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part2.c
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part2.c
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#include <stdio.h>
#include <stdlib.h>
#include <math.h>
// solution time: 5:32.20 (mm:ss.ms)
typedef struct coords {
int x;
int y;
} Coords;
typedef struct ArrayList {
Coords* data;
int size;
int capacity;
} ArrayList;
ArrayList* initializeArrayList(int initialCapacity)
{
ArrayList* arrayList = (ArrayList*) malloc(sizeof(ArrayList));
arrayList->data = (Coords*) malloc(sizeof(Coords) * initialCapacity);
arrayList->size = 0;
arrayList->capacity = initialCapacity;
return arrayList;
}
void freeArrayList(ArrayList* arrayList)
{
free(arrayList->data);
free(arrayList);
}
void resizeArrayList(ArrayList* arrayList, int newCapacity)
{
Coords* newData = (Coords*) realloc(arrayList->data, sizeof(Coords) * newCapacity);
if (newData == NULL) {
printf("Error reallocating memory!\n");
return;
}
arrayList->data = newData;
arrayList->capacity = newCapacity;
}
void addElement(ArrayList* arrayList, Coords element)
{
if (arrayList->size == arrayList->capacity) {
int newCapacity = arrayList->capacity == 0 ? 1 : arrayList->capacity * 2;
resizeArrayList(arrayList, newCapacity);
}
arrayList->data[arrayList->size++] = element;
}
Coords getElement(const ArrayList* arrayList, int index)
{
if (index < 0 || index >= arrayList->size) {
printf("Index %d out of bounds for array list of size %d\n", index, arrayList->size);
return (Coords) {NAN, NAN};
}
return arrayList->data[index];
}
int main() {
// read input from input.in
FILE *fp = fopen("input.in", "r");
// define variables
ArrayList *coords = initializeArrayList(0);
addElement(coords, (Coords) {0, 0}); // add first coord
int santaX = 0, santaY = 0;
int roboX = 0, roboY = 0;
int santa = 1;
// read input
int c;
while ((c = fgetc(fp)) != EOF) {
int *x, *y;
switch (santa) {
case 1:
santa = 0;
x = &santaX;
y = &santaY;
break;
case 0:
santa = 1;
x = &roboX;
y = &roboY;
break;
}
// update coords
switch (c) {
case '^':
(*y)++;
break;
case 'v':
(*y)--;
break;
case '>':
(*x)++;
break;
case '<':
(*x)--;
break;
default:
printf("Error: invalid character '%c'!\n", c);
exit(1);
}
// ! I ran part 1... again... 🤦 this was used to Debug but made me realize I was running part 1
// printf("%s: %d, %d\n", santa ? "Santa" : "Robo", *x, *y);
// add coord
addElement(coords, (Coords) {*x, *y});
}
// loop through coords and count unique coords
int unique_coords = 0;
for (int i = 0; i < coords->size; i++) {
Coords coord = getElement(coords, i);
int unique = 1;
for (int j = 0; j < i; j++) {
Coords other = getElement(coords, j);
if (coord.x == other.x && coord.y == other.y) {
unique = 0;
break;
}
}
if (unique) unique_coords++;
}
// close input.in
fclose(fp);
// print answer
printf("%d\n", unique_coords);
return 0;
}