#include<bits/stdc++.h>
using namespace std;
#define ll long long
const int N=2e5+5;
int n,q;
ll a[N];
char s[N],t[N];

int len[N];
ll sum[N];
ll f[N];

int nxt[N];
void kmp() {
    int j=0;nxt[1]=0;f[1]=a[1];
    for(int i=2;i<=n;i++) {
        f[i]=a[i]-a[i-1];
        while(j&&s[j+1]!=s[i]) j=nxt[j];
        if(s[j+1]==s[i]) j++;
        nxt[i]=j;
        f[i]+=f[j];
    }
    for(int i=1;i<=n;i++) f[i]+=f[i-1];
    // cerr<<"---------------------------\n";
    // cerr<<"f : "<<endl;
    // for(int i=1;i<=n;i++) {
    //     cerr<<"f["<<i<<"] = "<<f[i]<<endl;
    // }
    return;
}
void exkmp() {
    int p=0,k=2;
    nxt[1]=n;
    while(s[1+nxt[2]]==s[2+nxt[2]]) nxt[2]++;
    p=2+nxt[2]-1;
    for(int i=3;i<=n;i++) {
        int l=nxt[1+i-k];
        if(l+i<=p) nxt[i]=l;
        else {
            nxt[i]=max(0,p-i+1);
            while(s[1+nxt[i]]==s[i+nxt[i]]) nxt[i]++;
        }
        if(i+nxt[i]-1>p) p=i+nxt[i]-1,k=i;
    }

    // cerr<<"---------------------------\n";
    // cerr<<"len : "<<endl;
    // for(int i=1;i<=n;i++) {
    //     cerr<<"nxt["<<i<<"] = "<<nxt[i]<<endl;
    // }
//-------------------------------------------

    p=0,k=1;
    len[1]=0;
    while(s[1+len[1]]==t[1+len[1]]) len[1]++;
    p=1+len[1]-1;
    for(int i=2;i<=n;i++) {
        int l=nxt[1+i-k];
        if(l+i<=p) len[i]=l;
        else {
            len[i]=max(0,p-i+1);
            while(s[1+len[i]]==t[i+len[i]]) len[i]++;
        }
        if(i+len[i]-1>p) p=i+len[i]-1,k=i;
    }
    return;
}

int st[N][25],lg[N];
void init() {
    exkmp();
    // cerr<<"---------------------------\n";
    // cerr<<"len : "<<endl;
    for(int i=1;i<=n;i++) {
        sum[i]=sum[i-1]+a[len[i]];
        st[i][0]=i+len[i]-1;
        // cerr<<"len["<<i<<"] = "<<len[i]<<endl;
    }
    lg[0]=-1;
    for(int i=1;i<=n;i++) lg[i]=lg[i>>1]+1;
    for(int k=1;k<=lg[n];k++) {
        for(int i=1;i+(1<<k)-1<=n;i++) {
            st[i][k]=max(st[i][k-1],st[i+(1<<(k-1))][k-1]);
        }
    }
    kmp();
    return;
}
int ask(int l,int r) {
    int len=lg[r-l+1];
    return max(st[l][len],st[r-(1<<len)+1][len]);
}
int calc(int L,int R) {
    int l=L,r=R,ans=L-1,mid;
    while(l<=r) {
        mid=(l+r)>>1;
        if(ask(l,mid)<r) {
            ans=mid;
            l=mid+1;
        }
        else r=mid-1;
    }
    return ans;
}
int main() {
    scanf("%d%d",&n,&q);
    scanf("%s",s+1);
    scanf("%s",t+1);
    for(int i=1;i<=n;i++) scanf("%d",&a[i]),a[i]+=a[i-1];
    init();
    while(q--) {
        int l,r;scanf("%d%d",&l,&r);
        int pos=calc(l,r);
        // cerr<<"pos = "<<pos<<endl;
        // cerr<<"sum ["<<l<<", "<<pos<<"] = "<<sum[pos]-sum[l-1]<<" ,  "<<"pre ["<<pos+1<<", "<<r<<"] = "<<f[r-pos]<<endl;
        ll ans=sum[pos]-sum[l-1];
        if(r>=pos) ans+=f[r-pos];
        // printf("ans = %lld\n",ans);
        printf("%lld\n",ans);
    }
    return 0;
}
/*
8 5
abbabaab
aababbab
1 2 4 8 16 32 64 128
1 1
2 3
3 5
4 7
1 8


15 4
heheheheehhejie
heheheheheheheh
3 1 4 1 5 9 2 6 5 3 5 8 9 7 9
2 3
4 8
2 6
1 15
*/