Language: C++

#include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <cmath>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <stdio.h>

#define M 1046527
#define NIL (-1)
#define L 14
using namespace std;

char H[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;
    else return 0;
}
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 key, i, h;
    key = getKey(str);
    for(i=0;;i++){
        h=(h1(key)+i*h2(key)) % M;
        if(strcmp(H[h],str)==0) return 1;
        else if(strlen(H[h])==0) return 0;
    }
    return 0;
}
int insert(char str[]){
    long long key, i, h;
    key=getKey(str);
    for(i=0;;i++){
        h=(h1(key)+i*h2(key)) % M;
        if(strcmp(H[h],str)==0) return 1;
        else if(strlen(H[h])==0){
            strcpy(H[h],str);
            return 0;
        }
    }
    return 0;
}

int main(void){
    int i, n, h;
    char str[L], com[9];
    for(i=0;i<n;i++) H[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;
}

Compiler output:
a.cc: In function 'long long int getKey(char*)':
a.cc:30:15: error: 'strlen' was not declared in this scope
   30 |     for(i=0;i<strlen(str);i++){
      |               ^~~~~~
a.cc:10:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    9 | #include <stack>
  +++ |+#include <cstring>
   10 | #include <string>
a.cc: In function 'int find(char*)':
a.cc:47:12: error: 'strcmp' was not declared in this scope
   47 |         if(strcmp(H[h],str)==0) return 1;
      |            ^~~~~~
a.cc:47:12: note: 'strcmp' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
a.cc:48:17: error: 'strlen' was not declared in this scope
   48 |         else if(strlen(H[h])==0) return 0;
      |                 ^~~~~~
a.cc:48:17: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
a.cc: In function 'int insert(char*)':
a.cc:57:12: error: 'strcmp' was not declared in this scope
   57 |         if(strcmp(H[h],str)==0) return 1;
      |            ^~~~~~
a.cc:57:12: note: 'strcmp' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
a.cc:58:17: error: 'strlen' was not declared in this scope
   58 |         else if(strlen(H[h])==0){
      |                 ^~~~~~
a.cc:58:17: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
a.cc:59:13: error: 'strcpy' was not declared in this scope
   59 |             strcpy(H[h],str);
      |             ^~~~~~
a.cc:59:13: note: 'strcpy' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'