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#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <malloc.h>
#include <string.h>
#define MAX_INPUT_WIDTH 128
#define MAX_INPUT_HEIGTH 128
#define MAX_INPUT MAX_INPUT_WIDTH * MAX_INPUT_HEIGTH
enum direction {
North,
East,
South,
West
};
int solve(const char *filename)
{
FILE *file = fopen(filename, "r");
// Include space for newline and string terminator
char buffer[8] = { 0 };
enum direction dir = East;
int hor = 0;
int ver = 0;
while (fgets(buffer, 8, file)) {
int n = atoi(buffer + 1);
switch (buffer[0]) {
case 'N':
ver += n;
break;
case 'E':
hor += n;
break;
case 'S':
ver -= n;
break;
case 'W':
hor -= n;
break;
case 'F':
switch (dir) {
case North:
ver += n;
break;
case East:
hor += n;
break;
case South:
ver -= n;
break;
case West:
hor -= n;
break;
}
break;
case 'R':
dir = (enum direction)(((int)dir + (n / 90)) % 4);
break;
case 'L':
dir = (enum direction)((abs(4 + ((int)dir - (n / 90))) % 4));
break;
default:
break;
}
}
fclose(file);
return abs(ver) + abs(hor);
}
int main(int argc, char *argv[])
{
printf("%i\n", solve(argv[argc - 1]));
}
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