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SegTree fix for custom join #5

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SegTree fix for custom join #5

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12 changes: 6 additions & 6 deletions Library/Data Structures/SegTree.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -4,13 +4,13 @@ using namespace std;
template<typename T> struct SegTree {
vector<T> seg;
int N;
T NEUTRO = 0;
SegTree(int n) : N(n) { seg.assign(4*n, NEUTRO); }
SegTree(vector<T> &lista) : N(lista.size()) { seg.assign(4*N); build(1, 0, N-1, lista); }
T IDENTITY = T();
SegTree(int n) : N(n) { seg.assign(4*n, IDENTITY); }
SegTree(vector<T> &lista) : N(lista.size()) { seg.assign(4*N, IDENTITY); build(1, 0, N-1, lista); }
T join(T lv, T rv){ return lv + rv; }

T query(int no, int l, int r, int a, int b){
if(b < l || r < a) return NEUTRO;
if(b < l || r < a) return IDENTITY;
if(a <= l && r <= b) return seg[no];
int m=(l+r)/2, e=no*2, d=e+1;

Expand Down Expand Up @@ -48,5 +48,5 @@ template<typename T> struct SegTree {
Build: O(N)
Query: O(log N) | seg.query(l, r);
Update: O(log N) | seg.update(i, v);
**Update Join, NEUTRO and Update if needed**
***************************LATEX_IGNORED_END*/
**Update Join, IDENTITY and Update if needed**
***************************LATEX_IGNORED_END*/