OverClocking!

Luogu/CodeOverclock/P3156 【深基15.例1】询问学号/map.cpp

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+#include <iostream>
+#include <unordered_map>
+using namespace std;
+int main(){
+	unordered_map<int, int> a;
+	int n, m;
+    cin >> n >> m;
+    int tmp;
+    for(int i = 0; i < n; i++){
+        cin >> tmp;
+        a.emplace(make_pair(i + 1, tmp));
+    }
+    for(int i = 0; i < m; i++){
+        cin >> tmp;
+        cout << a.find(tmp)->second << endl;
+    }
+    return 0;
+}