Submission #1311802

#	Time	Username	Problem	Language	Result	Execution time	Memory
1311802		settop	Roller Coaster Railroad (IOI16_railroad)	C++20	0 / 100	161 ms	16080 KiB

railroad

#include "railroad.h"
#include<bits/stdc++.h>

using namespace std;
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;

#define ll long long
#define fall(i,a,b) for(int i=a;i<=b;i++)
#define rfall(i,a,b) for(int i=a;i>=b;i--)
#define pb push_back
#define all(x) x.begin(),x.end()
#define sz(x) (int)x.size()
#define ordered_set tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update>
const ll inf=1e16;
typedef pair<ll,ll> pii;

long long plan_roller_coaster(std::vector<int> s, std::vector<int> t) {
    int n = sz(s);

    set<pii> st;

    fall(i,0,n-1) st.insert({t[i],i});

    int cara=0;
    long long ans=0;

    fall(i,1,n-1) if(t[i]>t[cara]) cara=i;
    
    st.erase({t[cara],cara});

    while(sz(st)){
        auto it=st.upper_bound({s[cara],-1});
        if(it!=st.begin()) it--;
        
        auto [u,i]=*it;

        ans+=max(0ll,u-s[cara]); cara=i;
        st.erase(it);
    }

    return ans;
}

Compilation message (stderr)

railroad.h:1:9: warning: #pragma once in main file
    1 | #pragma once
      |         ^~~~
railroad_c.h:1:9: warning: #pragma once in main file
    1 | #pragma once
      |         ^~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 23
• Subtask 3: 0 / 30
• Subtask 4: 0 / 36