Precreation contest files

misc/chuyen-de-xau/b3.cpp

@@ -0,0 +1,28 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+int main() {
+  ios_base::sync_with_stdio(false);
+  cin.tie(NULL);
+  freopen("B3.INP", "r", stdin);
+
+  map<string, char> hash;
+
+  int q;
+  cin >> q;
+  for (int i = 0; i < q; i++) {
+    string a;
+    cin >> a;
+    // cout << a;
+    if (hash.find(a) == hash.end()) {
+      hash[a] = 1;
+    } else {
+      hash[a] = 0;
+    }
+  }
+
+  for (const auto i : hash) {
+    if (i.second == 1)
+      cout << i.first << '\n';
+  }
+}