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;
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2")
const int maxn=100000+10,maxq=300000+10,lg=20,sq=100,msq=maxn/sq+10;
int t,n,q;
long long inf=1e16;
vector<pair<int,int>>all[maxn];
vector<int>dp[maxn],lnk[lg][maxn],allp;
vector<long long>wlnk[lg][maxn];
long long res[msq][maxn];
vector<long long>allz[maxn];
void vorod(){
cin>>n>>t;
for(int i=1;i<n;i++){
int d;
cin>>d;
all[i].resize(d);
if(d>=sq){
allp.push_back(i);
}
for(int j=0;j<d;j++){
cin>>all[i][j].first>>all[i][j].second;
}
sort(all[i].begin(),all[i].end());
dp[i].resize(d);
for(int j=0;j<lg;j++){
lnk[j][i].resize(d);
wlnk[j][i].resize(d);
}
allz[i].resize(d);
}
cin>>q;
}
void callnk(){
for(int i=1;i<lg;i++){
for(int j=1;j<n-1;j++){
if((1<<i)+j>n){
continue;
}
for(int h=0;h<(int)all[j].size();h++){
lnk[i][j][h]=lnk[i-1][j+(1<<(i-1))][lnk[i-1][j][h]];
wlnk[i][j][h]=wlnk[i-1][j][h]+wlnk[i-1][j+(1<<(i-1))][lnk[i-1][j][h]];
}
}
}
}
void calresp(int z){
for(int i=1;i<n-1;i++){
for(int j=0;j<(int)all[i].size();j++){
//cout<<i<<" "<<j<<" "<<z<<" "<<allz[i][j]<<" "<<((all[i+1][lnk[0][i][j]].first-all[i][j].first)+t)%t<<"\n";
allz[i+1][lnk[0][i][j]]=min(allz[i+1][lnk[0][i][j]],allz[i][j]+wlnk[0][i][j]);
res[z][i+1]=min(res[z][i+1],allz[i][j]+dp[i][j]-all[i][j].first);
}
}
int i=n-1;
for(int j=0;j<(int)all[n-1].size();j++){
//cout<<z<<" "<<i<<" "<<j<<" "<<allz[i][j]<<" "<<dp[i][j]<<" wtf"<<endl;
res[z][i+1]=min(res[z][i+1],allz[i][j]+dp[i][j]-all[i][j].first);
}
}
void calp(){
int ted=0;
for(int i=1;i<n;i++){
if((int)all[i].size()<sq){
continue;
}
for(int j=1;j<=n;j++){
for(int h=0;h<(int)all[j].size();h++){
allz[j][h]=inf;
}
res[ted][j]=inf;
}
for(int j=0;j<(int)all[i].size();j++){
allz[i][j]=0;
}
res[ted][i]=0;
calresp(ted);
ted++;
}
}
void pre(){
for(int i=n-1;i>=1;i--){
int mn=t;
for(int j=(int)all[i].size()-1;j>=0;j--){
mn=min(all[i][j].second,mn);
dp[i][j]=mn;
}
}
for(int i=n-2;i>=1;i--){
for(int j=0;j<(int)all[i].size();j++){
if(all[i+1].back().first<dp[i][j]){
lnk[0][i][j]=0;
wlnk[0][i][j]=t-all[i][j].first+all[i+1][0].first;
continue;
}
int p=lower_bound(all[i+1].begin(),all[i+1].end(),make_pair(dp[i][j],-1))-all[i+1].begin();
lnk[0][i][j]=p;
wlnk[0][i][j]=all[i+1][p].first-all[i][j].first;
}
}
calp();
callnk();
}
long long boro(int ind,int r,int p){
long long ret=0;
if(ind==r){
return 0;
}
int dis=r-ind-1;
for(int i=lg-1;i>=0;i--){
if((dis>>i)&1){
ret+=wlnk[i][ind][p];
p=lnk[i][ind][p];
ind+=(1<<i);
}
}
ret+=dp[ind][p]-all[ind][p].first;
return ret;
}
void solve(){
for(int i=0;i<q;i++){
int l,r;
cin>>l>>r;
if((int)all[l].size()>=sq){
int p=lower_bound(allp.begin(),allp.end(),l)-allp.begin();
cout<<res[p][r]<<"\n";
continue;
}
long long ret=inf;
for(int i=0;i<(int)all[l].size();i++){
ret=min(ret,boro(l,r,i));
}
cout<<ret<<"\n";
}
}
int main(){
ios::sync_with_stdio(0);
cin.tie(0);
vorod();
pre();
solve();
}
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