From f32a00178f0d3b2152a6fc1dc492c987aaede85f Mon Sep 17 00:00:00 2001 From: MZuenni Date: Tue, 13 Aug 2024 17:14:17 +0200 Subject: small improvements --- content/datastructures/dynamicConvexHull.cpp | 16 ++++++++-------- content/datastructures/pbds.cpp | 4 ++-- 2 files changed, 10 insertions(+), 10 deletions(-) (limited to 'content/datastructures') diff --git a/content/datastructures/dynamicConvexHull.cpp b/content/datastructures/dynamicConvexHull.cpp index 27ec898..abae1d7 100644 --- a/content/datastructures/dynamicConvexHull.cpp +++ b/content/datastructures/dynamicConvexHull.cpp @@ -1,22 +1,22 @@ struct Line { - mutable ll m, b, p; + mutable ll m, c, p; bool operator<(const Line& o) const {return m < o.m;} bool operator<(ll x) const {return p < x;} }; struct HullDynamic : multiset> { // max über Geraden - // (for doubles, use INF = 1/.0, div(a,b) = a/b) - ll div(ll a, ll b) {return a / b - ((a ^ b) < 0 && a % b);} + // (for doubles, use INF = 1/.0, div(a,c) = a/c) + ll div(ll a, ll c) {return a / b - ((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->b > y->b ? INF : -INF; - else x->p = div(y->b - x->b, x->m - y->m); + 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; } - void add(ll m, ll b) { - auto x = insert({m, b, 0}); + void add(ll m, ll c) { + auto x = insert({m, c, 0}); while (isect(x, next(x))) erase(next(x)); if (x != begin()) { x--; @@ -31,6 +31,6 @@ struct HullDynamic : multiset> { // max über Geraden ll query(ll x) { auto l = *lower_bound(x); - return l.m * x + l.b; + return l.m * x + l.c; } }; diff --git a/content/datastructures/pbds.cpp b/content/datastructures/pbds.cpp index f0889a2..de0ace6 100644 --- a/content/datastructures/pbds.cpp +++ b/content/datastructures/pbds.cpp @@ -6,11 +6,11 @@ using Tree = tree, rb_tree_tag, // T.order_of_key(x): number of elements strictly less than x // *T.find_by_order(k): k-th element +constexpr uint64_t RNG = ll(2e18 * acos(-1)) | 199; // random odd template struct chash { - static const uint64_t C = ll(2e18 * acos(-1)) | 199; // random odd size_t operator()(T o) const { - return __builtin_bswap64(hash()(o) * C); + return __builtin_bswap64(hash()(o) * RNG); }}; template using hashMap = gp_hash_table>; -- cgit v1.2.3