commit 57a6036c30e6fc36f06cb5bb484ed6f8b51b1798
parent 79867afa0d53d9b19e1f9efe38184ebc16f15954
Author: bsandro <email@bsandro.tech>
Date: Thu, 5 Dec 2024 08:04:33 +0200
Day 05 p1+p2
Diffstat:
| A | day05/Makefile | | | 28 | ++++++++++++++++++++++++++++ |
| A | day05/input.txt | | | 1370 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | day05/main.cpp | | | 117 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | day05/test1.txt | | | 28 | ++++++++++++++++++++++++++++ |
4 files changed, 1543 insertions(+), 0 deletions(-)
diff --git a/day05/Makefile b/day05/Makefile
@@ -0,0 +1,28 @@
+NAME=$(shell basename ${PWD})
+SRC=$(wildcard *.cpp)
+DEPS:=$(wildcard *.hpp)
+OBJ:=$(SRC:.cpp=.o)
+CXXFLAGS=-O2 -std=c++17 -Werror -Wall -Wextra -I.
+LDFLAGS=-lstdc++
+
+all: $(NAME)
+
+.PHONY: clean run
+
+clean:
+ rm -f $(OBJ) $(NAME)
+
+%.o : %.c $(DEPS)
+ @$(CC) $(CFLAGS) -c $< -o $@
+
+$(NAME): $(OBJ)
+ @$(CC) $(OBJ) -o $@ $(LDFLAGS)
+
+run: $(NAME)
+ @./$(NAME) input.txt
+
+test1: $(NAME)
+ @./$(NAME) test1.txt
+
+test2: $(NAME)
+ @./$(NAME) test2.txt
diff --git a/day05/input.txt b/day05/input.txt
@@ -0,0 +1,1370 @@
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diff --git a/day05/main.cpp b/day05/main.cpp
@@ -0,0 +1,117 @@
+#include <iostream>
+#include <filesystem>
+#include <fstream>
+#include <vector>
+#include <cstring>
+#include <cstdio>
+#include <tuple>
+#include <algorithm>
+
+typedef std::pair<int,int> Rule;
+typedef std::vector<Rule> Rules;
+
+struct Update {
+ std::vector<int> data;
+ bool check(const Rules &rules) {
+ for (auto it1=data.begin(); it1!=data.end();++it1) {
+ for (auto it2=it1; it2!=data.end();++it2) {
+ for (auto &r : rules) {
+ if (r.first==*it2&&r.second==*it1) {
+ //printf("%d,%d failed (rule %d,%d)\n", d1,d2,r.first,r.second);
+ return false;
+ }
+ }
+ }
+ }
+ return true;
+ }
+ bool checkfix(const Rules &rules) {
+ bool fixed = false;
+ for (auto it1=data.begin(); it1!=data.end();++it1) {
+ for (auto it2=it1; it2!=data.end();++it2) {
+ for (auto &r : rules) {
+ if (r.first==*it2&&r.second==*it1) {
+ //printf("%d,%d failed (rule %d,%d)\n", d1,d2,r.first,r.second);
+ std::iter_swap(it1, it2);
+ fixed = true;
+ }
+ }
+ }
+ }
+ return fixed;
+ }
+ int middle() {
+ return data[data.size()/2];
+ }
+ void print() {
+ for (int d : data) {
+ std::cout << "[" << d << "]";
+ }
+ }
+};
+
+struct Game {
+ Rules rules;
+ std::vector<Update> updates;
+};
+
+Game read_file(const std::string &path) {
+ std::ifstream ifs(path, std::ios::binary);
+ if (!ifs.is_open()) {
+ throw std::runtime_error(path+":"+std::strerror(errno));
+ }
+ Game g;
+ bool is_rules = true;
+ while (1) {
+ std::string str;
+ std::getline(ifs, str);
+ if (!ifs) break;
+ if (str.empty()) {
+ is_rules = false;
+ continue;
+ }
+ if (is_rules) {
+ int a,b;
+ std::sscanf(str.c_str(), "%d|%d", &a, &b);
+ g.rules.push_back(std::make_pair(a, b));
+ } else {
+ std::istringstream ss(str);
+ Update u;
+ for (std::string s; std::getline(ss, s, ',');) {
+ u.data.push_back(std::stoi(s));
+ }
+ g.updates.push_back(u);
+ }
+ }
+ return g;
+}
+
+int part1(Game &g) {
+ int r = 0;
+ for (auto &u : g.updates) {
+ if (u.check(g.rules)) {
+ r+=u.middle();
+ }
+ }
+ return r;
+}
+int part2(Game &g) {
+ (void)g;
+ int r = 0;
+ for (auto &u : g.updates) {
+ if (u.checkfix(g.rules)) {
+ r+=u.middle();
+ }
+ }
+ return r;
+}
+
+int main(int argc, char **argv) {
+ const std::string fname = argc>1 ? argv[1] : "test1.txt";
+ std::cout << "AoC 2015 day 05 " << fname << std::endl;
+ Game game = read_file(fname);
+ std::cout << "part1: " << part1(game) << std::endl;
+ std::cout << "part2: " << part2(game) << std::endl;
+
+ return 0;
+}
diff --git a/day05/test1.txt b/day05/test1.txt
@@ -0,0 +1,28 @@
+47|53
+97|13
+97|61
+97|47
+75|29
+61|13
+75|53
+29|13
+97|29
+53|29
+61|53
+97|53
+61|29
+47|13
+75|47
+97|75
+47|61
+75|61
+47|29
+75|13
+53|13
+
+75,47,61,53,29
+97,61,53,29,13
+75,29,13
+75,97,47,61,53
+61,13,29
+97,13,75,29,47
