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#include "aoc.h"
#include <vector>
namespace aoc2020 {
static int run(size_t index, std::vector<code> cs, int* accumlator) {
if (index < cs.size()) {
auto& code = cs[index];
if (code.executed == 0) {
size_t next = index + 1;
if (code.type == acc) {
*accumlator += code.value;
}
if (code.type == jmp) {
next = index + code.value;
}
code.executed += 1;
return run(next, cs, accumlator);
}
return 1;
}
return 0;
}
std::pair<int, int> day8(line_view file) {
std::vector<code> cs;
int acc0 = 0;
per_line(file, [&cs](line_view lv) {
cs.emplace_back(lv);
return true;
});
run(0, cs, &acc0);
auto reset = [](code& c) {
c.type = (code_t)(!(int)c.type);
};
int acc1 = 0;
for(auto& code: cs) {
if (code.type != acc) {
reset(code);
acc1 = 0;
if (run(0, cs, &acc1) == 0) {
break;
}
reset(code);
}
}
return {acc0, acc1};
}
} // namespace aoc2020
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