/
ch-2.kt
66 lines (63 loc) · 1.52 KB
/
ch-2.kt
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fun widestvalley(a: List<Int>): List<Int> {
var av = ArrayList<Int>()
var ac = ArrayList<Int>()
var l = -1
for (v in a) {
if (v == l) {
ac[ac.size - 1] += 1
} else {
av.add(v)
ac.add(1)
l = v
}
}
var s = ArrayList<Int>()
var e = ArrayList<Int>()
var c = 0
for (i in 0 .. av.size-1) {
if (i == 0 || i == av.size - 1 || (av[i - 1] < av[i] && av[i] > av[i + 1])) {
s.add(c)
e.add(c + ac[i] - 1)
}
c += ac[i]
}
var out = emptyList<Int>()
for (i in 0 .. s.size - 2) {
if (e[i + 1] - s[i] + 1 > out.size) {
out = a.slice(s[i] .. e[i + 1]).toList()
}
}
return out
}
fun main() {
if (widestvalley(listOf(1, 5, 5, 2, 8)) == listOf(5, 5, 2, 8)) {
print("Pass")
} else {
print("Fail")
}
print(" ")
if (widestvalley(listOf(2, 6, 8, 5)) == listOf(2, 6, 8)) {
print("Pass")
} else {
print("Fail")
}
print(" ")
if (widestvalley(listOf(9, 8, 13, 13, 2, 2, 15, 17)) == listOf(13, 13, 2, 2, 15, 17)) {
print("Pass")
} else {
print("Fail")
}
print(" ")
if (widestvalley(listOf(2, 1, 2, 1, 3)) == listOf(2, 1, 2)) {
print("Pass")
} else {
print("Fail")
}
print(" ")
if (widestvalley(listOf(1, 3, 3, 2, 1, 2, 3, 3, 2)) == listOf(3, 3, 2, 1, 2, 3, 3)) {
print("Pass")
} else {
print("Fail")
}
println("")
}