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#include "aoc.h"
#include <map>
namespace aoc2015 {
house move_day3(house h, dir d) {
house n = h;
switch (d) {
case dir::up:
n.y += 1;
break;
case dir::down:
n.y -= 1;
break;
case dir::left:
n.x -= 1;
break;
case dir::right:
n.x += 1;
break;
}
return n;
}
std::pair<size_t, size_t> day3(line_view lv) {
house h{0, 0};
house h1{0, 0};
house h2{0, 0};
std::map<house, size_t> m1{{h, 1}};
std::map<house, size_t> m2{{h, 1}};
house* hs[] = {&h1, &h2};
for (size_t i = 0; i < lv.length; i++) {
int x = i % 2;
switch (lv.line[i]) {
case '^':
h = move_day3(h, dir::up);
*hs[x] = move_day3(*hs[x], dir::up);
break;
case 'v':
h = move_day3(h, dir::down);
*hs[x] = move_day3(*hs[x], dir::down);
break;
case '>':
h = move_day3(h, dir::right);
*hs[x] = move_day3(*hs[x], dir::right);
break;
case '<':
h = move_day3(h, dir::left);
*hs[x] = move_day3(*hs[x], dir::left);
break;
default:
break;
}
m1.insert({h, 1});
m2.insert({*hs[x], 1});
}
return {m1.size(), m2.size()};
}
} // namespace aoc2015
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