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advent-of-code-2020
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Remove unneeded midle copy from rotation code in day 20

master
Nick Krichevsky 2020-12-24 19:08:26 -05:00
parent c9d3c6207f
commit 529af585fd
1 changed files with 1 additions and 9 deletions
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10
day20/day20.cpp
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@ -125,7 +125,7 @@ class CameraFrame {
std::vector<std::string> rotatedFrame(this->frame.size(), std::string(this->frame.at(0).size(), ' '));
int ringStartIndex = 0;
int ringEndIndex = this->frame.size() - 1;
while (ringStartIndex < ringEndIndex) {
while (ringStartIndex <= ringEndIndex) {
// Top Edge -> Right Edge
for (int i = ringStartIndex; i <= ringEndIndex; i++) {
rotatedFrame.at(i).at(ringEndIndex) = frame.at(ringStartIndex).at(i);
@ -150,14 +150,6 @@ class CameraFrame {
ringEndIndex--;
}
// Copy over the middle
// Without this if, this overwrites legit rotated tiles when filling in the middle, if we have a board of an
// even number size
if (this->frame.size() % 2 != 0) {
auto middle = this->frame.size() / 2;
rotatedFrame.at(middle).at(middle) = frame.at(middle).at(middle);
}
this->frame = std::move(rotatedFrame);
}