Update segment_tree.cpp

Changes

1 changed files (+1/-1)

• Data Structures/segment_tree.cpp
  • @@ -17,7 +17,7 @@ void update(int x, T v, int l = 0, int r = -1, int n = 1) {
    void update(int a, int b, int v, int l = 0, int r = -1, int n = 1) { if (r == -1) r = N - 1; push(l, r, n); - if (l > b || r < a) return; + if (l > r || l > b || r < a) return; if (l >= a && r <= b) { tmp[n] += v; push(l, r, n);