P5266 【深基17.例6】学籍管理

R39714409

problem/P5266/P5266.cpp

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+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main() {
+    int              n, q, a, b;
+    string           s;
+    map<string, int> students;
+    cin >> n;
+    while (n--) {
+        cin >> q;
+        if (q == 1) {
+            cin >> s >> b;
+            students[s] = b;
+            cout << "OK" << endl;
+        }
+        else if (q == 2) {
+            cin >> s;
+            if (students.find(s) != students.end()) {
+                cout << students[s] << endl;
+            }
+            else {
+                cout << "Not found" << endl;
+            }
+        }
+        else if (q == 3) {
+            cin >> s;
+            if (students.find(s) != students.end()) {
+                students.erase(s);
+                cout << "Deleted successfully" << endl;
+            }
+            else {
+                cout << "Not found" << endl;
+            }
+        }
+        else if(q == 4) {
+            cout << students.size() << endl;
+        }
+    }
+    return 0;
+}