C Day 3 (Part 1 only)
Signed-off-by: Tobias Berger <tobi.berger13@gmail.com>
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5 changed files with 1140 additions and 3 deletions
2
.vscode/launch.json
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2
.vscode/launch.json
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@ -5,7 +5,7 @@
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"name": "(gdb) Start",
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"type": "cppdbg",
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"request": "launch",
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"program": "${workspaceFolder}/c/day2.exe",
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"program": "${workspaceFolder}/c/day3.exe",
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"args": [],
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"stopAtEntry": false,
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"cwd": "${workspaceFolder}/c/",
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17
.vscode/tasks.json
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.vscode/tasks.json
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{
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"version": "2.0.0",
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"tasks": [
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{
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"type": "shell",
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"label": "Run build script",
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"command": "./build-all.ps1",
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"options": {
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"cwd": "${workspaceFolder}/c/"
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},
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"group": {
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"kind": "build",
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"isDefault": true
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},
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}
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]
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}
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5
c/build-all.ps1
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5
c/build-all.ps1
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@ -1,2 +1,3 @@
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gcc day1/*.c -o day1.exe -Og -g -Wall -Werror -std=c17
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gcc day2/*.c -o day2.exe -Og -g -Wall -Werror -std=c17
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# gcc day1/*.c -o day1.exe -Og -g -Wall -Werror -std=c17
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# gcc day2/*.c -o day2.exe -Og -g -Wall -Werror -std=c17
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gcc day3/*.c -o day3.exe -Og -g -Wall -Werror -std=c17
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1000
c/day3/input.txt
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1000
c/day3/input.txt
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File diff suppressed because it is too large
Load diff
119
c/day3/main.c
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119
c/day3/main.c
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// https://adventofcode.com/2021/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define DAY 3
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#define INPUT_LENGTH 1000
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#define INPUT_BIT_SIZE 12
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unsigned int parsedInput[INPUT_LENGTH];
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void parseInput(char *const input)
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{
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char const *curLine = input;
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unsigned int lineNum = 0;
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while (lineNum < INPUT_LENGTH)
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{
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char const *nextLine = strchr(curLine, '\n');
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int curLineLen = nextLine ? nextLine - curLine : strlen(curLine);
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char *const tempStr = malloc(curLineLen + 1);
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memcpy(tempStr, curLine, curLineLen);
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tempStr[curLineLen] = '\0';
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parsedInput[lineNum] = strtol(tempStr, NULL, 2);
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free(tempStr);
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curLine = nextLine ? nextLine + 1 : NULL;
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lineNum++;
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}
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}
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char const *const part1()
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{
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unsigned int ones[INPUT_BIT_SIZE] = {0};
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for (unsigned int input_i = 0; input_i < INPUT_LENGTH; input_i++)
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{
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for (unsigned char i = 0; i < INPUT_BIT_SIZE; i++)
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{
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ones[i] += (parsedInput[input_i] >> i) & 1;
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}
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}
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char gammaStr[INPUT_BIT_SIZE + 1];
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sprintf(gammaStr, "%c%c%c%c%c%c%c%c%c%c%c%c",
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ones[INPUT_BIT_SIZE - 1] > INPUT_LENGTH / 2 ? '1' : '0',
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ones[INPUT_BIT_SIZE - 2] > INPUT_LENGTH / 2 ? '1' : '0',
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ones[INPUT_BIT_SIZE - 3] > INPUT_LENGTH / 2 ? '1' : '0',
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ones[INPUT_BIT_SIZE - 4] > INPUT_LENGTH / 2 ? '1' : '0',
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ones[INPUT_BIT_SIZE - 5] > INPUT_LENGTH / 2 ? '1' : '0',
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ones[INPUT_BIT_SIZE - 6] > INPUT_LENGTH / 2 ? '1' : '0',
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ones[INPUT_BIT_SIZE - 7] > INPUT_LENGTH / 2 ? '1' : '0',
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ones[INPUT_BIT_SIZE - 8] > INPUT_LENGTH / 2 ? '1' : '0',
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ones[INPUT_BIT_SIZE - 9] > INPUT_LENGTH / 2 ? '1' : '0',
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ones[INPUT_BIT_SIZE - 10] > INPUT_LENGTH / 2 ? '1' : '0',
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ones[INPUT_BIT_SIZE - 11] > INPUT_LENGTH / 2 ? '1' : '0',
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ones[INPUT_BIT_SIZE - 12] > INPUT_LENGTH / 2 ? '1' : '0');
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char epsilonStr[INPUT_BIT_SIZE + 1];
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sprintf(epsilonStr, "%c%c%c%c%c%c%c%c%c%c%c%c",
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ones[INPUT_BIT_SIZE - 1] > INPUT_LENGTH / 2 ? '0' : '1',
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ones[INPUT_BIT_SIZE - 2] > INPUT_LENGTH / 2 ? '0' : '1',
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ones[INPUT_BIT_SIZE - 3] > INPUT_LENGTH / 2 ? '0' : '1',
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ones[INPUT_BIT_SIZE - 4] > INPUT_LENGTH / 2 ? '0' : '1',
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ones[INPUT_BIT_SIZE - 5] > INPUT_LENGTH / 2 ? '0' : '1',
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ones[INPUT_BIT_SIZE - 6] > INPUT_LENGTH / 2 ? '0' : '1',
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ones[INPUT_BIT_SIZE - 7] > INPUT_LENGTH / 2 ? '0' : '1',
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ones[INPUT_BIT_SIZE - 8] > INPUT_LENGTH / 2 ? '0' : '1',
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ones[INPUT_BIT_SIZE - 9] > INPUT_LENGTH / 2 ? '0' : '1',
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ones[INPUT_BIT_SIZE - 10] > INPUT_LENGTH / 2 ? '0' : '1',
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ones[INPUT_BIT_SIZE - 11] > INPUT_LENGTH / 2 ? '0' : '1',
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ones[INPUT_BIT_SIZE - 12] > INPUT_LENGTH / 2 ? '0' : '1');
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long int gamma = strtol(gammaStr, NULL, 2);
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long int epsilon = strtol(epsilonStr, NULL, 2);
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char *const result = malloc(32);
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sprintf(result, "%ld", gamma * epsilon);
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return result;
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};
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char const *const part2()
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{
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return "UNSOLVED";
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};
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int main(void)
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{
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char *const fileName = malloc(sizeof(char) * sizeof("dayXX/input.txt"));
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sprintf(fileName, "day%d/input.txt", DAY);
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FILE *inputFile = fopen(fileName, "r");
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if (inputFile == NULL)
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{
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printf("Failed to open input file %s.\n", fileName);
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return 1;
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}
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fseek(inputFile, 0, SEEK_END);
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long length = ftell(inputFile);
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fseek(inputFile, 0, SEEK_SET);
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char *const input = malloc(length);
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if (input != NULL)
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{
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fread(input, 1, length, inputFile);
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}
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fclose(inputFile);
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parseInput(input);
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printf("Day %d\n", DAY);
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printf("Part 1:\n%s\n", part1());
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printf("--------------\n");
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printf("Part 2:\n%s\n\n", part2());
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return 0;
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}
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