Submission #971719

#	Time	Username	Problem	Language	Result	Execution time	Memory
971719		Aiperiii	Divide and conquer (IZhO14_divide)	C++14	100 / 100	159 ms	25540 KiB

divide

#include <bits/stdc++.h>
#define int long long
#define ff first
#define ss second
#define pb push_back
#define all(x) x.begin(),x.end()
using namespace std;
const int N=2e5+5;
int t[N*4];
void build(int v,int tl,int tr){
    t[v]=1e9;
    if(tl!=tr){
        int tm=(tl+tr)/2;
        build(v*2,tl,tm);
        build(v*2+1,tm+1,tr);
    }
}
void update(int v,int tl,int tr,int pos,int x){
    if(tl==tr)t[v]=min(t[v],x);
    else{
        int tm=(tl+tr)/2;
        if(pos<=tm)update(v*2,tl,tm,pos,x);
        else update(v*2+1,tm+1,tr,pos,x);
        t[v]=min(t[v*2],t[v*2+1]);
    }
}
int get(int v,int tl,int tr,int l,int r){
    if(tl>r or tr<l)return 1e9;
    if(l<=tl && tr<=r)return t[v];
    int tm=(tl+tr)/2;
    return min(get(v*2,tl,tm,l,r),get(v*2+1,tm+1,tr,l,r));
}
signed main(){
    ios_base::sync_with_stdio();
    cin.tie(0);cout.tie(0);
    int n;
    cin>>n;
    vector <int> x(n+1),g(n+1),e(n+1),pre(n+1),prg(n+1);
    for(int i=1;i<=n;i++){
        cin>>x[i]>>g[i]>>e[i];
    }
    vector <int> v;
    for(int i=1;i<=n;i++){
        pre[i]=pre[i-1]+e[i];
        v.pb(pre[i]-x[i]);
        v.pb(pre[i-1]-x[i]);
        prg[i]=prg[i-1]+g[i];
    }
    sort(all(v));
    map <int,int> val_ind;
    int ind=1;
    for(int i=0;i<v.size();i++){
        if(i==0 or v[i]!=v[i-1]){
            val_ind[v[i]]=ind;
            ind++;
        }
    }
    ind--;
    int mx=0;
    build(1,1,ind);
    for(int i=1;i<=n;i++){
        update(1,1,ind,val_ind[pre[i-1]-x[i]],i);
        int pos=get(1,1,ind,1,val_ind[pre[i]-x[i]]);
        mx=max(mx,prg[i]-prg[pos-1]);
    }
    cout<<mx<<"\n";
}
/*
4
0 5 1
1 7 2
4 4 1
7 15 1
*/

Compilation message (stderr)

divide.cpp: In function 'int main()':
divide.cpp:52:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |     for(int i=0;i<v.size();i++){
      |                 ~^~~~~~~~~

• Subtask 1: 17 / 17
• Subtask 2: 31 / 31
• Subtask 3: 52 / 52