Submission #204253

#	Time	Username	Problem	Language	Result	Execution time	Memory
204253		awlintqaa	Roller Coaster Railroad (IOI16_railroad)	C++14	0 / 100	1234 ms	11640 KiB

railroad

#define fast ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0)
#include <bits/stdc++.h>
using namespace std;
#define sqr 200
#define mid (l+r)/2
#define pb push_back
#define ppb pop_back
#define fi first
#define se second
#define lb lower_bound
#define ub upper_bound
#define ins insert
#define era erase
#define C continue
#define mem(dp,i) memset(dp,i,sizeof(dp))
#define mset multiset
typedef long long ll;
typedef short int si;
typedef long double ld;
typedef pair<int,int> pi;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<pi> vpi;
typedef vector<pll> vpll;
const ll mod=1e9+7;
const ll inf= 4e18;
const ld pai=acos(-1);
#include "railroad.h"
ll n ;
pll a[200009];
ll tree[800009];
void build(int node,int l,int r){
        if ( l==r ){
                tree[node]=a[l].se;
                return ;
        }
        build(node*2,l,mid);
        build(node*2+1,mid+1,r);
        tree[node]=min(tree[node*2],tree[node*2+1]);
}
void upd(int node,int l,int r,int id){
        if ( l==r ){
                tree[node]=inf;
                return ;
        }
        if ( id<=mid) upd(node*2,l,mid,id);
        else upd(node*2+1,mid+1,r,id);
        tree[node]=min(tree[node*2],tree[node*2+1]);
}
ll query(int node,int l,int r,int s,int e ){
        if ( s>r || e<l ) return inf;
        if ( s<=l && e>=r) return tree[node];
        return min(query(node*2,l,mid,s,e) , query(node*2+1,mid+1,r,s,e) );
}
ll bin(ll x){
        ll l =-1,r=n;
        while ( r-l>1){
                if ( a[mid].fi>=x)l=mid;
                else r=mid;
        }
        return l;
}
long long plan_roller_coaster(std::vector<int> s, std::vector<int> t) {
        n = (int) s.size();
        for(int i =0 ;i < n;i ++ ) {
                a[i]={s[i],t[i]};
        }
        sort(a,a+n);
        reverse(a,a+n);
        build(1,0,n-1);
        ll N = n ;
        ll S =1 ;
        while ( N -- ) {
                ll l =0 ,r=bin(S);
                if ( r == -1 ) return 1 ;
                ll X = query (1,0,n-1,l,r);
                if ( X == inf ) return 1;
          ll R = r;
                l--;r++;
                while ( r-l >1 ){
                        if ( query(1,0,n-1,mid,R) == X ) l=mid;
                        else r=mid;
                }
                S = X ;
                upd(1,0,n-1,l);
        }
        return 0 ;
}

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