83 lines
1.6 KiB
C
83 lines
1.6 KiB
C
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <limits.h>
|
|
|
|
// cubes, R, G, B
|
|
const int cubes[3] = {12, 13, 14};
|
|
const char *colors[] = {"red", "green", "blue"};
|
|
|
|
int getCubes(char *ptr);
|
|
|
|
int main ()
|
|
{
|
|
int gameID = 0;
|
|
int gameSum = 0;
|
|
char row[160];
|
|
char *ptr;
|
|
int length = 0;
|
|
int gameCubes[3] = {0, 0, 0};
|
|
int gameHands = 0;
|
|
int offset = 0;
|
|
|
|
|
|
FILE *input;
|
|
input = fopen("./input", "r");
|
|
nextGame:
|
|
// for each row
|
|
while(fgets(row, 160, input) != NULL) {
|
|
// increment game count
|
|
gameID++;
|
|
gameHands = 1;
|
|
offset = 0;
|
|
for (int i = 0; i < 3; i++) gameCubes[i] = 0;
|
|
|
|
// change each ; to \0
|
|
while(ptr = strchr(ptr, ';')) {
|
|
ptr[0] = '\0';
|
|
gameHands++;
|
|
ptr++;
|
|
}
|
|
|
|
// for each 'hand' (semicolon) ((NULL-char))
|
|
for(gameHands; gameHands > 0; gameHands--) {
|
|
// for each color
|
|
for(int i = 0; i < 3; i++) {
|
|
// use strstr to find color,
|
|
// move pointer to the beginning of said colour
|
|
ptr = strstr(row + offset, colors[i]);
|
|
// if (strstr(row, colors[i]) != NULL)
|
|
if (ptr != NULL)
|
|
gameCubes[i] = getCubes(ptr);
|
|
// higher than colors[i]? jump to next game
|
|
if (gameCubes[i] > cubes[i]) {
|
|
goto nextGame;
|
|
}
|
|
}
|
|
// pointer = strstr \0 + 1
|
|
offset += strlen(&row[offset]) + 1;
|
|
ptr = row + offset;
|
|
}
|
|
// hit \n? add game ID to sum
|
|
printf("Game %d valid\n", gameID);
|
|
gameSum += gameID;
|
|
}
|
|
|
|
printf("Game ID sum: %d\n", gameSum);
|
|
}
|
|
|
|
int getCubes(char *ptr)
|
|
{
|
|
int num = 0;
|
|
|
|
// get two chars: pointer -3, pointer -2
|
|
// convert them to an int
|
|
if (ptr[-3] >= '0' && ptr[-3] <= '9') {
|
|
num += (ptr[-3] - '0') * 10;
|
|
}
|
|
if (ptr[-2] >= '0' && ptr[-2] <= '9') {
|
|
num += ptr[-2] - '0';
|
|
}
|
|
|
|
return num;
|
|
}
|