106 lines
2.4 KiB
Text
106 lines
2.4 KiB
Text
#include <stdio.h>
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#include <string.h>
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#include <limits.h>
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#define MAX_GAMES 101
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// cubes, R, G, B
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const int cubes[3] = {12, 13, 14};
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const char *colors[] = {"red", "green", "blue"};
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int getCubes(char *ptr);
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int main ()
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{
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int gameID = 0;
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int gameSum = 0;
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char row[160];
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char *ptr;
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int length = 0;
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int gameCubes[3] = {0, 0, 0};
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int gameHands = 0;
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int offset = 0;
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int game[MAX_GAMES] = {0};
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for (int i = 1; i < MAX_GAMES; i++)
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game[i] = i;
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int powerSum = 0;
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FILE *input;
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input = fopen("./input", "r");
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// for each row
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while(fgets(row, 160, input) != NULL) {
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// increment game count
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gameID++;
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gameHands = 1;
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offset = 0;
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for (int i = 0; i < 3; i++) gameCubes[i] = 0;
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printf("%s\n", row);
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// not neccesary to decide length when we know amount of ';'?
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// length = strchr(row, '\n') - &row[0];
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// change each ; to \0
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ptr = row;
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while(ptr = strchr(ptr, ';')) {
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ptr[0] = '\0';
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gameHands++;
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ptr++;
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}
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printf("\nGame %d hands: %d\n", gameID, gameHands);
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// for each 'hand' (semicolon) ((NULL-char))
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for(gameHands; gameHands > 0; gameHands--) {
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printf("%s\n", row + offset);
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// for each color
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for(int i = 0; i < 3; i++) {
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// use strstr to find color,
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// move pointer to the beginning of said colour
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ptr = strstr(row + offset, colors[i]);
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// if (strstr(row, colors[i]) != NULL)
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if (ptr != NULL) {
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if (gameCubes[i] < getCubes(ptr))
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gameCubes[i] = getCubes(ptr);
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}
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// higher than colors[i]? invalidate the game
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if (gameCubes[i] > cubes[i]) {
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game[gameID] = 0;
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// printf("Game %d invalid\n", gameID);
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}
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}
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// pointer = strstr \0 + 1
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offset += strlen(&row[offset]) + 1;
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ptr = row + offset;
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}
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// printf("Game %d required RGB: %d, %d, %d\n",
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// gameID, gameCubes[0],gameCubes[1],gameCubes[2]
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// );
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powerSum += gameCubes[0] * gameCubes[1] * gameCubes[2];
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printf("Game %d powersum: %d\nCurrent Total: %d\n", gameID, gameCubes[0] * gameCubes[1] * gameCubes[2], powerSum);
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}
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for (int i = gameID + 1; i < MAX_GAMES; i++)
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game[i] = 0;
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for (int i = 0; i < MAX_GAMES; i++) {
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gameSum += game[i];
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}
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printf("Game ID sum: %d\n", gameSum);
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printf("Total power sum: %d\n", powerSum);
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}
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int getCubes(char *ptr)
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{
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int num = 0;
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// get two chars: pointer -3, pointer -2
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// convert them to an int
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if (ptr[-3] >= '0' && ptr[-3] <= '9') {
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num += (ptr[-3] - '0') * 10;
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}
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if (ptr[-2] >= '0' && ptr[-2] <= '9') {
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num += ptr[-2] - '0';
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}
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return num;
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}
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