#include <stdio.h>
#include <stdlib.h>
#include <memory.h>

#define FieldSize 20
/*#define TimeMax 200*/

/*フィールドの初期化 (ファイルの読み込み)*/
void init_field(int field[FieldSize][FieldSize], char *fname){
	int i,j;
	FILE *fp;

	if ((fp=fopen(fname,"r"))==NULL){
		printf("init_field(): Cannot open \"%s\"\n", fname);
		exit(1);
	}

	for (i=0; i<FieldSize; i++) {
		for(j=0; j<FieldSize; j++) {
			fscanf(fp, "%d ", &field[i][j]);
		}
		fscanf(fp, "\n");
	}
	fclose(fp);
}

int around_count(int I, int J, int field[FieldSize][FieldSize]){
	int i,j;
	int sum = 0;
	for(i=-1; i<=1; i++){
		for(j=-1 ;j<=1; j++){
			if (I+i < 0) continue;
			if (J+j < 0) continue;
			if (I+i >= FieldSize) continue;
			if (J+j >= FieldSize) continue;
			if (i==0 && j==0) continue;
			if (field[I+i][J+j]==1)
				sum++;
		}
	}
	return sum;
}

void update_field(int field[FieldSize][FieldSize]){
	int i,j;
	int around;       
	int new_field[FieldSize][FieldSize]; 
	for(i=0; i<FieldSize; i++){
		for(j=0; j<FieldSize; j++){
			new_field[i][j] = 1;
			around = around_count(i,j,field);
			if (field[i][j]==0 && around==3) continue;
			if (field[i][j]==1 && (around==3 || around==2)) continue;
			new_field[i][j] = 0;
		}
	}
	memcpy((void*)field, (void*)new_field, sizeof(new_field));
}

void display(int field[FieldSize][FieldSize]){
	int i,j;
	for (i=0; i<FieldSize; i++) {
		for (j=0; j<FieldSize; j++) {
			if (field[i][j]==1) {
				printf("@ ");
			} else {
				printf("_ ");
			}       
		}       
		printf("\n");
	}
}

int main(int argc, char *argv[]){
	int t;
	int field[FieldSize][FieldSize];

	if(argc!=2){
		printf("実行方法 : ./a.out 初期状態のファイル\n");
		exit(1);
	}

	init_field(field, argv[1]);
	system("clear");
	for (;;) {
		system("clear");
		update_field(field);
		display(field);
		/*usleep(200000);*/
		getchar();
	}

	return 0;
}