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AOC2023: Remove unnecessary loop

This commit is contained in:
Bananymous 2023-12-10 20:18:59 +02:00
parent 00d57d783e
commit 58633ca373
1 changed files with 9 additions and 16 deletions
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25
userspace/aoc2023/day10/main.cpp
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@ -202,7 +202,7 @@ i64 puzzle2(FILE* fp)
{ {
for (u32& tile : row) for (u32& tile : row)
{ {
// Remove left and right from path // Remove left and right from path tiles
if (tile & Flag::Path) if (tile & Flag::Path)
tile &= ~(Flag::Left | Flag::Right); tile &= ~(Flag::Left | Flag::Right);
// Tile should never be both left and right // Tile should never be both left and right
@ -227,23 +227,16 @@ i64 puzzle2(FILE* fp)
} }
ASSERT(enclosed != Flag::Path); ASSERT(enclosed != Flag::Path);
// Expand all enclosed areas // Expand all enclosed areas (only one pass is needed since exery area
bool modified = true; // is fully bordered by enclosed tiles)
while (modified) for (size_t y = 1; y < grid.size(); y++)
{ {
modified = false; for (size_t x = 1; x < grid[y].size(); x++)
for (size_t y = 1; y < grid.size(); y++)
{ {
for (size_t x = 1; x < grid[y].size(); x++) if (grid[y][x] & Flag::Mask)
{ continue;
if (grid[y][x] & Flag::Mask) if ((grid[y - 1][x] & enclosed) || (grid[y][x - 1] & enclosed))
continue; grid[y][x] |= enclosed;
if ((grid[y - 1][x] & enclosed) || (grid[y][x - 1] & enclosed))
{
grid[y][x] |= enclosed;
modified = true;
}
}
} }
} }