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import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.Arrays;
import java.util.ArrayList;
import java.util.regex.Pattern;
public class day05 {
public static void main(String args[]) throws IOException {
RandomAccessFile input = new RandomAccessFile("input", "r");
System.out.println("Day 05 Part 1: " + part1(input));
input.seek(0);
System.out.println("Day 05 Part 2: " + part2(input));
input.close();
}
public static String part1(RandomAccessFile input) throws IOException {
Garden garden = parseGarden(input);
long min_loc = Long.MAX_VALUE;
for (long seed: garden.seeds) {
long loc = garden.location(seed);
if (loc < min_loc) {
min_loc = loc;
}
}
return Long.toString(min_loc);
}
public static String part2(RandomAccessFile input) throws IOException {
Garden garden = parseGarden(input);
long min_loc = Long.MAX_VALUE;
long start = -1;
long length = -1;
for (long seed: garden.seeds) {
if (start == -1) {
start = seed;
continue;
}
length = seed;
for(long s = start; s < start + length; s++) {
long loc = garden.location(s);
if (loc < min_loc) {
min_loc = loc;
}
}
start = -1;
}
return Long.toString(min_loc);
}
private static Garden parseGarden(RandomAccessFile input) throws IOException {
Garden garden = new Garden();
String line;
int state = -1;
while ((line = input.readLine()) != null) {
if (Pattern.matches("\\Aseeds:.*", line)) {
String[] seeds = line.split(": ")[1].split(" ");
for (String seed: seeds) {
garden.seeds.add(Long.parseLong(seed));
}
} else if (Pattern.matches(".* map:\\z", line)) {
state += 1;
} else if (Pattern.matches("\\d+ \\d+ \\d+", line)) {
String[] linea = line.split(" ");
long dst = Long.parseLong(linea[0]);
long src = Long.parseLong(linea[1]);
long len = Long.parseLong(linea[2]);
switch (state) {
case 0:
garden.almanac.s2s.add(dst, src, len);
break;
case 1:
garden.almanac.s2f.add(dst, src, len);
break;
case 2:
garden.almanac.f2w.add(dst, src, len);
break;
case 3:
garden.almanac.w2l.add(dst, src, len);
break;
case 4:
garden.almanac.l2t.add(dst, src, len);
break;
case 5:
garden.almanac.t2h.add(dst, src, len);
break;
case 6:
garden.almanac.h2l.add(dst, src, len);
break;
}
}
}
return garden;
}
}
class Garden {
ArrayList<Long> seeds;
Almanac almanac;
public Garden() {
this.seeds = new ArrayList<>();
this.almanac = new Almanac();
}
public long location(long seed) {
long at = seed;
for (Map map: this.almanac.maps) {
for (MapEntry ent: map.mapEntries) {
if (ent.contains(at)) {
at = ent.map(at);
break;
}
}
}
return at;
}
}
class Almanac {
Map s2s, s2f, f2w, w2l, l2t, t2h, h2l;
ArrayList<Map> maps;
public Almanac() {
this.s2s = new Map();
this.s2f = new Map();
this.f2w = new Map();
this.w2l = new Map();
this.l2t = new Map();
this.t2h = new Map();
this.h2l = new Map();
ArrayList<Map> maps = new ArrayList<>();
maps.add(this.s2s);
maps.add(this.s2f);
maps.add(this.f2w);
maps.add(this.w2l);
maps.add(this.l2t);
maps.add(this.t2h);
maps.add(this.h2l);
this.maps = maps;
}
}
class Map {
ArrayList<MapEntry> mapEntries;
public Map() {
mapEntries = new ArrayList<>();
}
public void add(long dst, long src, long len) {
mapEntries.add(new MapEntry(dst, src, len));
}
}
class MapEntry {
long dst, src, len;
public MapEntry(long dst, long src, long len) {
this.dst = dst;
this.src = src;
this.len = len;
}
public boolean contains(long src) {
return src >= this.src && src < (this.src + this.len);
}
public long map(long src) {
return this.dst + (src - this.src);
}
}
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