73 lines
1.5 KiB
C++
73 lines
1.5 KiB
C++
#include <algorithm>
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#include <array>
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#include <cassert>
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#include <iostream>
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#include <list>
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#include <map>
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#include <regex>
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#include <string>
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using Data = std::uint64_t;
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using Mem = std::vector<Data>;
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struct Computer
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{
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Computer() : set_(0), clear_(0), mem_() {}
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void add_instruction(std::string const& s)
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{
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static const std::regex re("mem\\[(\\d+)\\] = (\\d+)");
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std::smatch m;
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if (s.substr(0, 4) == "mask") {
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set_ = 0;
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clear_ = 0;
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for (auto c : s.substr(7)) {
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set_ <<= 1;
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clear_ <<= 1;
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set_ |= (c == '1');
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clear_ |= (c != '0');
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}
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std::cout << "mask set: " << std::hex << set_ << "\n";
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std::cout << "mask clear: " << std::hex << clear_ << "\n";
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}
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else if (std::regex_search(s, m, re)) {
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Data loc = std::stoul(m.str(1));
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Data value = std::stoul(m.str(2));
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std::cout << "mem[" << std::dec << loc << " = (" << value << " | " << set_ << ") & " << clear_
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<< " = ";
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value = (value | set_) & clear_;
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std::cout << value << "\n";
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if (mem_.size() <= loc) {
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mem_.resize(loc + 1, 0);
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}
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mem_[loc] = value;
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}
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}
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Data mem_sum() const noexcept
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{
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Data r = 0;
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for (auto v : mem_) {
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r += v;
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}
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return r;
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}
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Data set_;
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Data clear_;
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Mem mem_;
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};
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int main(int argc, char** argv)
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{
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Computer c;
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std::string line;
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while (std::getline(std::cin, line)) {
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c.add_instruction(line);
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}
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std::cout << "Memory sum: " << std::dec << c.mem_sum() << "\n";
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return 0;
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} |