upload some new code

FZOI/去重.cpp

@@ -0,0 +1,32 @@
+#include <bits/stdc++.h>
+#define int long long
+#define endl "\n"
+#define IMX LONG_LONG_MAX
+#define IMN LONG_LONG_MIN
+#define debug$ if(dev)
+using namespace std;
+
+/* toothless. #17 */
+
+const int N = 1e7 + 10;
+const int M = 2e3 + 5;
+const bool dev = false;
+
+int n;
+int a[N];
+map<int, bool> mp;
+
+signed main()
+{
+    cin >> n;
+    for (int i = 1; i <= n; i ++ ) {
+        cin >> a[i];
+    }
+    for (int i = 1; i <= n; i ++ ) {
+        if (!mp[a[i]]) {
+            cout << a[i] << " ";
+            mp[a[i]] = true;
+        }
+    }
+    return 0;
+}