哈希UVALive 6326 Contest Hall Preparation

Encrypting passwords is one of the most important problems nowadays, and you trust only the encryp-

tion algorithms which you invented, and you have just made a new encryption algorithm.

Given a password which consists of only lower case English letters, your algorithm encrypts this

password using the following 3 steps (in this given order):

Swap two different characters of the given password (you can do this step zero or more times).

Append zero or more lower case English letters at the beginning of the output of step one.

Append zero or more lower case English letters to the end of the output of step two.

And the encrypted password is the output of step three.

You have just nished implementing the above algorithm and applied it on many passwords. Now

you want to make sure that there are no bugs in your implementation, so you decided to write another

program which validates the output of the encryption program. Given the encrypted password and the

original password, your job is to check whether the encrypted password may be the result of applying

your algorithm on the original password or not.

Input

Your program will be tested on one or more test cases. The rst line of the input will be a single

integer

, the number of test cases (1

100). Followed by the test cases, each test case is on two

lines. The rst line of each test case contains the encrypted password. The second line of each test case

contains the original password. Both the encrypted password and the original password are at least 1

and at most 100,000 lower case English letters (from `

' to `

'), and the length of the original password

is less than or equal the length of the encrypted password.

Output

For each test case, print on a single line one word, `

YES

' (without the quotes) if applying the algorithm on

the original password may generate the encrypted password, otherwise print `

' (without the quotes).

SampleOutput

abcdef

ecd

cde

ecd

abcdef

fed

SampleOutput

YES

NO//有坑

#include<stdio.h>

#include<string.h>

#include<iostream>

#include<algorithm>

using namespace std;

const int maxn=;

int hash[maxn];

int cur[maxn];

char s[],t[];

int h[];

int main()

{

    int T;

    scanf("%d",&T);

    getchar();

    while(T--)

    {

        memset(h,,sizeof(h));

        memset(hash,,sizeof(hash));

        memset(cur,,sizeof(cur));

        memset(t,,sizeof(t));

        memset(s,,sizeof(s));

        scanf("%s",t);

        getchar();

        scanf("%s",s);

        getchar();

        int len1=strlen(s);

        int len2=strlen(t);

        for(int i=; i<len1; i++)

        {

            int temp=s[i];

            hash[temp]++;

        }

        int ans=;

        int cnt=;

        bool flag=false;

        if(len1==len2)

        {

            for(int i=; i<len2; i++)

            {

                int d=t[i];

                h[i]=d;

                if(cur[d]<hash[d])

                    cnt++;

                cur[d]++;

                if(cnt==len1){

                    flag=true;

                      break;

                    }

            }

        }

        else

        {

            for(int i=; i<len2; i++)

            {

                int d=t[i];

                h[i]=d;

                if(cur[d]<hash[d])

                    cnt++;

                cur[d]++;

                if(i>=len1)

                {

                    d=h[i-len1];

                    if(cur[d]<=hash[d])

                        cnt--;

                    cur[d]--;

                }

                if(cnt==len1){

                    flag=true;

                      break;

                    }

            }

        }

        if(flag)

            printf("YES\n");

        else

            printf("NO\n");

    }

    return ;

}

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哈希UVALive 6326 Contest Hall Preparation

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