1 files changed, 48 insertions, 0 deletions
diff --git a/store/works/life/chuanzhi-cup/contest/4.cpp b/store/works/life/chuanzhi-cup/contest/4.cpp
new file mode 100644
index 0000000..da01a23
--- /dev/null
+++ b/store/works/life/chuanzhi-cup/contest/4.cpp
@@ -0,0 +1,48 @@
+#include <algorithm>
+#include <cstdio>
+#include <iostream>
+#include <string>
+#include <vector>
+
+int main() {
+  std::vector<std::string> files;
+  int n;
+  std::cin >> n;
+  int current_count = 0;
+  while (current_count < n) {
+    std::string command;
+    std::cin >> command;
+    char a = command[0];
+    if (a == 't') {
+      std::string file;
+      std::cin >> file;
+      auto iter = std::find(files.cbegin(), files.cend(), file);
+      if (iter == files.cend()) {
+        files.push_back(std::move(file));
+      }
+    } else if (a == 'l') {
+      for (const auto &f : files) {
+        std::cout << f << '\n';
+      }
+    } else {
+      char b = command[1];
+      if (b == 'm') {
+        std::string file;
+        auto iter = std::find(files.cbegin(), files.cend(), file);
+        if (iter != files.cend())
+          files.erase(iter);
+      } else {
+        std::string old, new_f;
+        std::cin >> old >> new_f;
+        auto iter = std::find(files.begin(), files.end(), old);
+        auto iter2 = std::find(files.begin(), files.end(), new_f);
+        if (iter != files.end() && iter2 == files.end()) {
+          *iter = std::move(new_f);
+        }
+      }
+    }
+    current_count++;
+  }
+
+  return 0;
+}