Set up solve state

puzz.c

@@ -42,9 +42,11 @@ void gen(void)
 
 void print(void)
 {
+	puts("Solution:");
 	for (int y = 0; y < HEIGHT; ++y) {
 		for (int x = 0; x < WIDTH; ++x)
 			putchar(soln[x][y] == MINE ? 'x' : '0' + soln[x][y]);
 		putchar('\n');
 	}
+	putchar('\n');
 }