diff options
Diffstat (limited to 'datastructures')
| -rw-r--r-- | datastructures/unionFind.cpp | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/datastructures/unionFind.cpp b/datastructures/unionFind.cpp index 35843cd..68eef86 100644 --- a/datastructures/unionFind.cpp +++ b/datastructures/unionFind.cpp @@ -1,5 +1,5 @@ // unions[i] >= 0 => unions[i] = parent -// unions[i] < 0 => unions[i] = -height +// unions[i] < 0 => unions[i] = -size vector<int> unions; void init(int n) { //Initialisieren @@ -11,12 +11,16 @@ int findSet(int n) { // Pfadkompression return unions[n] = findSet(unions[n]); } -void linkSets(int a, int b) { // Union by rank. +void linkSets(int a, int b) { // Union by size. if (unions[b] > unions[a]) swap(a, b); - if (unions[b] == unions[a]) unions[b]--; + unions[b] += unions[a]; unions[a] = b; } void unionSets(int a, int b) { // Diese Funktion aufrufen. if (findSet(a) != findSet(b)) linkSets(findSet(a), findSet(b)); } + +int size(int a) { + return -unions[findSet(a)]; +} |