Submission #862717

#	Time	Username	Problem	Language	Result	Execution time	Memory
862717		Ahmed_Solyman	Osumnjičeni (COCI21_osumnjiceni)	C++14	0 / 110	6 ms	9052 KiB

Main

/*
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],Log[N],l2[N],r2[N];
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
    Log[1]=0;
    for(int i=2;i<N;i++)Log[i]=Log[i/2]+1;
    int n;cin>>n;
	set<int>s;
    for(int i=1;i<=n;i++){
    	cin>>l[i]>>r[i];
    	s.insert(l[i]);
    	s.insert(r[i]);
    	l2[i]=l[i];
    	r2[i]=r[i];
    }
    int cnt=0;
    map<int,int>mp;
    for(auto i:s){
    	mp[i]=cnt++;
    }
    for(int i=1;i<=n;i++){
    	l[i]=mp[l2[i]];
    	r[i]=mp[r2[i]];
    }
    dp[n+1][0]=n+1;
    for(int j=1;j<=20;j++){
    	dp[n+1][j]=n+1;
    	for(int i=1;i<=n;i++){
    		dp[i][j]=dp[dp[i][j-1]][j-1];
    	}
    }
    int q;cin>>q;
    while(q--){
    	int a,b;cin>>a>>b;
    	if(a==b){
    		cout<<1<<endl;
    		continue;
    	}
    	int ans=1;
    	for(int j=20;j>=0;j--){
    		if(dp[a][j]<=b){
    			a=dp[a][j];
    			ans+=1<<j;
    		}
    	}
    	cout<<ans<<endl;
    }
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:45:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |     freopen("input.in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:46:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |     freopen("output.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 50