Submission #1266355

#	Time	Username	Problem	Language	Result	Execution time	Memory
1266355		syanvu	Railway Trip 2 (JOI22_ho_t4)	C++20	16 / 100	1080 ms	589824 KiB

Main

#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp> 
// #include <ext/pb_ds/tree_policy.hpp>

#define SS ios_base::sync_with_stdio(0);cin.tie(nullptr);cout.tie(nullptr);
#pragma optimize("g", on)
#pragma GCC optimize("03")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,avx2,mmx,fma,avx,tune=native")
#define int long long
#define all(x) x.begin(),x.end()
#define F first
#define S second


using namespace std;
// using namespace __gnu_pbds; 
// #define ordered_set tree<int,null_type,less_equal<int>,rb_tree_tag,tree_order_statistics_node_update>

const int LG = 21,N = 2e5+1,inf = 1e18,MOD = 998244353;
const double eps = 1e-9;
int T;

int n,k,m;

int lt[4*N],ladd[4*N],rt[4*N],radd[4*N];
int l[N][LG],r[N][LG],dpl[LG][N][LG],dpr[LG][N][LG];

void build(int v,int tl,int tr){
    lt[v]=ladd[v]=0;
    rt[v]=radd[v]=inf;
    if(tl==tr) return;
    int mid=(tl+tr)/2;
    build(v*2,tl,mid);
    build(v*2+1,mid+1,tr);
}
void push(int v,int tl,int tr){
    lt[v]=max(lt[v],ladd[v]);
    if(tl<tr){
        ladd[v*2]=max(ladd[v*2],ladd[v]);
        ladd[v*2+1]=max(ladd[v*2+1],ladd[v]);
    }
    ladd[v]=0;
    rt[v]=min(rt[v],radd[v]);
    if(tl<tr){
        radd[v*2]=min(radd[v*2],radd[v]);
        radd[v*2+1]=min(radd[v*2+1],radd[v]);
    }
    radd[v]=inf;
}
void lupd(int v,int tl,int tr,int l,int r,int x){
    push(v,tl,tr);
    if(tl>r || l>tr) return;
    if(tl>=l && r>=tr){
        ladd[v]=max(ladd[v],x);
        push(v,tl,tr);
        return;
    }
    int mid=(tl+tr)/2;
    lupd(v*2,tl,mid,l,r,x);
    lupd(v*2+1,mid+1,tr,l,r,x);
    lt[v]=max(lt[v*2],lt[v*2+1]);
}
void rupd(int v,int tl,int tr,int l,int r,int x){
    push(v,tl,tr);
    if(tl>r || l>tr) return;
    if(tl>=l && r>=tr){
        radd[v]=min(radd[v],x);
        push(v,tl,tr);
        return;
    }
    int mid=(tl+tr)/2;
    rupd(v*2,tl,mid,l,r,x);
    rupd(v*2+1,mid+1,tr,l,r,x);
    rt[v]=min(rt[v*2],rt[v*2+1]);
}
int lget(int v,int tl,int tr,int pos){
    push(v,tl,tr);
    if(tl==tr) return lt[v];
    int mid=(tl+tr)/2;
    if(mid>=pos) return lget(v*2,tl,mid,pos);
    else return lget(v*2+1,mid+1,tr,pos);
}
int rget(int v,int tl,int tr,int pos){
    push(v,tl,tr);
    if(tl==tr) return rt[v];
    int mid=(tl+tr)/2;
    if(mid>=pos) return rget(v*2,tl,mid,pos);
    else return rget(v*2+1,mid+1,tr,pos);
}

void solve() {
    cin>>n>>k>>m;
    int a[m+1],b[m+1];
    build(1,1,n);
    for(int i=1;i<=m;i++){
        cin>>a[i]>>b[i];
        if(a[i]<b[i]) lupd(1,1,n,a[i],min(a[i]+k-1,b[i]-1),b[i]);
        else rupd(1,1,n,max(a[i]-k+1,b[i]+1),a[i],b[i]);
    }
    for(int i=1;i<=n;i++){
        int L=rget(1,1,n,i),R=lget(1,1,n,i);
        l[i][0]=min(L,i);
        r[i][0]=max(R,i);
    }
    auto getmn = [&](int t,int l,int r){
        int lg=log2(r-l+1);
        return min(dpl[t][l][lg],dpl[t][r-(1ll<<lg)+1][lg]);
    };
    auto getmx = [&](int t,int l,int r){
        int lg=log2(r-l+1);
        return max(dpr[t][l][lg],dpr[t][r-(1ll<<lg)+1][lg]);
    };


    for(int lg=0;lg<LG;lg++){
        if(lg){
            for(int i=1;i<=n;i++){
                l[i][lg]=getmn(lg-1,l[i][lg-1],r[i][lg-1]);
                r[i][lg]=getmx(lg-1,l[i][lg-1],r[i][lg-1]);
            }
        }
        for(int i=1;i<=n;i++){
            dpl[lg][i][0]=l[i][lg];
            dpr[lg][i][0]=r[i][lg];
        }
        for(int j=1;j<LG;j++){
            for(int i=1;i+(1ll<<j)-1<=n;i++){
                dpl[lg][i][j]=min(dpl[lg][i][j-1],dpl[lg][i+(1ll<<(j-1))][j-1]);
                dpr[lg][i][j]=max(dpr[lg][i][j-1],dpr[lg][i+(1ll<<(j-1))][j-1]);
            }
        }
    }
    int q;
    cin>>q;
    while(q--){
        int s,t;
        cin>>s>>t;
        int L=s,R=s;
        int ans=0;
        for(int i=20;i>=0;i--){
            int _l=getmn(i,L,R);
            int _r=getmx(i,L,R);
            if(_l>t || _r<t){
                L=_l;
                R=_r;
                ans+=(1ll<<i);
            }
        }
        cout<<(ans+1>n ? -1 : ans+1)<<'\n';
    }
    
    return;
}
signed main() {
    //   freopen("deleg.in","r",stdin);    
    // freopen("deleg.out","w",stdout);
    SS
    int t = 1;
    if (T) {
        cin >> t;
    }
    while (t--) {
        solve();
    }
}
/*


*/

• Subtask 1: 8 / 8
• Subtask 2: 8 / 8
• Subtask 3: 0 / 11
• Subtask 4: 0 / 25
• Subtask 5: 0 / 35
• Subtask 6: 0 / 13