Codeforces Round #371 (Div. 2) C. Sonya and Queries 水题

C. Sonya and Queries

题目连接：

http://codeforces.com/contest/714/problem/C

Description

Today Sonya learned about long integers and invited all her friends to share the fun. Sonya has an initially empty multiset with integers. Friends give her t queries, each of one of the following type:

 +  ai — add non-negative integer ai to the multiset. Note, that she has a multiset, thus there may be many occurrences of the same integer.
 -  ai — delete a single occurrence of non-negative integer ai from the multiset. It's guaranteed, that there is at least one ai in the multiset.
? s — count the number of integers in the multiset (with repetitions) that match some pattern s consisting of 0 and 1. In the pattern, 0 stands for the even digits, while 1 stands for the odd. Integer x matches the pattern s, if the parity of the i-th from the right digit in decimal notation matches the i-th from the right digit of the pattern. If the pattern is shorter than this integer, it's supplemented with 0-s from the left. Similarly, if the integer is shorter than the pattern its decimal notation is supplemented with the 0-s from the left.

For example, if the pattern is s = 010, than integers 92, 2212, 50 and 414 match the pattern, while integers 3, 110, 25 and 1030 do not.

Input

The first line of the input contains an integer t (1 ≤ t ≤ 100 000) — the number of operation Sonya has to perform.

Next t lines provide the descriptions of the queries in order they appear in the input file. The i-th row starts with a character ci — the type of the corresponding operation. If ci is equal to '+' or '-' then it's followed by a space and an integer ai (0 ≤ ai < 1018) given without leading zeroes (unless it's 0). If ci equals '?' then it's followed by a space and a sequence of zeroes and onse, giving the pattern of length no more than 18.

It's guaranteed that there will be at least one query of type '?'.

It's guaranteed that any time some integer is removed from the multiset, there will be at least one occurrence of this integer in it.

Output

For each query of the third type print the number of integers matching the given pattern. Each integer is counted as many times, as it appears in the multiset at this moment of time.

Sample Input

12

• 1
• 241
  
  ? 1
• 361

• 241
  
  ? 0101

• 101
  
  ? 101

• 101
  
  ? 101

• 4000
  
  ? 0

Sample Output

2

1

2

1

1

Hint

题意

有n个操作

1.添加一个数

2.删除一个数

3.查询这个集合里面一共有多少个数满足这个01串，这个01串是1的话，表示这位是奇数，否则是偶数。长度不够就补0

题解：

最长是LL，所以我们对于每一个数，都直接处理出来他的18位01串是啥

然后开一个map搞一搞就好了

代码

#include<bits/stdc++.h>
using namespace std;
map<string,int>H;
long long tmp;
int main()
{
    int n;
    scanf("%d",&n);
    while(n--)
    {
        char op[5];
        scanf("%s",op);
        if(op[0]=='+')
        {
            cin>>tmp;
            string s;
            for(int i=0;i<18;i++)
            {
                s+='0'+(tmp%2);
                tmp/=10;
            }
            H[s]++;
        }
        else if(op[0]=='-')
        {
            cin>>tmp;
            string s;
            for(int i=0;i<18;i++)
            {
                s+='0'+(tmp%2);
                tmp/=10;
            }
            H[s]--;
        }
        else
        {
            string ss;
            cin>>ss;
            reverse(ss.begin(),ss.end());
            while(ss.size()!=18)ss+='0';
            cout<<H[ss]<<endl;
        }
    }
}