P4305 [JLOI2011]不重复数字

R44293000

problem/P4305/P4305.cpp

@@ -0,0 +1,36 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+inline void read(int& ret) {
+    ret = 0;
+    int f = 1;
+    char ch = getchar();
+    while (!isdigit(ch)) {
+        if (ch == '-') f = -f;
+        ch = getchar();
+    }
+    while (isdigit(ch)) {
+        ret = ret * 10 + ch - '0', ch = getchar();
+    }
+    ret *= f;
+}
+
+int main() {
+    int t;
+    read(t);
+    while (t--) {
+        int n, x;
+        unordered_map<int, bool> m;
+        read(n);
+        for (int i = 0; i < n; i++) {
+            read(x);
+            if (!m[x]) {
+                m[x] = true;
+                printf("%d ", x);
+            }
+        }
+        printf("\n");
+    }
+    return 0;
+}