diff options
Diffstat (limited to 'datastructures/fenwickTree2.cpp')
| -rw-r--r-- | datastructures/fenwickTree2.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/datastructures/fenwickTree2.cpp b/datastructures/fenwickTree2.cpp index 086e785..7fcdbb9 100644 --- a/datastructures/fenwickTree2.cpp +++ b/datastructures/fenwickTree2.cpp @@ -7,7 +7,7 @@ void update(int l, int r, ll val) { add[tr] -= val, mul[tr] += val * r; } -void init(vector<ll>& v) { +void init(vector<ll> &v) { mul.assign(size(v) + 1, 0); add.assign(size(v) + 1, 0); for(int i = 0; i < ssize(v); i++) update(i, i + 1, v[i]); @@ -15,7 +15,7 @@ void init(vector<ll>& v) { ll prefix_sum(int i) { ll res = 0; - for (int ti = i; ti > 0; ti -= ti & -ti) + for (int ti = i; ti > 0; ti &= ti-1) res += add[ti] * i + mul[ti]; return res; } |