洛谷题单指南-集合-P5266 【深基17.例6】学籍管理

原题链接：https://www.luogu.com.cn/problem/P5266

题意解读：本题考察map的应用。

解题思路：直接使用map即可解题。

100分代码：

#include <bits/stdc++.h>
using namespace std;

map<string, int> h;
string name;
int n, op, score;

int main()
{
    cin >> n;
    while(n--)
    {
        cin >> op;
        if(op == 1)
        {
            cin >> name >> score;
            h[name] = score;
            cout << "OK" << endl;
        }
        else if(op == 2)
        {
            cin >> name;
            if(h.count(name)) cout << h[name] << endl;
            else cout << "Not found" << endl;
        }
        else if(op == 3)
        {
            cin >> name;
            if(h.count(name)) 
            { 
                h.erase(h.find(name)); //查找name所在位置并删除
                cout << "Deleted successfully" << endl;
            }
            else cout << "Not found" << endl;
        }
        else cout << h.size() << endl;
    }
    return 0;
}