C :

#include<stdio.h>
#include<string.h>
#include<math.h>

int main()
{
	int n,i,t,flag=0,num=0,len,j,k,l;
	char s[100][105],s1[25],temp[25];
	scanf("%d",&t);
	for(i=0;i<t;i++)
	{
		num=0;
		scanf("%d",&n);
		getchar();
		gets(s1);
		
		for(j=0;j<n;j++)
			gets(s[j]);
		for(j=0;j<n;j++)
		{
			len=strlen(s[j]);
			k=0;
		
			for(l=0;l<=len;l++)
			{
				if(s[j][l]!=' '&& s[j][l]!='\0')
					temp[k++]=s[j][l];
				else 
				{
					 temp[k]='\0';
					 if(strcmp(temp,s1)==0)
						 num++;
					  k=0;
				}
			}
		}
		if(num==0) printf("Do not find\n");
		 else printf("%d\n",num);
	}
	

	return 0;
}

C++ :

#include <iostream>
#include <stdio.h>
#include <string.h>

using namespace std;

char t[25];
char f[105];
bool judge(){
	char word[105];int j = 0;
	int len = strlen(f);
	for (int i = 0; i <= len; i++){
		if(isalpha(f[i])){
			word[j++] = f[i];
		}
		else{
			word[j] = '\0';
			if(strcmp(t,word) == 0){
				return 1;
			}
			j = 0;
		}
	}
	return 0;
}
int main() {
	//freopen("zhaoweijie12.in", "r", stdin);
	//freopen("zhaoweijie12.out", "w", stdout);
	int tst,n,cnt;
	scanf("%d", &tst);
	for (int i = 1; i <= tst; i++){
		cnt = 0;
		scanf("%d", &n);getchar();
		gets(t);
		for (int j = 1; j <= n; j++){
			gets(f);
			if(judge()){
				cnt++;
			}
		}
		if(cnt == 0){
			puts("Do not find");
		}
		else{
			printf("%d\n", cnt);
		}
	}

  return 0;
} 

Java :

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
	
		int T,N;
		String word,sentence;
		
		Scanner in = new Scanner(System.in);
		T = in.nextInt();
		
		for(int i=0;i<T;i++){
			int sum = 0;
			N = in.nextInt();
			word = in.next();
			in.nextLine();
			for(int j=0;j<N;j++){
				sentence = in.nextLine();
				String[] str = sentence.split(" ");
				for(String s :str){
					if(s.equals(word)){
						sum++;
						break;
					}
				}
			}
			if(sum>0) System.out.println(sum);
			else System.out.println("Do not find");
		}
	}
}