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Day23

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dobiadi
2022-12-24 12:53:46 +01:00
parent 0dc96bc943
commit cbb5c040cd
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define BUFFER_SIZE 256
#define MAP_MAX_SIZE 1024
#define MAX_ELVES 4*1024
#define ROUNDS 10000
typedef struct elf {
int position[2];
int nextPosition[2];
} ELF;
typedef struct linkedDirection {
int (*dir)[2];
struct linkedDirection *next;
char name[16];
} LINKEDDIRECTION;
int directions[4][3][2] = {
{{0, -1}, {1, -1}, {-1, -1}},
{{0, 1}, {-1, 1}, {1, 1}},
{{-1, 0}, {-1, -1}, {-1, 1}},
{{1, 0}, {1, -1}, {1, 1}}
};
int main() {
char buf[BUFFER_SIZE], *p, c;
memset(buf, 0, BUFFER_SIZE);
p = buf;
int y = 0, x = 0;
ELF elves[MAX_ELVES];
int elf_count = 0;
while ((c = getchar()) != EOF) {
*p++ = c;
if (c == '\n') {
p = buf;
while (*p != '\n' && *p != EOF) {
if ((p-buf+1) > x) x = (p-buf+1);
if (*p == '#') {
elves[elf_count].position[0] = (p-buf);
elves[elf_count].position[1] = y;
elf_count++;
}
p++;
}
y++;
memset(buf, 0, BUFFER_SIZE);
p = buf;
}
}
// Set up a circular direction list
LINKEDDIRECTION dirs[4];
dirs[0].dir = directions[0];
sprintf(dirs[0].name, "NORTH");
dirs[0].next = &dirs[1];
dirs[1].dir = directions[1];
sprintf(dirs[1].name, "SOUTH");
dirs[1].next = &dirs[2];
dirs[2].dir = directions[2];
sprintf(dirs[2].name, "WEST");
dirs[2].next = &dirs[3];
dirs[3].dir = directions[3];
sprintf(dirs[3].name, "EAST");
dirs[3].next = &dirs[0];
LINKEDDIRECTION *curr = &dirs[0];
// Put each elf on a map
int **map;
map = (int **)malloc(MAP_MAX_SIZE * sizeof(int*));
for (int i = 0; i < MAP_MAX_SIZE; i++) {
map[i] = (int*)malloc(MAP_MAX_SIZE * sizeof(int));
memset(map[i], 0, MAP_MAX_SIZE * sizeof(int));
}
int ref[2];
ref[0] = (MAP_MAX_SIZE - x)/2;
ref[1] = (MAP_MAX_SIZE - y)/2;
for (int i = 0; i < elf_count; i++) {
map[elves[i].position[0]+ref[0]][elves[i].position[1]+ref[1]] = 1;
}
int izegmozog = 1;
// Simulate 10 rounds
for (int i = 0; i < ROUNDS; i++) {
// DEBUG
// int minX = elves[0].position[0], maxX = elves[0].position[0], minY = elves[0].position[1], maxY = elves[0].position[1];
//
// for (int i = 0; i < elf_count; i++) {
// if (minX > elves[i].position[0]) {
// minX = elves[i].position[0];
// }
// if (maxX < elves[i].position[0]) {
// maxX = elves[i].position[0];
// }
// if (minY > elves[i].position[1]) {
// minY = elves[i].position[1];
// }
// if (maxY < elves[i].position[1]) {
// maxY = elves[i].position[1];
// }
// }
//
// printf("%i,%i %i,%i\n", minX, minY, maxX, maxY);
// for (int i = minY - 1; i <= maxY + 1; i++) {
// for (int j = minX - 1; j <= maxX + 1; j++) {
// if (map[j+ref[0]][i+ref[1]] == 1) {
// printf("#");
// } else {
// printf(".");
// }
// }
// printf("\n");
// }
// DEBUG END
int **moveMap;
moveMap = (int **)malloc(MAP_MAX_SIZE * sizeof(int*));
for (int i = 0; i < MAP_MAX_SIZE; i++) {
moveMap[i] = (int*)malloc(MAP_MAX_SIZE * sizeof(int));
memset(moveMap[i], 0, MAP_MAX_SIZE * sizeof(int));
}
// PLANNING PHASE
// Each elf
for (int j = 0; j < elf_count; j++) {
// Scan each direction
LINKEDDIRECTION dirr = *curr;
int openDirections = 0;
int firstOpen[2] = {-9999, -9999};
for (int k = 0; k < 4; k++) {
int open = 1;
for (int l = 0; l < 3; l++) {
if (map[elves[j].position[0]+ref[0]+dirr.dir[l][0]][elves[j].position[1]+ref[1]+dirr.dir[l][1]] == 1) {
open = 0;
break;
}
}
if (open) {
if (firstOpen[0] == -9999 && firstOpen[1] == -9999) {
firstOpen[0] = elves[j].position[0]+dirr.dir[0][0];
firstOpen[1] = elves[j].position[1]+dirr.dir[0][1];
}
openDirections++;
}
dirr = *dirr.next;
}
if (openDirections == 4 || openDirections == 0) {
// No need to move/Can't move
elves[j].nextPosition[0] = elves[j].position[0];
elves[j].nextPosition[1] = elves[j].position[1];
} else {
elves[j].nextPosition[0] = firstOpen[0];
elves[j].nextPosition[1] = firstOpen[1];
}
moveMap[elves[j].nextPosition[0]+ref[0]][elves[j].nextPosition[1]+ref[1]]++;
}
izegmozog = 0;
// MOVE PHASE
for (int j = 0; j < elf_count; j++) {
// Should I stay or should I go?
if (moveMap[elves[j].nextPosition[0]+ref[0]][elves[j].nextPosition[1]+ref[1]] != 1) {
continue;
}
if (elves[j].position[0] != elves[j].nextPosition[0] || elves[j].position[1] != elves[j].nextPosition[1]) {
izegmozog = 1;
}
// Remove from old position on the map
map[elves[j].position[0]+ref[0]][elves[j].position[1]+ref[1]] = 0;
// Add on new position
map[elves[j].nextPosition[0]+ref[0]][elves[j].nextPosition[1]+ref[1]] = 1;
// Change elf data
elves[j].position[0] = elves[j].nextPosition[0];
elves[j].position[1] = elves[j].nextPosition[1];
}
for (int j = 0; j < MAP_MAX_SIZE; j++) {
free(moveMap[j]);
}
free(moveMap);
curr = curr->next;
if (!izegmozog) {
printf("Rounds to stabilize: %i\n", i+1);
break;
}
}
int minX = elves[0].position[0], maxX = elves[0].position[0], minY = elves[0].position[1], maxY = elves[0].position[1];
for (int i = 0; i < elf_count; i++) {
if (minX > elves[i].position[0]) {
minX = elves[i].position[0];
}
if (maxX < elves[i].position[0]) {
maxX = elves[i].position[0];
}
if (minY > elves[i].position[1]) {
minY = elves[i].position[1];
}
if (maxY < elves[i].position[1]) {
maxY = elves[i].position[1];
}
}
int sum = 0;
for (int i = minY; i <= maxY; i++) {
for (int j = minX; j <= maxX; j++) {
if (map[j+ref[0]][i+ref[1]] != 1) {
sum++;
}
}
}
printf("Rectangle empty spaces after round %i: %i\n", ROUNDS, sum);
for (int i = 0; i < MAP_MAX_SIZE; i++) {
free(map[i]);
}
free(map);
}

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