This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define int long long
const int MOD = 1e9+7;
struct node
{
int cnt[2][2];//daca e egal si il face mai mic acum
int deja[2][2];//daca e deja mai mic
int lun;
bool has13;
int vle,vri;
};
node combine(node x, node y)
{
if(x.lun==-1)
return y;
if(y.lun==-1)
return x;
///1 - periculos
node aux;
aux.lun = x.lun + y.lun;
aux.vle = x.vle;
aux.vri = y.vri;
aux.has13 = (x.has13 | y.has13);
if(x.vri==1 && y.vle==3) aux.has13=1;
for(int i=0;i<2;i++)
for(int j=0;j<2;j++)
aux.cnt[i][j]=aux.deja[i][j]=0;
for(int i=0;i<2;i++)
{
for(int j=0;j<2;j++)
{
aux.deja[i][j] += (x.deja[i][0]*(y.deja[0][j]+y.deja[1][j]) + x.deja[i][1]*y.deja[0][j])%MOD;
aux.cnt[i][j] += (x.cnt[i][0]*(y.deja[0][j]+y.deja[1][j]) + x.cnt[i][1]*y.deja[0][j])%MOD;
}
if(!x.has13)
{
if(x.vle==3)
{
if(x.vri==1)
aux.cnt[1][i] += y.cnt[0][i];
else
aux.cnt[1][i] += y.cnt[0][i] + y.cnt[1][i];
}
else
{
if(x.vri==1)
aux.cnt[0][i] += y.cnt[0][i];
else
aux.cnt[0][i] += y.cnt[0][i] + y.cnt[1][i];
}
}
}
for(int i=0;i<2;i++)
for(int j=0;j<2;j++)
aux.cnt[i][j]%=MOD, aux.deja[i][j]%=MOD;
return aux;
}
node fa_nod(int cif)
{
node aux;
aux.lun = 1;
aux.vle = aux.vri = cif;
aux.has13 = 0;
for(int i=0;i<2;i++)
for(int j=0;j<2;j++)
aux.cnt[i][j] = aux.deja[i][j] = 0;
for(int i=0;i<10;i++)
{
if(i==1)
aux.deja[0][1]++;
else if(i==3)
aux.deja[1][0]++;
else
aux.deja[0][0]++;
if(i < cif)
{
if(i==1)
aux.cnt[0][1]++;
else if(i==3)
aux.cnt[1][0]++;
else
aux.cnt[0][0]++;
}
}
return aux;
}
node emp = {{{-1,-1},{-1,-1}},{{-1,-1},{-1,-1}},-1,0,-1,-1};
node aint[270000];
void upd(int nod, int st, int dr, int poz, int newv)
{
if(st==dr)
{
aint[nod] = fa_nod(newv);
return;
}
int mij=(st+dr)/2;
if(poz<=mij) upd(nod*2,st,mij,poz,newv);
else upd(nod*2+1,mij+1,dr,poz,newv);
aint[nod] = combine(aint[nod*2], aint[nod*2+1]);
}
node qry(int nod, int st, int dr, int le, int ri)
{
if(le>ri)
return emp;
if(le==st && dr==ri)
return aint[nod];
int mij=(st+dr)/2;
return combine(qry(nod*2,st,mij,le,min(mij,ri)), qry(nod*2+1,mij+1,dr,max(mij+1,le),ri));
}
int n,q;
int a[100005];
void afis(int x, int y)
{
node aux = qry(1,1,n,x,y);
int rez=0;
for(int i=0;i<2;i++)
for(int j=0;j<2;j++)
rez = (rez + aux.cnt[i][j])%MOD;
if(!aux.has13) rez = (rez+1)%MOD;
cout<<rez<<"\n";
}
signed main()
{
ios_base::sync_with_stdio(0);cin.tie(0);
cin>>n>>q;
char ch;
for(int i=1;i<=n;i++)
{
cin>>ch;
a[i] = ch-'0';
upd(1,1,n,i,a[i]);
}
afis(1,n);
int tip,x,y;
while(q--)
{
cin>>tip>>x>>y;
if(tip==1)
{
afis(x,y);
}
else
{
upd(1,1,n,x,y);
}
}
return 0;
}
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