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>
#define fi first
#define se second
#define ll long long
using namespace std ;
const int N = 2e5 ;
int n, q, l[N + 1], r[N + 1], x[N + 1] ;
int main()
{
ios_base::sync_with_stdio( 0 ) ;
cin.tie( 0 ) ;
cout.tie( 0 ) ;
cin >> n ;
for(int i = 1 ; i <= n ; i++)
cin >> l[i] >> r[i] ;
cin >> q ;
for(int i = 1 ; i <= q ; i++)
cin >> x[i] ;
if(q == 1 && n <= 300)
{
int ans[n + 1][n + 1] ;
for(int i = 1 ; i <= n ; i++)
for(int j = 1 ; j <= n ; j++)
ans[i][j] = 1e9 ;
set<pair<int, pair<int, int>>> s ;
s.insert({1, {l[x[1]], r[x[1]]}}) ;
ans[l[x[1]]][r[x[1]]] = 1 ;
while(s.size())
{
auto j = *s.begin() ;
int cnt = j.fi, ln = j.se.fi, rn = j.se.se ;
s.erase(j) ;
if(cnt > ans[ln][rn])
continue ;
for(int q = ln ; q <= rn ; q++)
{
int lch = min(ln, l[q]), rch = max(rn, r[q]), cntch = cnt + 1 ;
if(cntch < ans[lch][rch])
{
ans[lch][rch] = cntch ;
s.insert({cntch, {lch, rch}}) ;
}
}
}
if(ans[1][n] == 1e9)ans[1][n] = -1 ;
cout << ans[1][n] ;
return 0 ;
}
if(q == 1 && x[1] == 1)
{
int ans = 0, mx = r[1], ind = 1 ;
while(ind < n)
{
int mx1 = 0 ;
for(int j = ind ; j <= mx ; j++)
mx1 = max(mx1, r[j]) ;
ans++ ;
ind = mx ;
if(mx1 == mx)
break ;
mx = max(mx1, mx) ;
}
if(ind < n)
ans = -1 ;
cout << ans ;
return 0 ;
}
return 0 ;
}
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