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#include "aoc.h"
namespace aoc2019 {
int parse_day1(line_view lv) {
int d{0};
const char* p = lv.line;
while (*p >= '0' && *p <= '9') {
d = d * 10 + *p - '0';
p++;
}
return d;
}
int day1(line_view file) {
int fuel{0};
auto cal = [](int m) -> int { return m / 3 - 2; };
per_line(file, [&fuel, &cal](line_view lv) {
fuel += cal(parse_day1(lv));
return true;
});
return fuel;
}
void add_fuel(int base, int* total) {
if (base > 0) {
// printf("%d\n", base);
*total += base;
add_fuel(base / 3 - 2, total);
}
}
int day1part2(line_view file) {
int fuel{0};
per_line(file, [&fuel](line_view lv) {
int total{0};
int base = parse_day1(lv);
add_fuel(base / 3 - 2, &total);
fuel += total;
return true;
});
return fuel;
}
} // namespace aoc2019
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