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Reuse general intcode implementation.

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Bert Peters
2019-12-05 18:19:26 +01:00
parent c62bcf010f
commit 0bf29b1e42
1 changed files with 5 additions and 33 deletions
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38
2019/src/day02.cpp
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@@ -1,52 +1,24 @@
#include <cstdio>
#include <exception> #include <exception>
#include <iostream> #include <iostream>
#include <array> #include <array>
#include <vector> #include <vector>
#include "days.hpp" #include "days.hpp"
#include "utils.hpp"
static std::vector<int> read_program(std::istream &input) {
std::vector<int> program{};
for (int current; input >> current; input.ignore()) {
program.push_back(current);
}
return program;
}
static int run_program(std::vector<int> program) { static int run_program(std::vector<int> program) {
for (int ip = 0; ip < program.size(); ip += 4) { aoc2019::run_intcode(program);
switch (program[ip]) { return program[0];
case 1:
program[program[ip + 3]] = program[program[ip + 1]] + program[program[ip + 2]];
break;
case 2:
program[program[ip + 3]] = program[program[ip + 1]] * program[program[ip + 2]];
break;
case 99:
return program[0];
default:
char buffer[30];
std::snprintf(buffer, sizeof(buffer), "Invalid opcode: %d", program[ip]);
throw std::domain_error(buffer);
}
}
throw std::out_of_range("Program read out of bounds");
} }
void aoc2019::day02_part1(std::istream &input, std::ostream &output) { void aoc2019::day02_part1(std::istream &input, std::ostream &output) {
auto program = read_program(input); auto program = read_intcode(input);
program[1] = 12; program[1] = 12;
program[2] = 2; program[2] = 2;
output << run_program(std::move(program)) << std::endl; output << run_program(std::move(program)) << std::endl;
} }
void aoc2019::day02_part2(std::istream &input, std::ostream &output) { void aoc2019::day02_part2(std::istream &input, std::ostream &output) {
auto program = read_program(input); auto program = read_intcode(input);
for (int noun = 0; noun < 100; ++noun) { for (int noun = 0; noun < 100; ++noun) {
for (int verb = 0; verb < 100; ++verb) { for (int verb = 0; verb < 100; ++verb) {