Submission #1163015

#	Time	Username	Problem	Language	Result	Execution time	Memory
1163015		guagua0407	Escape Route 2 (JOI24_escape2)	C++20	54 / 100	1421 ms	461504 KiB

Main

//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

int dx[4]={0,0,1,-1};
int dy[4]={1,-1,0,0};

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

const int mxn=1e5+5;
const int B=400;
int n,T;
const ll inf=(ll)1e18;
const int inf2=1e9+5;

bool comp(pair<int,int> x,pair<int,int> y){
    if(x.f!=y.f) return x.f<y.f;
    return x.s>y.s;
}

bool comp2(pair<int,int> x,pair<int,int> y){
    if(x.f!=y.f) return x.f>y.f;
    return x.s<y.s;
}

int main() {_
    cin>>n>>T;
    vector<vector<pair<int,int>>> a(n);
    vector<vector<pair<int,int>>> b(n);
    vector<int> m(n);
    vector<int> mnn(n,inf2);
    for(int i=1;i<n;i++){
        cin>>m[i];
        for(int j=0;j<m[i];j++){
            int l,r;
            cin>>l>>r;
            a[i].push_back({l,r});
            mnn[i]=min(mnn[i],r-l);
        }
        {
            sort(all(a[i]),comp);
            vector<pair<int,int>> tmp;
            for(auto v:a[i]){
                while(!tmp.empty() and tmp.back().s>=v.s){
                    tmp.pop_back();
                }
                tmp.push_back(v);
            }
            swap(tmp,a[i]);
        }
        b[i]=a[i];
        for(auto &v:b[i]){
            swap(v.f,v.s);
        }
        m[i]=(int)a[i].size();
    }
    vector<vector<vector<ll>>> sum(n);
    vector<vector<vector<int>>> nxt(n);
    vector<vector<int>> to(n);
    for(int i=1;i<n;i++){
        to[i]=vector<int>((int)a[i].size(),-1);
        if(i==n-1) break;
        for(int j=0;j<(int)a[i].size();j++){
            to[i][j]=lower_bound(all(a[i+1]),make_pair(a[i][j].s,0))-a[i+1].begin();
        }
    }
    for(int i=1;i<n;i++){
        sum[i]=vector<vector<ll>>(m[i],vector<ll>(20));
        nxt[i]=vector<vector<int>>(m[i],vector<int>(20));
        for(int j=0;j<m[i];j++){
            sum[i][j][0]=a[i][j].s-a[i][j].f;
            nxt[i][j][0]=j;
        }
    }
    for(int k=1;k<20;k++){
        for(int i=1;i+(1<<k)<=n;i++){
            for(int j=0;j<m[i];j++){
                int t=to[i+(1<<(k-1))-1][nxt[i][j][k-1]];
                ll tmp=0;
                if(t==(int)a[i+(1<<(k-1))].size()){
                    t=0;
                    tmp+=T;
                }
                nxt[i][j][k]=nxt[i+(1<<(k-1))][t][k-1];
                sum[i][j][k]=sum[i][j][k-1]+sum[i+(1<<(k-1))][t][k-1]+(a[i+(1<<(k-1))][t].f-a[i+(1<<(k-1))-1][nxt[i][j][k-1]].s)+tmp;
                //cout<<i<<' '<<j<<' '<<k<<' '<<sum[i][j][k]<<'\n';
            }
        }
    }
    vector<vector<vector<ll>>> sum2(n);
    vector<vector<vector<int>>> nxt2(n);
    vector<vector<ll>> ansbig(n);
    for(int i=1;i<n;i++){
        if((int)a[i].size()<=B) continue;
        int sz=(int)a[i].size();
        sum2[i]=vector<vector<ll>>(sz,vector<ll>(B+1));
        nxt2[i]=vector<vector<int>>(sz,vector<int>(B+1));
        ansbig[i]=vector<ll>(B+1,inf);
        for(int j=0;j<sz;j++){
            sum2[i][j][1]=a[i][j].s-a[i][j].f;
            nxt2[i][j][1]=j;
            ansbig[i][1]=min(ansbig[i][1],sum2[i][j][1]);
            for(int k=2;k<=B and i+k<=n;k++){
                int t=to[i+k-2][nxt2[i][j][k-1]];
                ll tmp=0;
                if(t==(int)a[i+k-1].size()){
                    t=0;
                    tmp+=T;
                }
                nxt2[i][j][k]=t;
                sum2[i][j][k]=sum2[i][j][k-1]+(a[i+k-1][t].f-a[i+k-2][nxt2[i][j][k-1]].s)+tmp;
                ansbig[i][k]=min(ansbig[i][k],sum2[i][j][k]);
            }
        }
    }
    int q;
    cin>>q;
    for(int t=0;t<q;t++){
        int l,r;
        cin>>l>>r;
        if(l+1==r){
            cout<<mnn[l]<<'\n';
            continue;
        }
        int pos=-1;
        for(int i=l;i<r;i++){
            if((int)a[i].size()<=B){
                pos=i;
                break;
            }
        }
        if(pos==-1){
            cout<<ansbig[l][r-l]<<'\n';
            continue;
            //pos=r-1;
        }
        ll mn=inf;
        int sz=(int)a[pos].size();
        for(int i=0;i<sz;i++){
            int cur=pos;
            int id=i;
            ll ans=0;
            for(int k=19;k>=0;k--){
                if(cur+(1<<k)>r) continue;
                ans+=sum[cur][id][k];
                if(cur+(1<<k)<r) ans-=a[cur+(1<<k)-1][nxt[cur][id][k]].s;
                id=to[cur+(1<<k)-1][nxt[cur][id][k]];
                cur+=(1<<k);
                if(cur<r and id==(int)a[cur].size()){
                    id=0;
                    ans+=T;
                }
                if(cur<r) ans+=a[cur][id].f;
            }
            cur=pos;
            id=i;
            while(cur>l){
                int t=upper_bound(all(b[cur-1]),make_pair(a[cur][id].f,inf2))-b[cur-1].begin()-1;
                if(t==-1){
                    t=(int)b[cur-1].size()-1;
                    ans+=T;
                }
                ans+=(a[cur][id].f-a[cur-1][t].f);
                id=t;
                cur--;
            }
            mn=min(mn,ans);
        }
        cout<<mn<<'\n';
    }
    return 0;
}
//maybe its multiset not set
//yeeorz
//diaoborz
/*
48
126
11
167
95
298
142
61
20
349


10 100
2
44 80
77 84
3
6 28
0 15
64 75
2
47 92
24 66
3
7 42
59 70
38 70
3
0 7
44 65
42 72
2
12 20
13 50
5
78 83
3 28
61 75
39 80
46 98
4
47 86
13 26
12 97
43 85
4
66 85
64 99
5 18
93 96
1
2 5
*/

Compilation message (stderr)

Main.cpp: In function 'void setIO(std::string)':
Main.cpp:15:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:16:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 8 / 8
• Subtask 3: 17 / 17
• Subtask 4: 23 / 23
• Subtask 5: 0 / 36
• Subtask 6: 0 / 10