Binary String Matching-----C語言解法與STL解法

時間限制:3000 ms  |  內存限制:65535 KB

難度:3

描述

Given two strings A and B, whose alphabet consist only ‘0’ and ‘1’. Your task is only to tell how many times does A appear as a substring of B? For example, the text string B is ‘1001110110’ while the pattern string A is ‘11’, you should output 3, because the pattern A appeared at the posit

輸入

The first line consist only one integer N, indicates N cases follows. In each case, there are two lines, the first line gives the string A, length (A) <= 10, and the second line gives the string B, length (B) <= 1000. And it is guaranteed that B is always longer than A.

輸出

For each case, output a single line consist a single integer, tells how many times do B appears as a substring of A.

樣例輸入

3
11
1001110110
101
110010010010001
1010
110100010101011 

樣例輸出

3
0
3 

來源

網絡

上傳者

naonao

題目大意:求第二個字符串中包含有幾個第一個字符串。

代碼如下:

(1)數組解法:

#include<stdio.h>

#include<string.h>

int main()

{

int n,i,j,k,x,y,a;

char s[1000],t[1000],ch[1000];

scanf("%d",&n);

while(n--)

{

k=a=0;

memset(ch,0,sizeof(ch));//(將ch(數組)的所有元素初始化爲0)

scanf("%s %s",s,t);

x=strlen(s);//(統計字符串中字符的個數)

y=strlen(t);

j=0;

for(i=0;i<y;i++)

{

ch[k++]=t[i];

ch[k]='\0';

if(k==x)

{

if(strcmp(ch,s)==0)//(比較兩個字符串)

a++;

i=j;

j++;

k=0;

}

}

printf("%d\n",a);

}

return 0;

}

(2)STL解法:

#include<string>
#include<iostream>
using namespace std;
int main()
{
    string s,m,ss;
    int n,a=0;
    cin>>n;
    while(n--)
    {
        a=0;
        cin >> s >> m;
        int x=s.length();
        int y=m.length();
        for(int i=0;i<y-x+1;i++)
        {
            ss=m.substr(i,x);//substr()函數,複製一個子字符串,從指定位置開始,並有指定長度
            if(s.compare(ss)==0)
                a++;
        }
        cout<<a<<endl;
    }
    return 0;
}

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