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‎cpp/11.cpp

+151
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,151 @@
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#include "common.h"
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#include <gmpxx.h>
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// I SOLVED THE PROBLEM BUT WAS TRYING TO BE AS FUNCTIONAL AS POSSIBLE BUT.. c++
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namespace {
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constexpr size_t MaxSize{1024};
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#define ASSERT_SCAN(expr, err) \
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if ((expr) == 0) \
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throw std::runtime_error((err));
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size_t play(long &worry, auto amplify, auto pacify, int test, size_t test_true,
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size_t test_false) {
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worry = amplify(worry);
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worry = pacify(worry);
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return ((worry % test) == 0) ? test_true : test_false;
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};
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struct Monkey {
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decltype(play) play;
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long inspects{};
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};
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// parse with input
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// send the mkys array
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// send the items array
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void parse(const auto &input, auto &mkys, auto &items) {
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using namespace std::placeholders;
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for (size_t i{0}; i < input.size(); i += 7) {
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size_t j = i / 7UL;
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auto &m = mkys[j];
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{
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std::istringstream ss{input[i + 1]};
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std::string s, _;
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ss >> _ >> _;
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while (ss >> s) {
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if (s[s.size() - 1] == ',')
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s.resize(s.size() - 1);
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long l{};
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std::from_chars(s.data(), s.data() + s.size(), l);
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items.emplace_back(std::make_tuple(j, l));
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}
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}
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char c;
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long w;
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auto scans = std::sscanf(input[i + 2].c_str(),
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" Operation: new = old %c %d", &c, &w);
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switch (c) {
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case '+':
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auto f = std::bind(std::plus{}, w, _1);
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m.play = std::bind(play, _1, f, _2, _3, _4, _5);
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break;
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case '*':
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if (scans != 2) {
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auto f = [](long worry) { return std::multiplies{}(worry, worry); };
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m.play = std::bind(play, _1, f, _2, _3, _4, _5)
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} else {
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auto f = std::bind(std::multiplies{}, w, _1);
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m.play = std::bind(play, _1, f, _2, _3, _4, _5)
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}
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default:
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throw std::runtime_error("unknow operator " + m.op);
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}
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int t;
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size_t tt, tf;
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ASSERT_SCAN(
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std::sscanf(input[i + 3].c_str(), " Test: divisible by %d", &t),
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"no test");
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ASSERT_SCAN(std::sscanf(input[i + 4].c_str(),
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" If true: throw to monkey %lu", &tt),
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"no true");
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ASSERT_SCAN(std::sscanf(input[i + 5].c_str(),
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" If false: throw to monkey %lu", &tf),
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"no false");
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std::bind(m.play, _1, _2, t, tt, tf);
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}
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}
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template <size_t N, size_t M> long p1(const auto &input) {
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std::array<Monkey, M> mkys{};
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std::vector<std::tuple<size_t, long>> items{};
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for (size_t i{0}; i < input.size(); i += 7) {
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size_t j = i / 7UL;
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Monkey &m = mkys[j];
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{
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std::istringstream ss{input[i + 1]};
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std::string s, _;
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ss >> _ >> _;
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while (ss >> s) {
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if (s[s.size() - 1] == ',')
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s.resize(s.size() - 1);
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long l{};
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std::from_chars(s.data(), s.data() + s.size(), l);
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items.emplace_back(std::make_tuple(j, l));
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}
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}
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if (std::sscanf(input[i + 2].c_str(), " Operation: new = old %c %d", &m.op,
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&m.wrry) != 2) {
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m.op = '^';
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}
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ASSERT_SCAN(
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std::sscanf(input[i + 3].c_str(), " Test: divisible by %d", &m.test),
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"no test");
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ASSERT_SCAN(std::sscanf(input[i + 4].c_str(),
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" If true: throw to monkey %lu", &m.test_true),
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"no true");
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ASSERT_SCAN(std::sscanf(input[i + 5].c_str(),
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" If false: throw to monkey %lu", &m.test_false),
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"no false");
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}
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for (size_t _ = 0; _ < N; ++_) {
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for (size_t i = 0; i < M; ++i) {
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auto &m = mkys[i];
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long ins{};
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for (auto &item :
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items | std::ranges::views::filter(
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[&i](const auto &it) { return std::get<0>(it) == i; })) {
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auto &w = std::get<1>(item);
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switch (m.op) {
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case '*':
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w *= m.wrry;
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break;
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case '+':
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w += m.wrry;
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break;
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case '^':
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w *= w;
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break;
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default:
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throw std::runtime_error("unknow operator " + m.op);
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}
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w %= (11 * 5 * 19 * 13 * 7 * 17 * 2 * 3);
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const auto &tgt = ((w % m.test) == 0) ? m.test_true : m.test_false;
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std::get<0>(item) = tgt;
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++ins;
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}
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m.inspects += ins;
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}
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}
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std::ranges::sort(mkys, std::ranges::greater(), &Monkey::inspects);
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return mkys[0].inspects * mkys[1].inspects;
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}
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} // namespace
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int main() {
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const auto &input = gb::advent2021::readIn();
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gb::advent2021::writeOut(std::to_string(p1<10000, 8>(input)));
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}

‎cpp/common.h

+17
Original file line numberDiff line numberDiff line change
@@ -9,6 +9,7 @@
99
#include <cstdio>
1010
#include <cstring>
1111
#include <deque>
12+
#include <fstream>
1213
#include <functional>
1314
#include <iostream>
1415
#include <iterator>
@@ -29,6 +30,22 @@
2930
using vs = std::vector<std::string>;
3031

3132
namespace gb::advent2021 {
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// Sad state of c++ where range based iteration with split_view is just
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// impossible to work in gcc 11.3
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std::vector<std::string_view> split(const std::string &sentence,
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const std::string &delim) {
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std::vector<std::string_view> vs{};
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size_t s{0}, e{0};
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auto it = sentence.begin();
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while ((e = sentence.find(delim, s)) != std::string::npos) {
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vs.emplace_back(std::string_view{it, std::next(it, (e - s))});
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std::advance(it, (e - s) + delim.size());
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s = e + delim.size();
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}
46+
return vs;
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}
48+
3249
std::vector<std::string> readIn() {
3350
std::vector<std::string> lines;
3451
for (std::string l; getline(std::cin, l);) {

‎cpp/meson.build

+6-4
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,6 @@
11
project('advent2022', 'cpp',
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version : '0.1',
3-
default_options : ['warning_level=3', 'cpp_std=c++20'])
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default_options : ['warning_level=3', 'cpp_std=c++2b'])
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executable('1',
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'1.cpp',
@@ -42,9 +42,11 @@ executable('10',
4242
'10.cpp',
4343
dependencies: [])
4444

45-
# executable('11',
46-
# '11.cpp',
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# dependencies: [])
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# gmp = dependency('gmp')
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executable('11',
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'11.cpp',
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# dependencies: [gmp])
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dependencies: [])
4850

4951
# executable('12',
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# '12.cpp',

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