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day03.c
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day03.c
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#include <stdio.h>
#include <stdlib.h>
int spiral_dist(int square) {
int x=0;
int y=0;
int ring=0;
for (int i=1; i<square; i++) {
if (x == ring && y == -ring) {
x++;
ring++;
} else if (y == -ring) {
x++;
} else if (x == -ring) {
y--;
} else if (y == ring) {
x--;
} else if (x == ring) {
y++;
}
}
return abs(x) + abs(y);
}
#define SIZE 32
int next_spiral_val(int val) {
int grid[2*SIZE-1][2*SIZE-1] = {0};
int x=0;
int y=0;
int ring=0;
int a, b;
int ret;
grid[SIZE][SIZE] = 1;
for (int i=1; ring<SIZE; i++) {
if (x == ring && y == -ring) {
x++;
ring++;
} else if (y == -ring) {
x++;
} else if (x == -ring) {
y--;
} else if (y == ring) {
x--;
} else if (x == ring) {
y++;
}
for (a=-1; a<=1; a++) {
for (b=-1; b<=1; b++) {
if (a != 0 || b != 0) {
ret = grid[SIZE+x][SIZE+y] += grid[SIZE+x+a][SIZE+y+b];
}
}
}
if (ret > val) {
return ret;
}
}
return -1;
}
int main(int argc, char* argv[]) {
int input = atoi(argv[1]);
printf("Part 1: %d\n", spiral_dist(input));
printf("Part 2: %d\n", next_spiral_val(input));
}