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#include "aoc.h"
#include <set>
namespace aoc2018 {
int parse_day1(line_view lv) {
const char* p = lv.line;
int sign = *p++ == '+' ? 1 : -1;
int s{0};
while (*p >= '0' && *p <= '9') {
s = s * 10 + *p - '0';
p++;
}
return sign * s;
}
int day1(line_view file) {
int sum{0};
per_line(file, [&sum](line_view lv) {
sum += parse_day1(lv);
return true;
});
return sum;
}
int day1part2(line_view file) {
std::set<int> frequencies;
int f{0};
bool found{false};
while (!found) {
per_line(file, [&f, &frequencies, &found](line_view lv) {
f += parse_day1(lv);
// printf("%d\n", f);
auto p = frequencies.insert(f);
found = !p.second;
return p.second;
});
}
return f;
}
} // namespace aoc2018
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