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authorPaul Jungeblut <paul.jungeblut@gmail.com>2016-10-02 18:49:19 +0200
committerPaul Jungeblut <paul.jungeblut@gmail.com>2016-10-02 18:49:19 +0200
commit0ab75cddde1c959fe434c6554f1d3e1ed2719780 (patch)
tree9cf1d5f5a46ec60edf65c8a8b002ece7d89bf89e /datastructures/RMQ.cpp
parent3ef01f79baa2dd8c391e31c2a6fd02b97cdb75ec (diff)
Optical improvements of the datastructures section.
Diffstat (limited to 'datastructures/RMQ.cpp')
-rw-r--r--datastructures/RMQ.cpp11
1 files changed, 4 insertions, 7 deletions
diff --git a/datastructures/RMQ.cpp b/datastructures/RMQ.cpp
index 3c3f44c..8e6a33f 100644
--- a/datastructures/RMQ.cpp
+++ b/datastructures/RMQ.cpp
@@ -1,7 +1,7 @@
vector<int> data(RMQ_SIZE);
vector<vector<int>> rmq(floor(log2(RMQ_SIZE)) + 1, vector<int>(RMQ_SIZE));
-//Runtime: O(n*log(n))
+// Baut Struktur auf. O(n*log(n))
void initRMQ() {
for(int i = 0, s = 1, ss = 1; s <= RMQ_SIZE; ss=s, s*=2, i++) {
for(int l = 0; l + s <= RMQ_SIZE; l++) {
@@ -9,12 +9,9 @@ void initRMQ() {
else {
int r = l + ss;
rmq[i][l] = (data[rmq[i-1][l]] <= data[rmq[i-1][r]] ? rmq[i-1][l] : rmq[i-1][r]);
- }
- }
- }
-}
-//returns index of minimum! [l, r)
-//Runtime: O(1)
+}}}}
+
+// Gibt den Index des Minimums im Intervall [l,r) zurück. O(1).
int queryRMQ(int l, int r) {
if(l >= r) return l;
int s = floor(log2(r-l)); r = r - (1 << s);