diff --git a/LibreOJ/144/144.cpp b/LibreOJ/144/144.cpp
new file mode 100644
index 00000000..c03f6cfa
--- /dev/null
+++ b/LibreOJ/144/144.cpp
@@ -0,0 +1,88 @@
+#include <iostream>
+#include <vector>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 1e6 + 5;
+
+int n, m, r, v[N];
+long long f[N];
+int cnt, in[N], out[N];
+std::vector<int> g[N];
+
+int lowbit(int x) {
+    return x & -x;
+}
+
+void add(int x, int y) {
+    for (int i = x; i <= n; i += lowbit(i)) {
+        f[i] += y;
+    }
+}
+
+long long query(int x) {
+    long long res = 0;
+
+    for (int i = x; i; i -= lowbit(i)) {
+        res += f[i];
+    }
+
+    return res;
+}
+
+void dfs(int u, int f) {
+    in[u] = ++cnt;
+    add(cnt, v[u]);
+
+    for (int v : g[u]) {
+        if (v == f) continue;
+
+        dfs(v, u);
+    }
+
+    out[u] = cnt;
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> n >> m >> r;
+
+    for (int i = 1; i <= n; i++) {
+        cin >> v[i];
+    }
+
+    for (int i = 1, u, v; i < n; i++) {
+        cin >> u >> v;
+
+        g[u].emplace_back(v);
+        g[v].emplace_back(u);
+    }
+
+    dfs(r, 0);
+
+    while (m--) {
+        int op;
+
+        cin >> op;
+
+        if (op == 1) {
+            int a, x;
+
+            cin >> a >> x;
+
+            add(in[a], x);
+        } else {  // op == 2
+            int a;
+
+            cin >> a;
+
+            cout << query(out[a]) - query(in[a] - 1) << endl;
+        }
+    }
+
+    return 0;
+}
diff --git a/LibreOJ/144/data/144_1.in b/LibreOJ/144/data/144_1.in
new file mode 100644
index 00000000..7fe31054
--- /dev/null
+++ b/LibreOJ/144/data/144_1.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:570993e9ca630c37fe2e075addd1760ffd90676a8ebaf6192be2fa1182606633
+size 147
diff --git a/LibreOJ/144/data/144_1.out b/LibreOJ/144/data/144_1.out
new file mode 100644
index 00000000..893c9726
--- /dev/null
+++ b/LibreOJ/144/data/144_1.out
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a47ca0ec24965149ec6031cdf2cad3b4b4b5354461420aa853b55f8e9c7a989a
+size 20
diff --git a/LibreOJ/144/data/144_2.in b/LibreOJ/144/data/144_2.in
new file mode 100644
index 00000000..1d76c1d8
--- /dev/null
+++ b/LibreOJ/144/data/144_2.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d306069da3587c06918f4cc07327b4386b9d3cbf42152e2420c14f81f370d704
+size 3868639
diff --git a/LibreOJ/144/data/144_2.out b/LibreOJ/144/data/144_2.out
new file mode 100644
index 00000000..0936071d
--- /dev/null
+++ b/LibreOJ/144/data/144_2.out
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:f86282b3f6e27d9a4942ce898362facad3722a018d2c0fd0be6932174cc4c851
+size 555957
diff --git a/LibreOJ/144/data/144_3.in b/LibreOJ/144/data/144_3.in
new file mode 100644
index 00000000..052fbd0a
--- /dev/null
+++ b/LibreOJ/144/data/144_3.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b3f1e100babc5f9df29fd85ad61da393dd3260f02bed00af47c87171dfd0b44b
+size 19536437
diff --git a/LibreOJ/144/data/144_3.out b/LibreOJ/144/data/144_3.out
new file mode 100644
index 00000000..0980a75d
--- /dev/null
+++ b/LibreOJ/144/data/144_3.out
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:e8866bc8b32b8e2ecfbb35058debb5c711c291ab3ef9d6556d32fee94ce9fbd8
+size 2428910
diff --git a/LibreOJ/144/data/144_4.in b/LibreOJ/144/data/144_4.in
new file mode 100644
index 00000000..fa20d71f
--- /dev/null
+++ b/LibreOJ/144/data/144_4.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:03fe202c639c3f9f2057a1de7aefe99666b1800f2bd7a8a66358115e712b3a3f
+size 33954094
diff --git a/LibreOJ/144/data/144_4.out b/LibreOJ/144/data/144_4.out
new file mode 100644
index 00000000..073c7632
--- /dev/null
+++ b/LibreOJ/144/data/144_4.out
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:109831322ce7e62ca14379967af2682976b1af57f9dde9415d9d70351da84108
+size 3262347
diff --git a/LibreOJ/144/data/144_5.in b/LibreOJ/144/data/144_5.in
new file mode 100644
index 00000000..3ddf2593
--- /dev/null
+++ b/LibreOJ/144/data/144_5.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8098eb9e668a196fbcd275aa8dcab3e5a72453482616f894c5b8f362ad756043
+size 33929419
diff --git a/LibreOJ/144/data/144_5.out b/LibreOJ/144/data/144_5.out
new file mode 100644
index 00000000..f9df4897
--- /dev/null
+++ b/LibreOJ/144/data/144_5.out
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:1a835071f23707e41b2d8bc7f334abb2368c8982a2a7d2e0188ad995ecb63756
+size 3419797