diff --git a/UniversalOJ/734/734.cpp b/UniversalOJ/734/734.cpp
new file mode 100644
index 00000000..560b977a
--- /dev/null
+++ b/UniversalOJ/734/734.cpp
@@ -0,0 +1,69 @@
+#include <cstdio>
+#include <iostream>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 105;
+
+int n;
+std::string s[N];
+std::unordered_map<std::string, std::pair<std::string, bool>> def;
+
+std::string dfs(std::string s) {
+    std::string r;
+
+    for (int i = 0, j; i < s.size(); i += j) {
+        for (j = 0; i + j < s.size() &&
+                    ('0' <= s[i + j] && s[i + j] <= '9' ||
+                     'a' <= s[i + j] && s[i + j] <= 'z' ||
+                     'A' <= s[i + j] && s[i + j] <= 'Z' || s[i + j] == '_');
+             j++)
+            ;
+        if (j) {
+            std::string tmp = s.substr(i, j), tmp2;
+
+            if (def.count(tmp) && !def[tmp].second) {
+                def[tmp].second = true;
+                r += dfs(def[tmp].first);
+                def[tmp].second = false;
+            } else {
+                r += tmp;
+            }
+        } else {
+            r += s[i++];
+        }
+    }
+
+    return r;
+}
+
+int main() {
+    cin >> n;
+    for (int i = 0; i <= n; i++) {
+        std::getline(cin, s[i]);
+    }
+
+    for (int i = 1; i <= n; i++) {
+        if (s[i][0] == '#') {
+            if (s[i].substr(1, 6) == "define") {
+                int p = s[i].find_first_of(' ', 8);
+                std::string name = s[i].substr(8, p - 8),
+                            content = s[i].substr(p + 1);
+                def[name] = std::make_pair(content, false);
+            } else {  // s[i].substr(1, 6) == "undef"
+                std::string name = s[i].substr(7);
+                def.erase(name);
+            }
+            cout << endl;
+        } else {
+            cout << dfs(s[i]) << endl;
+        }
+    }
+
+    return 0;
+}
diff --git a/UniversalOJ/734/data/ex_preprocessor1.ans b/UniversalOJ/734/data/ex_preprocessor1.ans
new file mode 100644
index 00000000..cef8a13c
--- /dev/null
+++ b/UniversalOJ/734/data/ex_preprocessor1.ans
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:86919d6fd2da1a28c380430021e707472a56b647fb27b1fa6626892169c60531
+size 6
diff --git a/UniversalOJ/734/data/ex_preprocessor1.in b/UniversalOJ/734/data/ex_preprocessor1.in
new file mode 100644
index 00000000..c086d2e8
--- /dev/null
+++ b/UniversalOJ/734/data/ex_preprocessor1.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
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+size 45
diff --git a/UniversalOJ/734/data/ex_preprocessor2.ans b/UniversalOJ/734/data/ex_preprocessor2.ans
new file mode 100644
index 00000000..fd481aab
--- /dev/null
+++ b/UniversalOJ/734/data/ex_preprocessor2.ans
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
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+size 1
diff --git a/UniversalOJ/734/data/ex_preprocessor2.in b/UniversalOJ/734/data/ex_preprocessor2.in
new file mode 100644
index 00000000..e284fabc
--- /dev/null
+++ b/UniversalOJ/734/data/ex_preprocessor2.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
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+size 15
diff --git a/UniversalOJ/734/data/preprocessor1.ans b/UniversalOJ/734/data/preprocessor1.ans
new file mode 100644
index 00000000..a999b575
--- /dev/null
+++ b/UniversalOJ/734/data/preprocessor1.ans
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+version https://git-lfs.github.com/spec/v1
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+size 27
diff --git a/UniversalOJ/734/data/preprocessor1.in b/UniversalOJ/734/data/preprocessor1.in
new file mode 100644
index 00000000..0559b2b0
--- /dev/null
+++ b/UniversalOJ/734/data/preprocessor1.in
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+version https://git-lfs.github.com/spec/v1
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diff --git a/UniversalOJ/734/data/preprocessor10.ans b/UniversalOJ/734/data/preprocessor10.ans
new file mode 100644
index 00000000..dddb7814
--- /dev/null
+++ b/UniversalOJ/734/data/preprocessor10.ans
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+version https://git-lfs.github.com/spec/v1
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+size 7153
diff --git a/UniversalOJ/734/data/preprocessor10.in b/UniversalOJ/734/data/preprocessor10.in
new file mode 100644
index 00000000..2d4315a7
--- /dev/null
+++ b/UniversalOJ/734/data/preprocessor10.in
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+version https://git-lfs.github.com/spec/v1
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diff --git a/UniversalOJ/734/data/preprocessor2.ans b/UniversalOJ/734/data/preprocessor2.ans
new file mode 100644
index 00000000..fd256d06
--- /dev/null
+++ b/UniversalOJ/734/data/preprocessor2.ans
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+version https://git-lfs.github.com/spec/v1
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diff --git a/UniversalOJ/734/data/preprocessor2.in b/UniversalOJ/734/data/preprocessor2.in
new file mode 100644
index 00000000..2e84412f
--- /dev/null
+++ b/UniversalOJ/734/data/preprocessor2.in
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+version https://git-lfs.github.com/spec/v1
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diff --git a/UniversalOJ/734/data/preprocessor3.ans b/UniversalOJ/734/data/preprocessor3.ans
new file mode 100644
index 00000000..72fb7573
--- /dev/null
+++ b/UniversalOJ/734/data/preprocessor3.ans
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+version https://git-lfs.github.com/spec/v1
+oid sha256:70b6d000a49b687f6b494b49bab220f26698e6b008f8a3ddbbc39cc99313ed5f
+size 43
diff --git a/UniversalOJ/734/data/preprocessor3.in b/UniversalOJ/734/data/preprocessor3.in
new file mode 100644
index 00000000..a0a3ee39
--- /dev/null
+++ b/UniversalOJ/734/data/preprocessor3.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
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diff --git a/UniversalOJ/734/data/preprocessor4.ans b/UniversalOJ/734/data/preprocessor4.ans
new file mode 100644
index 00000000..5bdfb1d2
--- /dev/null
+++ b/UniversalOJ/734/data/preprocessor4.ans
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+version https://git-lfs.github.com/spec/v1
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+size 187
diff --git a/UniversalOJ/734/data/preprocessor4.in b/UniversalOJ/734/data/preprocessor4.in
new file mode 100644
index 00000000..50dea4f2
--- /dev/null
+++ b/UniversalOJ/734/data/preprocessor4.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
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new file mode 100644
index 00000000..ae878f96
--- /dev/null
+++ b/UniversalOJ/734/data/preprocessor5.ans
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new file mode 100644
index 00000000..9585bf03
--- /dev/null
+++ b/UniversalOJ/734/data/preprocessor5.in
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new file mode 100644
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new file mode 100644
index 00000000..c611d977
--- /dev/null
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new file mode 100644
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new file mode 100644
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--- /dev/null
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new file mode 100644
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--- /dev/null
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new file mode 100644
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