朴素字符串匹配

#include<stdio.h>
int Index_1(char s[],int sLen,char p[],int pLen){//s为主串，sLen为主串元素个数，p为模式串，pLen为模式串的个数
    if(sLen<pLen)return 0;
    int i = 1,j = 1;
    while(i<=sLen && j<=pLen){
        if(s[i]==p[j]){i++;j++;}
        else{
            i = i-j+2;
            j = 1;
        }
    }
    if(j>pLen) return i-pLen;
    return 0;
}
void main(){
    char s[]={' ','a','b','c','a','b','a','a','a','a','b','a','a','b','c','a','c'};//从序号1开始存
    char p[]={' ','a','b','a','a','b','c','a','c'};
    int sLen = sizeof(s)/sizeof(char)-1;
    int pLen = sizeof(p)/sizeof(char)-1;
    printf("%d",Index_1(s,sLen,p,pLen));
}