reverse dynamic convex hull

1 files changed, 3 insertions, 3 deletions

diff --git a/content/datastructures/dynamicConvexHull.cpp b/content/datastructures/dynamicConvexHull.cpp
index 36ef6f5..3e4020e 100644
--- a/content/datastructures/dynamicConvexHull.cpp
+++ b/content/datastructures/dynamicConvexHull.cpp
@@ -1,16 +1,16 @@
 struct Line {
 	mutable ll m, c, p;
-	bool operator<(const Line& o) const { return m < o.m; }
+	bool operator<(const Line& o) const { return m > o.m; }
 	bool operator<(ll x) const { return p < x; }
 };
 
-struct HullDynamic : multiset<Line, less<>> { // max über Geraden
+struct HullDynamic : multiset<Line, less<>> { // min über Geraden
 	// (for doubles, use INF = 1/.0, div(a,c) = a/c)
 	ll div(ll a, ll c) { return a / c - ((a ^ c) < 0 && a % c); }
 
 	bool isect(iterator x, iterator y) {
 		if (y == end()) { x->p = INF; return false; }
-		if (x->m == y->m) x->p = x->c > y->c ? INF : -INF;
+		if (x->m == y->m) x->p = x->c < y->c ? INF : -INF;
 		else x->p = div(y->c - x->c, x->m - y->m);
 		return x->p >= y->p;
 	}