一、解题思路
采用unordered_map建立起QQ号和pwd的映射，仅此而已
二、解题代码
#include <iostream>
#include <string>
#include <unordered_map>
using namespace std
;
int main(){
int N
;
cin
>> N
;
unordered_map
<string
, string
> ump
;
for(int i
= 0; i
< N
; i
++){
char cmd
;
string id
, pwd
;
cin
>> cmd
>> id
>> pwd
;
if(cmd
== 'L'){
if(ump
.find(id
) == ump
.end()) cout
<< "ERROR: Not Exist" << endl
;
else if(ump
[id
] == pwd
) cout
<< "Login: OK" << endl
;
else cout
<< "ERROR: Wrong PW" << endl
;
}
else if(cmd
== 'N'){
if(ump
.find(id
) != ump
.end()) cout
<< "ERROR: Exist" << endl
;
else {
ump
[id
] = pwd
;
cout
<< "New: OK" << endl
;
}
}
}
return 0;
}
三、运行结果
