Merge pull request #379 from hitonanode/add-range-add-chmax-range-min-tree

add range-add-chmax-range-min segtree

Author: hitonanode

segmenttree/trees/acl_range-add-chmax-range-min.hpp

@@ -0,0 +1,33 @@
+#pragma once
+#include "../acl_lazysegtree.hpp"
+#include <algorithm>
+
+namespace RangeAddChmaxRangeMin {
+
+using S = long long;
+constexpr S INF = 1LL << 60;
+
+S e() { return INF; }
+
+S op(S l, S r) { return std::min(l, r); }
+
+struct F {
+    // meaning: max(lower_bound, x) + bias
+    S lower_bound, bias;
+    F() : lower_bound(-INF), bias(0) {}
+    F(S lower_bound, S bias) : lower_bound(lower_bound), bias(bias) {}
+    static F chmax(S x) { return F(x, S()); }
+    static F add(S x) { return F(-INF, x); }
+};
+
+F id() { return F(); }
+
+S mapping(F f, S x) { return std::max(f.lower_bound, x) + f.bias; }
+
+F composition(F fnew, F gold) {
+    return F(std::max(gold.lower_bound + gold.bias, fnew.lower_bound) - gold.bias,
+             gold.bias + fnew.bias);
+}
+
+using segtree = atcoder::lazy_segtree<S, op, e, F, mapping, composition, id>;
+}; // namespace RangeAddChmaxRangeMin