/*
In the name of Allah
made by: Ahmed_Solyman
*/
#include <bits/stdc++.h>
#include <ext/rope>
using namespace std;
using namespace __gnu_cxx;
#pragma GCC optimize("-Ofast")
#pragma GCC optimize("-O1")
//-------------------------------------------------------------//
typedef long long ll;
typedef unsigned long long ull;
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define PI acos(-1)
#define lb lower_bound
#define ub upper_bound
#define endl '\n'
#define all(v) v.begin(),v.end()
#define allr(v) v.rbegin(),v.rend()
#define sum_to(n) (n*(n+1))/2
#define pb push_back
#define pf push_front
#define fil(arr,x) memset(arr,x,sizeof(arr))
const ll mod=1e9+7;
int dx[8]={0,1,0,-1,1,1,-1,-1};
int dy[8]={1,0,-1,0,1,-1,-1,1};
//-------------------------------------------------------------//
ll lcm(ll a,ll b)
{
return (max(a,b)/__gcd(a,b))*min(a,b);
}
void person_bool(bool x)
{
cout<<(x?"YES":"NO")<<endl;
}
const int N=2e5+5;
int l[N],r[N],dp[N][21];
struct segtree{
vector<int>tree,lazy;
int size;
void init(int n){
size=n;
tree.assign(n*4+5,1e9);
lazy.assign(n*4+5,-1);
}
void push_lazy(int l,int r,int p){
if(~lazy[p]){
tree[p]=lazy[p];
if(l!=r){
tree[p*2]=lazy[p];
tree[p*2+1]=lazy[p];
}
lazy[p]=-1;
}
}
void set(int l,int r,int p,int lq,int rq,int v){
push_lazy(l,r,p);
if(l>=lq && r<=rq){
tree[p]=v;
if(l!=r){
lazy[p*2]=lazy[p*2+1]=v;
}
return;
}
if(r<lq || l>rq){
return;
}
int mid=(l+r)/2;
set(l,mid,p*2,lq,rq,v);
set(mid+1,r,p*2+1,lq,rq,v);
tree[p]=min(tree[p*2],tree[p*2+1]);
}
void set(int l,int r,int v){
set(1,size,1,l,r,v);
}
int query(int l,int r,int p,int l_q,int r_q){
push_lazy(l,r,p);
if(l>=l_q && r<=r_q){
return tree[p];
}
if(r<l_q || l>r_q){
return 1e9;
}
int mid=(l+r)/2;
return min(query(l,mid,p*2,l_q,r_q),query(mid+1,r,p*2+1,l_q,r_q));
}
int query(int l,int r){
return query(1,size,1,l,r);
}
};
int main()
{
//freopen("input.txt","r",stdin);
//freopen("output.txt","w",stdout);
#ifndef ONLINE_JUDGE
freopen("input.in", "r", stdin);
freopen("output.out", "w", stdout);
#endif
fast
int n;cin>>n;
vector<int>v;
for(int i=1;i<=n;i++){
cin>>l[i]>>r[i];
v.push_back(l[i]);
v.push_back(r[i]);
}
sort(all(v));
int cnt=1;
unordered_map<int,int>mp;
for(auto i:v){
mp[i]=cnt++;
}
for(int i=1;i<=n;i++){
l[i]=mp[l[i]];
r[i]=mp[r[i]];
}
cnt++;
segtree s;
s.init(4e5+5);
for(int i=n;i>=1;i--){
int x=n+1;
for(int j=i+1;j<=n;j++){
if(!(l[j]>r[i] || r[j]<l[i])){
x=j;
break;
}
}
dp[i][0]=s.query(l[i],r[i]);
dp[i][0]=min(dp[i][0],n+1);
if(i<n)dp[i][0]=min(dp[i][0],dp[i+1][0]);
s.set(l[i],r[i],i);
assert(x==dp[i][0]);
}
dp[n+1][0]=n+1;
for(int j=1;j<=20;j++){
for(int i=1;i<=n+1;i++){
dp[i][j]=dp[dp[i][j-1]][j-1];
}
}
int q;cin>>q;
while(q--){
int a,b;cin>>a>>b;
int ans=1;
for(int i=20;i>=0;i--){
if(dp[a][i]<=b){
a=dp[a][i];
ans+=(1<<i);
}
}
cout<<ans<<endl;
}
return 0;
}
Compilation message
Main.cpp: In function 'int main()':
Main.cpp:98:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
98 | freopen("input.in", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:99:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
99 | freopen("output.out", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
5 ms |
13144 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
5 ms |
13144 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
5 ms |
13144 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
5 ms |
13148 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
5 ms |
13144 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
