Submission #1238370

#	Time	Username	Problem	Language	Result	Execution time	Memory
1238370		opeleklanos	Osumnjičeni (COCI21_osumnjiceni)	C++20	0 / 110	124 ms	26232 KiB

Main

#include <iostream>
#include <vector>
#include <set>
using namespace std;

vector<vector<int>> lift;
int findLift(int from, int mn){
    int i = 0;
    int par = 1;
    while(lift[from][i] <= mn) i++, par*=2;
    return par/2 + (i>0?findLift(lift[from][i-1], mn):0);
}

int main(void){
   // freopen("input.txt", "r", stdin);

    vector<pair<int, int>> h;
    int n;
    cin>>n;
    h.assign(n, {});

    for(int i = 0; i<n; i++) cin>>h[i].first>>h[i].second;

    vector<int> step(n, 0);
    set<pair<int, pair<int, int>>> s;
    int nextSt = n;
    int p2 = n;
    for(int i = n-1; i>=0; i--){
        auto e = s.lower_bound({h[i].first, {0, 0}});
        
        while(e!=s.end() && e->first <= h[i].second){
            p2--;
            s.erase({h[p2].first, {h[p2].second, p2}});
            e = s.lower_bound({h[i].first, {0, 0}});
        }
        while(e!= s.end() && e!= s.begin() && prev(e)->second.first >= h[i].first){
            p2--;
            s.erase({h[p2].first, {h[p2].second, p2}});
            e = s.lower_bound({h[i].first, {0, 0}});
        }
        s.insert({h[i].first, {h[i].second, i}});
        step[i] = p2;
    }


    lift.assign(n+1, vector<int>(20, -1));

    for(int i = 0; i<20; i++) lift[n][i] = n;
    for(int i = 0; i<n; i++) lift[i][0] = step[i];

    for(int i = n-1; i>=0; i--){
        for(int j = 1; j<20; j++){
            lift[i][j] = lift[lift[i][j-1]][j-1];
        }
    }

    int q;
    cin>>q;
    for(int i = 0; i<q; i++){
        int l, r;
        cin>>l>>r;
        cout<<findLift(l-1, r-1)+1<<endl;
    }

    return 0;
}

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