Submission #1005929

#	Time	Username	Problem	Language	Result	Execution time	Memory
1005929		irmuun	Meetings (IOI18_meetings)	C++17	0 / 100	16 ms	1724 KiB

meetings

#include<bits/stdc++.h>
 
using namespace std;
 
#define ll long long
#define pb push_back
#define ff first
#define ss second
#define all(s) s.begin(),s.end()
#define rall(s) s.rbegin(),s.rend()

struct segtree{
    int n;
    vector<int>d;
    segtree(int n):n(n){
        d.resize(4*n);
        build(1,0,n-1);
    }
    void build(int node,int l,int r){
        if(l==r){
            d[node]=0;
            return;
        }
        int mid=(l+r)/2;
        build(node*2,l,mid);
        build(node*2+1,mid+1,r);
    }
    int query(int node,int l,int r,int L,int R){
        if(L>R||L>r||l>R) return 0;
        if(l<=L&&R<=r){
            return d[node];
        }
        int mid=(l+r)/2;
        return max(query(node*2,l,mid,L,R),query(node*2+1,mid+1,r,L,R));
    }
    void update(int node,int l,int r,int pos,int val){
        if(pos<l||r<pos) return;
        if(l==r){
            d[node]=val;
            return;
        }
        int mid=(l+r)/2;
        update(node*2,l,mid,pos,val);
        update(node*2+1,mid+1,r,pos,val);
        d[node]=max(d[node*2],d[node*2+1]);
    }
};

vector<ll>minimum_costs(vector<int>H,vector<int>L,vector<int>R){
    int n=H.size(),m=L.size();
    vector<ll>ans(m,1e18);
    vector<int>p;
    for(int i=0;i<n;i++){
        if(H[i]==2){
            p.pb(i);
        }
    }
    segtree sg(n);
    for(int i=1;i<p.size();i++){
        sg.update(1,0,n-1,i-1,p[i]-p[i-1]-1);
    }
    for(int j=0;j<m;j++){
        if(p.empty()){
            ans[j]=R[j]-L[j]+1;
            continue;
        }
        int l=lower_bound(all(p),L[j])-p.begin();
        if(l==p.size()||p[l]>R[j]){
            ans[j]=R[j]-L[j]+1;
            continue;
        }
        int r=lower_bound(all(p),R[j]+1)-p.begin();
        r--;
        int mx=sg.query(1,0,n-1,l,r-1);
        mx=max(mx,p[l]-L[j]);
        mx=max(mx,R[j]-p[r]);
        ans[j]=2*(R[j]-L[j]+1)-mx;
    }
    return ans;
}

Compilation message (stderr)

meetings.cpp: In function 'std::vector<long long int> minimum_costs(std::vector<int>, std::vector<int>, std::vector<int>)':
meetings.cpp:59:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |     for(int i=1;i<p.size();i++){
      |                 ~^~~~~~~~~
meetings.cpp:68:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |         if(l==p.size()||p[l]>R[j]){
      |            ~^~~~~~~~~~

• Subtask 1: 0 / 4
• Subtask 2: 0 / 15
• Subtask 3: 0 / 17
• Subtask 4: 0 / 24
• Subtask 5: 0 / 40