Update fenwick_tree.cpp

1 files changed, 1 insertions, 1 deletions

diff --git a/Data Structures/fenwick_tree.cpp b/Data Structures/fenwick_tree.cpp
index 19120ab..ba75c58 100644
--- a/Data Structures/fenwick_tree.cpp
+++ b/Data Structures/fenwick_tree.cpp
@@ -3,6 +3,6 @@ private: vector<T> FT;
 public:
 	fenwick_tree(int N) { FT.assign(N + 5, 0); }
 	void update(int x, T val) { if (++x) for (; x < FT.size(); x += x & -x) FT[x] += val; }
-	T query(int x) { T ret = 0; if (++x) for (; x > 0; x -= x & -x) ret += FT[x]; return ret; }
+	T query(int x) { T ret = 0; if (++x) for (; x; x -= x & -x) ret += FT[x]; return ret; }
 	T query(int x, int y) { return query(y) - query(x - 1); }
 };
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