Submission #955362

#	Time	Username	Problem	Language	Result	Execution time	Memory
955362		amine_aroua	Railway Trip 2 (JOI22_ho_t4)	C++17	100 / 100	708 ms	121440 KiB

Main

#include <bits/stdc++.h>
//#pragma GCC optimize("O3")
//#pragma GCC optimize("unroll-loops")
using namespace std;
#define int long long
#define vi vector<int>
#define vl vector<long long>
#define vii vector<pair<int,int>>
#define vll vector<pair<long long,long long>>
#define pb push_back
#define ll long long
#define ld long double
#define nl '\n'
#define boost ios::sync_with_stdio(false)
#define mp make_pair
#define se second
#define fi first
#define fore(i, y) for(int i = 0; i < y; i++)
#define forr(i,x,y) for(int i = x;i<=y;i++)
#define forn(i,y,x) for(int i = y; i >= x; i--)
#define all(v) v.begin(),v.end()
#define sz(v) (int)v.size()
#define clr(v,k) memset(v,k,sizeof(v))
#define rall(v) v.rbegin() , v.rend()
#define pii pair<int,int>
#define pll pair<ll , ll>

const ll MOD = 1e9 + 7;
const ll INF = 1e18 + 1;

ll gcd(ll a , ll b) {return b ? gcd(b , a % b) : a ;} // greatest common divisor (gcd)
ll lcm(ll a , ll b) {return a * (b / gcd(a , b));} // least common multiple (lcm)

// HERE IS THE SOLUTION
vi mxTree , mnTree ;
int n;

pii comb(pii a , pii b)
{
    return {min(a.fi , b.fi) , max(a.se , b.se)};
}
void build()
{
    while(__builtin_popcount(n) != 1)
        n++;
    mxTree.assign(2*n , 0);
    mnTree.assign(2*n , n + 1);
}
void upd(int node , int L , int R , int l , int  r , int x , bool type)
{
    if(l <= L && R <= r)
    {
        if(!type)
            mxTree[node] = max(mxTree[node] , x);
        else
            mnTree[node] = min(mnTree[node] , x);
        return ;
    }
    if(l > R || L > r)
        return ;
    int mid = (L + R)/2;
    upd(2*node , L , mid , l , r , x ,  type);
    upd(2*node + 1 , mid + 1 , R , l , r , x , type);
}
int getMax(int i)
{
    int ans = i;
    for(int j = (i + n); j>= 1;j/=2)
    {
        ans = max(ans , mxTree[j]);
    }
    return ans;
}
int getMin(int i)
{
    int ans = i;
    for(int j = (i + n); j>= 1;j/=2)
    {
        ans = min(ans , mnTree[j]);
    }
    return ans;
}
struct
{
    vii tree;
    int lim;
    void init(int N , vii a)
    {
        lim = N + 1;
        while(__builtin_popcount(lim) != 1)
        {
            a.pb({INF , -INF});
            lim++;
        }
        tree.resize(2*lim);
        forr(i , 0 , lim - 1)
        {
            tree[i + lim] = a[i];
        }
        forn(i , lim - 1 ,0)
        {
            tree[i] = comb(tree[2*i] , tree[2*i +1 ]);
        }
    }
    pii query(int node , int L , int R , int l , int r)
    {
        if(l <= L && R <= r)
        {
            return tree[node];
        }
        if(l > R || L > r)
            return {INF , -INF};
        int mid = (L + R)/2;
        return comb(query(2*node , L , mid , l , r) , query(2*node+ 1 , mid + 1 , R , l , r));
    }
    pii query(int l , int r)
    {
        return query(1 , 0 , lim - 1 , l , r);
    }
} tree[20];



signed main()
{
    boost;
    cin.tie(0);
    cout.tie(0);
    int N , K , M;
    cin>>N>>K>>M;
    n = N +1;
    build();
    vector<vector<pii>> adj(20, vii(N + 1));
    forr(i , 1  , N)
    {
        adj[0][i] = {i , i};
    }
    fore(i , M)
    {
        int A , B;
        cin>>A>>B;
        if(A < B)
        {
            upd(1 , 0 , n - 1 , A , min(B - 1 , A + K - 1) , B , 0);
        }
        else
        {
            upd(1 , 0 , n - 1 , max(B + 1 , A - K + 1) , A , B , 1);
        }
    }
    forr(i , 1 , N)
    {
        adj[0][i].first = getMin(i);
        adj[0][i].second = getMax(i);
    }
    forr(lg , 1 , 19)
    {
        tree[lg - 1].init(N , adj[lg - 1]);
        forr(i , 1 , N)
        {
            adj[lg][i] = tree[lg - 1].query(adj[lg - 1][i].first , adj[lg- 1][i].second);
        }
    }
    int Q;
    cin>>Q;
    while(Q--)
    {
        int S , T;
        cin>>S>>T;
        int ans = 0;
        pii cur = {S , S};
        forn(i , 18 , 0)
        {
            pii ncur = tree[i].query(cur.first , cur.second);
            if(ncur.first <= T && T <= ncur.second)
                continue;
            cur = ncur ;
            ans+=(1<<i);
        }
        if(ans >= 524287)
            cout<<-1<<nl;
        else
            cout<<ans + 1<<nl;
    }
}

• Subtask 1: 8 / 8
• Subtask 2: 8 / 8
• Subtask 3: 11 / 11
• Subtask 4: 25 / 25
• Subtask 5: 35 / 35
• Subtask 6: 13 / 13