Problem:
Search III

Your task is to write a program of a simple dictionary which implements the following instructions:

insert str: insert a string str in to the dictionary

find str: if the distionary contains str, then print 'yes', otherwise print 'no'

Input

In the first line n, the number of instructions is given. In the following n lines, n instructions are given in the above mentioned format.

Output

Print yes or no for each find instruction in a line.

Constraints

A string consists of 'A', 'C', 'G', or 'T'

1 ≤ length of a string ≤ 12

n ≤ 1000000

Sample Input 1

5
insert A
insert T
insert C
find G
find A

Sample Output 1

no
yes

Sample Input 2

13
insert AAA
insert AAC
insert AGA
insert AGG
insert TTT
find AAA
find CCC
find CCC
insert CCC
find CCC
insert T
find TTT
find T

Sample Output 2

yes
no
no
yes
yes
yes

Notes

Template in C

Solution in C (judge verdict: Accepted)

#include<stdio.h>
#include<string.h>
 
#define M 1000005
#define L 14
 
char HS[M][L]; 
 
int getChar(char ch){
  if ( ch == 'A') return 1;
  else if ( ch == 'C') return 2;
  else if ( ch == 'G') return 3;
  else if ( ch == 'T') return 4;
}
 

long long getKey(char str[]){
  long long sum = 0, p = 1, i;
  for ( i = 0; i < strlen(str); i++ ){
    sum += p*(getChar(str[i]));
    p *= 5;
  }
  return sum;
}
 
int h1(int key){ return key % M; }
int h2(int key){ return 1 + key % (M-1); }
 
int find(char str[]){

  long long fin;
  int i = 0;
  long long sum = getKey(str); 

  while(1){
    fin = (h1(sum) + h2(sum)*i) %M;
    if(strcmp(HS[fin],str) == 0) return 1;
    if(HS[fin][0] == '\0') return 0;
    i++;
  }

  return 0;

}
 
void insert(char str[]){
 
 int  i = 0;
  long long ser;
  long long sum = getKey(str);
  
  while(1){
    ser = (h1(sum) + h2(sum) *i) %M;
    if(HS[ser][0] == '\0' || strcmp(HS[ser],str) == 0){
      strcpy(HS[ser],str);
      break;
    }

    i++;
  }

}
 
int main(){
    int i, n, h;
    char str[L], com[9];
    for ( i = 0; i < M; i++ ) HS[i][0] = '\0';
     
    scanf("%d", &n);
     
    for ( i = 0; i < n; i++ ){
    scanf("%s %s", com, str);
     
    if ( com[0] == 'i' ){
        insert(str);
    } 
    else {
        if (find(str)){
        printf("yes\n");
        } else {
        printf("no\n");
        }
    }
 }
 
    return 0;
}