diff --git a/src/20241111/U101804.cpp b/src/20241111/U101804.cpp
index e7b85f7..d562602 100644
--- a/src/20241111/U101804.cpp
+++ b/src/20241111/U101804.cpp
@@ -1,4 +1,5 @@
 #include <algorithm>
+#include <array>
 #include <cstdint>
 #include <iostream>
 #include <ranges>
@@ -27,9 +28,47 @@ func print(Args...args){
 }
 
 const i64 max_n = 100000 + 5, mod{998244353};
-i64 w[max_n], a[max_n];
+i64 w[max_n], a[max_n], dfs_in[max_n], dfs_out[max_n];
 std::vector<i64> sons[max_n];
 
+template<i64 size>
+class Segtree{
+private:
+    std::array<i64, size*4> nodes{};
+    std::array<i64, size*4> lazy_mul;
+    void build(const i64 (&arr)[], const i64 l, const i64 r, const i64 n){
+        if(l==r){
+            nodes[n]=arr[l];
+            return;
+        }
+
+        const i64 mid {(l+r)/2};
+        build(arr, l, mid, n*2);
+        build(arr, mid+1, r, n*2+1);
+
+        nodes[n] = nodes[n*2] + nodes[n*2+1];
+    }
+
+    void update_mul(const i64 ul, const i64 ur, const i64 l, const i64 r,const i64 n){
+        if(lazy_mul[n]!=1){
+            // nodes[]
+        }
+
+        if(r < ul || ur < l){
+            return;
+        }
+    }
+public:
+    Segtree(const i64 (&arr)[], const i64 n){
+        build(arr, 1, n, 1);
+        std::fill(lazy_mul.begin(), lazy_mul.end(), 1);
+    }
+
+};
+
+//testing
+Segtree<50> st(a,2);
+
 i64 mod_pow(i64 b, i64 e, const i64 m = mod){
     b %= mod;
     i64 res {1};
diff --git a/src/20241113/T538693.cpp b/src/20241113/T538693.cpp
new file mode 100644
index 0000000..99494e8
--- /dev/null
+++ b/src/20241113/T538693.cpp
@@ -0,0 +1,105 @@
+#include <algorithm>
+#include <array>
+#include <cstdint>
+#include <cstdlib>
+#include <functional>
+#include <iomanip>
+#include <ios>
+#include <iostream>
+#include <istream>
+#include <queue>
+#include <ranges>
+#include <stdexcept>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+using int64 = std::int64_t;
+
+template<class ...Args>
+void input(Args&&...args){
+    (std::cin>>...>>std::forward<Args>(args));
+}
+
+template<class T>
+std::remove_cv_t<T> input(){
+    std::remove_cv_t<T> t;
+    std::cin>>t;
+    return t;
+}
+
+template<class ...Args>
+void print(Args&&...args){
+    (std::cout<<...<<args);
+}
+
+struct Point{
+    int64 x, y;
+    bool operator<(const Point &that)const{
+        return (this->x + this->y) < (that.x + that.y);
+    }
+    bool operator==(const Point &that)const{
+        return this->x == that.x && this->y == that.y;
+    }
+};
+
+using Vector2 = Point;
+using Status = std::pair<Vector2, Point>;
+
+const int64 max_n = 100 + 5;
+int64 _map[max_n][max_n];
+const int64 (&map)[max_n][max_n] = _map;
+const std::array<std::array<int64, 2>, 4> dir{{
+    {0, 1},
+    {1, 0},
+    {-1, 0},
+    {0, -1}
+}};
+
+int main(){
+    std::iostream::sync_with_stdio(false), std::cin.tie(nullptr), std::cout.tie(nullptr);
+    std::cout<<std::fixed<<std::setprecision(3);
+
+    const int64 n = input<decltype(n)>(), m = input<decltype(m)>();
+
+    const auto inputPoint = []()->Point{
+        Point ret;
+        input(ret.x, ret.y);
+        return ret;
+    };
+    const Point start = inputPoint(), end = inputPoint();
+
+    std::ranges::for_each(std::ranges::views::iota(1, n+1), [&](const auto &i){
+        std::ranges::for_each(std::ranges::views::iota(1,m+1), [&](const auto &j){
+            input(_map[n][m]);
+        });
+    });
+
+    const double ansScore = input<double>();
+
+    std::priority_queue<Status, std::vector<Status>, std::greater<>> pq;
+    pq.emplace(Vector2{0, 0}, start);
+
+    const Vector2 ansVec = [&]()->Vector2{
+        while(!pq.empty()){
+            const auto top = pq.top();
+            pq.pop();
+
+            if(top.second == end){
+                return top.first;
+            }
+
+            for (const auto i : dir) {
+                const Point nextPoint = {top.second.x + i[0], top.second.y + i[1]};
+                if(map[nextPoint.x][nextPoint.y] == 1 || nextPoint.x < 1 || nextPoint.x > n || nextPoint.y < 1 || nextPoint.y > m){
+                    continue;
+                }
+                pq.emplace(Vector2{.x = top.first.x + std::abs(i[0]), .y = top.first.y + std::abs(i[1])}, nextPoint);
+            }
+        }
+        throw std::runtime_error("unreachable");
+    }();
+
+    const double udTimes = ansScore - (double)ansVec.x;
+    print(udTimes/ansVec.y);
+}
\ No newline at end of file