“Sgu/506”的版本间的差异

#include<cstdio>
#include<string>
#include<iostream>
#include<algorithm>
using namespace std;
#define si(n) scanf("%d",&n)
#define ci const int &
#define lld unsigned long long
#define dsi(n) int n;si(n)
#define f(i,n) for(int i=1;i<=n;++i)
#define fi(i,p,n) for(int i=p;i<=n;++i)
#define fd(i,n) for(int i=n;i!=0;--i)
#define fdi(i,p,n) for(int i=n;i>=p;--i)
int main()
{
    string s1,s2;
    cin>>s1>>s2;
    lld last=-1,ans=0;
    fi(i,0,s1.size()-1)
    {
        if(s1[i]==s2[0])
        {
            int p=0;
            fi(j,i,s1.size()-1)
                if(s1[j]==s2[p])
                    if(++p==s2.size())
                    {
                        ans+=(lld)(s1.size()-j)*(i-last);
                        last=i;
                        break;
                    }
        }
    }
    cout<<ans;
    return 0;
}