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| author | Gloria Mundi <gloria@gloria-mundi.eu> | 2024-11-16 01:24:14 +0100 |
|---|---|---|
| committer | Gloria Mundi <gloria@gloria-mundi.eu> | 2024-11-16 01:24:14 +0100 |
| commit | 98567ec798aa8ca2cfbcb85c774dd470f30e30d4 (patch) | |
| tree | 5113d5cc24d1ad5f93810b6442ce584a36950dc8 /datastructures/monotonicConvexHull.cpp | |
| parent | ad3856a6b766087df0036de0b556f4700a6498c9 (diff) | |
| parent | 8d11c6c8213f46f0fa19826917c255edd5d43cb1 (diff) | |
mzuenni tests
Diffstat (limited to 'datastructures/monotonicConvexHull.cpp')
| -rw-r--r-- | datastructures/monotonicConvexHull.cpp | 26 |
1 files changed, 0 insertions, 26 deletions
diff --git a/datastructures/monotonicConvexHull.cpp b/datastructures/monotonicConvexHull.cpp deleted file mode 100644 index e7b9b3e..0000000 --- a/datastructures/monotonicConvexHull.cpp +++ /dev/null @@ -1,26 +0,0 @@ -struct Envelope { - struct Line { - ll m, b; - ll operator()(ll x) { return m*x+b; } - }; - - vector<Line> ls; - int ptr = 0; - - static bool bad(Line l1, Line l2, Line l3) { - return (l3.b-l1.b)*(l1.m-l2.m) < (l2.b-l1.b)*(l1.m-l3.m); - } - - void add(ll m, ll b) { - while (sz(ls) > 1 && bad(ls.end()[-2], ls.back(), {m, b})) { - ls.pop_back(); - } - ls.push_back({m, b}); - ptr = min(ptr, sz(ls) - 1); - } - - ll query(ll x) { - while (ptr < sz(ls)-1 && ls[ptr + 1](x) < ls[ptr](x)) ptr++; - return ls[ptr](x); - } -}; |
