Submission #431118

#	Time	Username	Problem	Language	Result	Execution time	Memory
431118		davi_bart	Roller Coaster Railroad (IOI16_railroad)	C++17	30 / 100	330 ms	16796 KiB

railroad

#include "railroad.h"
#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define fi first
#define se second
#define ld long double
#define pb push_back

long long plan_roller_coaster(std::vector<int> s, std::vector<int> t) {
    int n = (int) s.size();
    multiset<pair<int,int> > k;
    for(int i=0;i<s.size();i++)k.insert({s[i],i});
    int c=0;
    for(int i=0;i<s.size();i++){
        auto y=k.lower_bound({t[i],-1000});
        if(y!=k.end() && y->se==i)y=next(y);

        if(y==k.end())c++;
        else {
            //cout<<t[i]<<endl;
            k.erase(y);
        }
    }
    //cout<<"c: "<<c<<endl;
    return c>1;
}

Compilation message (stderr)

railroad.cpp: In function 'long long int plan_roller_coaster(std::vector<int>, std::vector<int>)':
railroad.cpp:14:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |     for(int i=0;i<s.size();i++)k.insert({s[i],i});
      |                 ~^~~~~~~~~
railroad.cpp:16:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |     for(int i=0;i<s.size();i++){
      |                 ~^~~~~~~~~
railroad.cpp:12:9: warning: unused variable 'n' [-Wunused-variable]
   12 |     int n = (int) s.size();
      |         ^

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