1 #include<iostream> 2 #include<cstring> 3 #include<cmath> 4 #include<map> 5 #include<algorithm> 6 #include<cstdio> 7 #define max(a,b) a>b?a:b 8 #define F(i,a,b) for(int i=a;i<=b;i++) 9 #define mes(a,b) memset(a,b,sizeof(a))10 #define INF 0x3f3f3f3f11 #define LL long long12 using namespace std;13 const int N=10010,MAX=1000100;14 15 void fun(char *s)16 {17     int l = 0;18     for(int i=0; i<strlen(s); i++)19     {20         if(s[i] == ‘0‘)21             l++;22         else23             break;24     }25     for(int i=l-1; i<=strlen(s); i++)26     {27         s[i-l+1] = s[i+1];28     }29     if(*s == ‘\0‘)30     {31         *s = ‘0‘;32         s[1] = ‘\0‘;33     }34 }35 36 int main()37 {38     int n;39     char c,s[20];40     map<string,int>M;41     scanf("%d",&n);42     while(n--)43     {44         cin>>c>>s;45         int l = strlen(s);46         for(int i=0; i<l; i++)47         {48             if(s[i]&1)49                 s[i] = ‘1‘;50             else51                 s[i] = ‘0‘;52         }53         //puts(s);54         fun(s);55         //puts(s);56         if(c == ‘+‘)57             M[s]++;58         if(c == ‘-‘)59             M[s]--;60         if(c == ‘?‘)61             cout<<M[s]<<endl;62     }63     return 0;64 }