异或前缀和——cf1186C

#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <cstring>
#include <cctype>
#include <algorithm>
#include <cmath>

using namespace std;

typedef long long ll;
const int MAXN=1000005;

int n,m;
char a[MAXN],b[MAXN];
int sa[MAXN],sb[MAXN];

int main()
{
    #ifndef ONLINE_JUDGE
    //freopen("code.in","r",stdin);
    //freopen("code.out","w",stdout);
    #endif
    scanf("%s%s",a+1,b+1);
    n=strlen(a+1);m=strlen(b+1);
    for(int i=1;i<=n;i++)sa[i]=(a[i]-‘0‘)^sa[i-1];
    for(int i=1;i<=m;i++)sb[i]=(b[i]-‘0‘)^sb[i-1];
    int ans=0;
    for(int i=m;i<=n;i++)
        if(!(sb[m]^sa[i]^sa[i-m]))++ans;
    cout<<ans<<endl;
    return 0;
}