字符串最大跨距

#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cmath>
#include<cstring>
#include<string>
#include<algorithm>
using namespace std;
int main() {
char s[1000],s1[20],s2[20],c;
int l=0,l1=0,l2=0;
while((c=getchar())&&c!=',') s[l++]=c;
while((c=getchar())&&c!=',') s1[l1++]=c;
while((c=getchar())&&c!=EOF) s2[l2++]=c;
int i,j=l2-2,k=0,t=0;
for(i=0; i<l; i++){
if(s[i]==s1[k]) k++;
else k=0;
if(k==l1){
t-=i+1;
break;
}
}
for(i=l-1; i>=0; i--){
if(s[i]==s2[j]) j--;
else j=l2-2;
if(j==0) {
t+=i-1;
break;
}
}

if(t>=0) printf("%d",t);
else printf("-1");
return 0;
}