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advent-of-code-2020
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Minor cleanup of day 24

master
Nick Krichevsky 2020-12-27 21:57:27 -05:00
parent 30bf0251bc
commit aa924e801d
1 changed files with 1 additions and 4 deletions
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5
day24/day24.cpp
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@ -151,8 +151,6 @@ int part2(const std::vector<std::vector<Direction>> &input) {
} }
} }
next.clear();
for (auto &entry : flipped) { for (auto &entry : flipped) {
auto neighbors = getNeighbors(entry.first); auto neighbors = getNeighbors(entry.first);
int numFlippedNeighbors = int numFlippedNeighbors =
@ -164,12 +162,11 @@ int part2(const std::vector<std::vector<Direction>> &input) {
bool nextState = entry.second; bool nextState = entry.second;
if (entry.second && (numFlippedNeighbors == 0 || numFlippedNeighbors > 2)) { if (entry.second && (numFlippedNeighbors == 0 || numFlippedNeighbors > 2)) {
nextState = false; nextState = false;
next.emplace(entry.first, false);
} else if (!entry.second && numFlippedNeighbors == 2) { } else if (!entry.second && numFlippedNeighbors == 2) {
nextState = true; nextState = true;
} }
next.emplace(entry.first, nextState); next[entry.first] = nextState;
} }
std::swap(flipped, next); std::swap(flipped, next);