXSIZE-1,maxw=0,minh=MAXSIZE-1,maxh=0;
+void add_point(short int blockid,short int lineid){ //use only once
+	short int i,j;
+	for(i=1;i<=blocks;i++)
+		if(i!=blockid)
+			for(j=1;j<=4;j++)
+				if(block_data[i][j][2]==lineid) //if edge exists
+					point[i]+=10;
+	return;
+}
+
+/* short int random(short int id){ //edit this to randomly place blocks */
+/* return id; */
+/* } */
+
+short int search_placable(short int blockid){ //calc the cost (sum of Euclidean distance of lines), returns the number of places
+	short int cost[MAXSIZE][MAXSIZE][2]; //cost[x][y][0]:cost, cost[x][y][1]:rank
+	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;
+	if(block_data[blockid][2][2]==-1){ //if monomino
+		return 1;
+	}
+	/* calc cost */
+	for(k=1;k<=4;k++){
+		place[k][0]=SHRT_MIN;
+		place[k][1]=SHRT_MIN;
+		for(i=0;i<MAXSIZE;i++){
+			for(j=0;j<MAXSIZE;j++)
+				if(board_beta[i][j]>0 && board_beta[i][j]==block_data[blockid][k][2]){
+					place[k][0]=i-block_data[blockid][k][0];
+					place[k][1]=i-block_data[blockid][k][1];
+				}
+		}
+		/* printf("%d, %d\n",place[k][0],place[k][1]); */
+	}
+	for(k=1;k<=4;k++){
+		if(block_data[blockid][k][0]>blockw)
+			blockw=block_data[blockid][k][0];
+		if(block_data[blockid][k][1]>blockh)
+			blockh=block_data[blockid][k][1];
+	}
+	/* printf("%d: %d, %d\n",blockid,blockw,blockh); */
+	for(i=0;i<MAXSIZE;i++){
+		for(j=0;j<MAXSIZE;j++){
+			cost[i][j][1]=1;
+			if(i+blockw>=MAXSIZE || j+blockh>=MAXSIZE) //out of board
+				cost[i][j][0]=-1;
+			else if(   0!=board_beta[i+block_data[blockid][1][0]] [j+block_data[blockid][1][1]] //alredy something
+					|| 0!=board_beta[i+block_data[blockid][2][0]] [j+block_data[blockid][2][1]]
+					|| 0!=board_beta[i+block_data[blockid][3][0]] [j+block_data[blockid][3][1]]
+					|| 0!=board_beta[i+block_data[blockid][4][0]] [j+block_data[blockid][4][1]])
+				cost[i][j][0]=-1;
+			else{
+				cost[i][j][0]=0;
+				/* printf("%d, %d\n",abs(i-place[k][0]),abs(j-place[k][1])); */
+				/* printf("%d\n",abs(i-place[k][0])+abs(j-place[k][1])); */
+				for(k=1;k<=4;k++){
+					if(place[k][0]!=SHRT_MIN)
+						cost[i][j][0]+=abs(i-place[k][0]);
+					if(place[k][1]!=SHRT_MIN)
+						cost[i][j][0]+=abs(j-place[k][1]);
+				}
+				if(cost[i][j][0]==0)
+					cost[i][j][0]=abs(i-MAXSIZE/2)+abs(j-MAXSIZE/2);
+				/* cost[i][j][0]+=(short int)abs((int)(i-place[k][0]))+(short int)abs((int)(j-place[k][1])); */
+				cost[i][j][0]=10000-cost[i][j][0];
+				/* printf("%d\n",cost[i][j][0]); */
+			}
+		}
+	}
+	//ok
+	/* calc costrank */
+	for(i=0;i<MAXSIZE;i++)
+		for(j=0;j<MAXSIZE;j++)
+			for(k=0;k<MAXSIZE;k++)
+				for(l=0;l<MAXSIZE;l++)
+					if(cost[i][j][0]<cost[k][l][0])
+						cost[i][j][1]++;
+					else if(cost[i][j][0]==cost[k][l][0] && (i>k || (i==k&&j>l)))
+						cost[i][j][1]++;
+	for(i=0;i<MAXSIZE;i++)
+		for(j=0;j<MAXSIZE;j++){
+			if(!index && cost[i][j][0]<0)
+				index=cost[i][j][1];
+			costrank[cost[i][j][1]] [0]=i;
+			costrank[cost[i][j][1]] [1]=j;
+		}
+	/* printf("%d\n",cost [costrank[1][0]] [costrank[1][1]] [0]); */
+	return index-1;
+}
+
+short int try_wire(short int blockid){
+	return 1;
+}
+
+void place_block(short int blockid,short int x,short int y){
+	short int i;
+	/* printf("%d: %d %d\n",blockid,x,y); */
+	block_data[blockid][0][0]=x;
+	block_data[blockid][0][1]=y;
+	if(block_data[blockid][1][2]>0){
+		board_beta[x+block_data[blockid][1][0]] [y+block_data[blockid][1][1]]=block_data[blockid][1][2];
+		add_point(blockid,block_data[blockid][1][2]);
+	}else{
+		board_beta[x+block_data[blockid][1][0]] [y+block_data[blockid][1][1]]=SHRT_MIN;
+	}
+	if(block_data[blockid][2][2]!=-1){ //if not monomino
+		for(i=2;i<=4;i++)
+			if(block_data[blockid][i][2]>0){
+				board_beta[x+block_data[blockid][i][0]] [y+block_data[blockid][i][1]]=block_data[blockid][i][2];
+				add_point(blockid,block_data[blockid][i][2]);
+			}else{
+				board_beta[x+block_data[blockid][i][0]] [y+block_data[blockid][i][1]]=SHRT_MIN;
+			}
+	}
+	return;
+}
+
+void erase_line(short int lineid){
+	short int i,j;
+	if(lineid==0)
+		return;
+	for(i=0;i<MAXSIZE;i++)
+		for(j=0;j<MAXSIZE;j++)
+			if(board_beta[i][j]==-lineid)
+				board_beta[i][j]=0;
+	return;
+}
+
+void remove_block(short int blockid){ //not for monomino
+	short int i,j;
+	board_beta[block_data[blockid][0][0]+block_data[blockid][1][0]] [block_data[blockid][0][1]+block_data[blockid][1][1]]=0;
+	erase_line(block_data[blockid][1][2]);
+	if(block_data[blockid][2][2]!=-1){ //if not monomino
+		board_beta[block_data[blockid][0][0]+block_data[blockid][2][0]] [block_data[blockid][0][1]+block_data[blockid][2][1]]=0;
+		board_beta[block_data[blockid][0][0]+block_data[blockid][3][0]] [block_data[blockid][0][1]+block_data[blockid][3][1]]=0;
+		board_beta[block_data[blockid][0][0]+block_data[blockid][4][0]] [block_data[blockid][0][1]+block_data[blockid][4][1]]=0;
+		erase_line(block_data[blockid][2][2]);
+		erase_line(block_data[blockid][3][2]);
+		erase_line(block_data[blockid][4][2]);
+	}
+	block_data[blockid][0][0]=-1;
+	block_data[blockid][0][1]=-1;
+	for(i=1;i<=blocks;i++)
+		if(i!=blockid)
+			for(j=1;j<=4;j++){
+				if(block_data[i][j][2]>0){ //if block exists
+					if(block_data[i][j][2]==block_data[blockid][1][2]){ //if edge exists
+						point[i]-=10;
+					}else if(block_data[blockid][2][2]!=-1){ //if not monomino
+						if(block_data[i][j][2]==block_data[blockid][2][2]){ //if edge exists
+							point[i]-=10;
+						}
+						if(block_data[i][j][2]==block_data[blockid][3][2]){ //if edge exists
+							point[i]-=10;
+						}
+						if(block_data[i][j][2]==block_data[blockid][4][2]){ //if edge exists
+							point[i]-=10;
+						}
+					}
+				}
+			}
+	update_ranks();
+	return;
+}
+
+short int place_and_line(short int blockid){
+	short int i,j;
+	if(first_block==1){
+		first_block--;
+		place_block(blockid,MAXSIZE/2,MAXSIZE/2);
+		return 1;
+	}
+	j=search_placable(blockid);
+	for(i=1;i<=j;i++){
+		place_block(blockid,costrank[i][0],costrank[i][1]);
+		if(try_wire(blockid))
+			return 1;
+		remove_block(blockid);
+	}
+	return 0;
+}
+
+void solve(void){ //solver part
+	short int i, flag, in_process=1;
+	while(in_process){
+		flag=1;
+		for(i=1;i<=blocks;i++)
+			if(block_data[rank[i]][0][0]<0){ //not placed
+				if(!place_and_line(rank[i])){ //if not placable
+					point[i]+=100;
+					if(point[i]>10000){ //no answer
+						printf("Too many attempts!\n");
+						in_process=0; //end solver
+						break;
+					}
+					reset();
+					break; //solve from beginning
+				}
+				flag=0;
+			}
+		if(flag)
+			break;
+	}
+	return;
+}
+
+/* void shape(void){ */
+/* 	return; */
+/* } */
+
+void translate(void){ //translate bigboard to minimal board
+	short int i,j;
+	short int minw=MAXSIZE-1,maxw=0,minh=MAXSIZE-1,maxh=0;
 	for(i=0;i<MAXSIZE;i++){
 		for(j=0;j<MAXSIZE;j++){
 			if(board_beta[i][j]){
@@ -49,25 +319,31 @@ void translate(void){
 		}
 	}
 	for(i=1;i<=blocks;i++){
-		/* block_data[i][0]-=minw; */
-		/* block_data[i][1]-=minh; */
+		block_data[i][0][0]-=minw;
+		block_data[i][0][1]-=minh;
 	}
-	for(i=0;i<maxw-minw;i++){
-		for(j=0;j<maxh-minh;j++){
-			board_data[i][j]=board_beta[i+minw][j+minh];
+	/* printf("%d %d %d %d\n",minw,maxw,minh,maxh); */
+	if(minh<maxh&&minw<maxw)
+		for(i=minw;i<=maxw;i++){
+			for(j=minh;j<=maxh;j++){
+				board_data[i-minw][j-minh]=board_beta[i][j];
+			}
 		}
-	}
-	return;
-}
-
-void solve(void){
+	w=maxw-minw+1;
+	h=maxh-minh+1;
+	if(w<0)
+		w=0;
+	if(h<0)
+		h=0;
 	return;
 }
 
 void solver(void){
-	read_data();
+	init_points();
+	reset();
 	solve();
 	/* shape(); */
+	/* print_board_beta(); */
 	translate();
 	return;
 }