NYOJ NO.5 Binary String Matching

#include<stdio.h>#include<string.h>int main(){    int n;    scanf("%d", &n);    while(n--)    {        char a[15], b[1005], c[15];        int lenga, lengb, i , j ,k, sum = 0;        scanf("%s", a);        scanf("%s", b);        lenga = strlen(a);        lengb = strlen(b);        for(i = 0; i <= lengb - lenga; i++)        {            for(j = 0; j< lenga; j++)                c[j] = b[i+j];            c[j] = '\0';            if(!strcmp(a ,c))                sum++;        }        printf("%d\n",sum);    }    return 0;}