拼题 A 系统为提高用户账户的安全性,打算开发一个自动安全预警的功能。对每个账户的每次登录,系统会记录其登录的 IP 地址。每隔一段时间,系统将统计每个账户从多少不同的 IP 地址分别登录了多少次。如果某个账户的登录 IP 超过了 TIP 种,并且登录过于频繁,超过了 Tlogin 次,则会自动向管理员发出警报。
下面就请你实现这个预警功能。
输入首先在第一行中给出三个正整数:N(≤104)为登录记录的条数;TIP 和
Tlogin,定义如题面中所描述,均不超过 100。
随后 N 行,每行格式为:
账户邮箱 IP地址
其中 账户邮箱
为长度不超过 40 的、不包含空格的非空字符串;IP地址
为形如 xxx.xxx.xxx.xxx
的合法 IP 地址。
按照登录所用不同 IP 的数量的非递增顺序,输出每个预警账户的信息。格式为:
- 账户邮箱
- IP1 登录次数
- IP2 登录次数
- ……
其中 IP 按登录次数的非递增顺序输出,如有并列,则按 IP 的递增字典序输出。此外,对所用不同 IP 的数量并列的用户,按其账户邮箱的递增字典序输出。
另一方面,即使没有账户达到预警线,也输出登录所用不同 IP 的数量最多的一批账户的信息。
- 24 3 4
- daohaole@qq.com 218.109.231.189
- 1jiadelaolao@163.com 112.192.203.187
- chenyuelaolao@zju.edu.cn 112.18.235.143
- jiadelaolao@163.com 112.192.203.187
- chenyuelaolao@zju.edu.cn 113.18.235.143
- jiadelaolao@163.com 111.192.203.187
- daohaole@qq.com 218.109.231.189
- chenyuelaolao@zju.edu.cn 111.18.235.143
- 1jiadelaolao@163.com 115.192.203.187
- daohaole@qq.com 113.189.58.141
- 1jiadelaolao@163.com 111.192.203.187
- daohaole@qq.com 112.18.58.145
- 1jiadelaolao@163.com 114.192.203.187
- chenyuelaolao@zju.edu.cn 112.18.235.143
- daohaole@qq.com 123.89.158.214
- chenyuelaolao@zju.edu.cn 112.18.235.143
- youdaohaole@qq.com 218.109.231.189
- jiadelaolao@163.com 113.192.203.187
- youdaohaole@qq.com 218.109.231.189
- jiadelaolao@163.com 114.192.203.187
- youdaohaole@qq.com 113.189.58.141
- youdaohaole@qq.com 123.89.158.214
- 1jiadelaolao@163.com 113.192.203.187
- youdaohaole@qq.com 112.18.58.145
- 1jiadelaolao@163.com
- 111.192.203.187 1
- 112.192.203.187 1
- 113.192.203.187 1
- 114.192.203.187 1
- 115.192.203.187 1
- daohaole@qq.com
- 218.109.231.189 2
- 112.18.58.145 1
- 113.189.58.141 1
- 123.89.158.214 1
- youdaohaole@qq.com
- 218.109.231.189 2
- 112.18.58.145 1
- 113.189.58.141 1
- 123.89.158.214 1
- 24 5 8
- daohaole@qq.com 218.109.231.189
- 1jiadelaolao@163.com 112.192.203.187
- chenyuelaolao@zju.edu.cn 112.18.235.143
- jiadelaolao@163.com 112.192.203.187
- chenyuelaolao@zju.edu.cn 113.18.235.143
- jiadelaolao@163.com 111.192.203.187
- daohaole@qq.com 218.109.231.189
- chenyuelaolao@zju.edu.cn 111.18.235.143
- 1jiadelaolao@163.com 115.192.203.187
- daohaole@qq.com 113.189.58.141
- 1jiadelaolao@163.com 111.192.203.187
- daohaole@qq.com 112.18.58.145
- 1jiadelaolao@163.com 114.192.203.187
- chenyuelaolao@zju.edu.cn 112.18.235.143
- daohaole@qq.com 123.89.158.214
- chenyuelaolao@zju.edu.cn 112.18.235.143
- youdaohaole@qq.com 218.109.231.189
- jiadelaolao@163.com 113.192.203.187
- youdaohaole@qq.com 218.109.231.189
- jiadelaolao@163.com 114.192.203.187
- youdaohaole@qq.com 113.189.58.141
- youdaohaole@qq.com 123.89.158.214
- 1jiadelaolao@163.com 113.192.203.187
- youdaohaole@qq.com 112.18.58.145
- 1jiadelaolao@163.com
- 111.192.203.187 1
- 112.192.203.187 1
- 113.192.203.187 1
- 114.192.203.187 1
- 115.192.203.187 1
题意: 给出n条登录记录,每个记录由登录邮箱和登录ip组成,同时给出两参数k1和k2,当某邮箱登录次数超过k1且不同登录ip超过k2就将该登录邮箱标记为预警账户,按照题目要求输出所有预警账户,每个预警账户还要输出各登录ip及其出现次数,如果不存在预警账户,那么就输出不同ip最多的那批账户信息。
分析: 其实就是一个比较复杂的模拟题,如果借助stl来实现就会比较容易,首先用一个map
具体代码如下:
- #include
- #include
- #include
- #include
- #include
- #include
- #include
- #include
- #include
- using namespace std;
-
- unordered_map
> mp; - unordered_map
int>>> mp2; -
- bool cmp(string x, string y){
- if(mp2[x].size() != mp2[y].size())
- return mp2[x].size() > mp2[y].size();
- return x < y;
- }
-
- bool cmp2(pair
int > x, pairint > y){ - if(x.second != y.second)
- return x.second > y.second;
- return x.first < y.first;
- }
-
- signed main()
- {
- ios::sync_with_stdio(0);
- cin.tie(0);
- int n, k1, k2;
- cin >> n >> k1 >> k2;
- for(int i = 1; i <= n; i++){
- string s1, s2;
- cin >> s1 >> s2;
- mp[s1].push_back(s2);
- }
- vector
res; - for(unordered_map
>::iterator it = mp.begin(); it != mp.end(); it++){ - unordered_map
int> a; - for(int i = 0; i < (it->second).size(); i++){
- string s = (it->second)[i];
- a[s]++;
- }
- for(unordered_map
int>::iterator i = a.begin(); i != a.end(); i++) - mp2[it->first].push_back(make_pair(i->first, a[i->first]));
- if(a.size() > k1 && (it->second).size() > k2)
- res.push_back(it->first);
- }
- sort(res.begin(), res.end(), cmp);
- for(int i = 0; i < res.size(); i++){
- cout << res[i] << endl;
- vector
int>> ip = mp2[res[i]]; - sort(ip.begin(), ip.end(), cmp2);
- for(int j = 0; j < ip.size(); j++)
- cout << ip[j].first << " " << ip[j].second << endl;
- }
- if(res.size() == 0){
- int mx = 0;
- for(unordered_map
int>>>::iterator it = mp2.begin(); it != mp2.end(); it++){ - mx = max(mx, (int)(it->second).size());
- }
- for(unordered_map
int>>>::iterator it = mp2.begin(); it != mp2.end(); it++){ - if((it->second).size() == mx)
- res.push_back(it->first);
- }
- sort(res.begin(), res.end(), cmp);
- for(int i = 0; i < res.size(); i++){
- cout << res[i] << endl;
- vector
int>> ip = mp2[res[i]]; - sort(ip.begin(), ip.end(), cmp2);
- for(int j = 0; j < ip.size(); j++)
- cout << ip[j].first << " " << ip[j].second << endl;
- }
- }
- return 0;
- }