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Improved task 218 #791

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Merged
merged 2 commits into from
Mar 29, 2025
Merged

Improved task 218 #791

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bbf5918
Improved task 218
javadev Mar 29, 2025
f469234
Fixed format
javadev Mar 29, 2025
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17 changes: 7 additions & 10 deletions src/main/kotlin/g0201_0300/s0218_the_skyline_problem/Solution.kt
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
package g0201_0300.s0218_the_skyline_problem

// #Hard #Array #Heap_Priority_Queue #Ordered_Set #Divide_and_Conquer #Segment_Tree
// #Binary_Indexed_Tree #Line_Sweep #2022_10_25_Time_365_ms_(93.14%)_Space_45.7_MB_(93.71%)
// #Binary_Indexed_Tree #Line_Sweep #2025_03_29_Time_50_ms_(100.00%)_Space_63.12_MB_(10.53%)

import java.util.TreeMap

Expand All @@ -12,21 +12,18 @@ class Solution {
return ans
}
val totalBuildings = blds.size
val buildings = Array<Building?>(totalBuildings * 2) { null }
var idx = 0
for (building in blds) {
buildings[idx] = Building(building[0], building[2], true)
buildings[idx + 1] = Building(building[1], building[2], false)
idx += 2
val buildings = Array(totalBuildings * 2) { i ->
if (i % 2 == 0) {
Building(blds[i / 2][0], blds[i / 2][2], true)
} else {
Building(blds[i / 2][1], blds[i / 2][2], false)
}
}
buildings.sort()
val skyline = TreeMap<Int, Int>()
skyline[0] = 1
var prevMaxHeight = 0
for (building in buildings) {
if (building == null) {
continue
}
val height = building.height
if (building.isStart) {
skyline[height] = 1 + (skyline[height] ?: 0)
Expand Down