Submission #114567

#	Time	Username	Problem	Language	Result	Execution time	Memory
114567		ly20	Roller Coaster Railroad (IOI16_railroad)	C++14	Compilation error	0 ms	0 KiB

railroad

#include<bits/stdc++.h>
using namespace std;
//#include "railroad.h"
const int MAXN=212345;
pair<int,int> v[MAXN];
set<pair<int,int> > se,ss;
long long plan_roller_coaster(vector<int> e,vector<int> s)
{
	int n=e.size();
	for(int i=0;i<n;i++)
	{
		se.insert(make_pair(e[i],i));ss.insert(make_pair(s[i],i));
	}
	long long resp1=0;
	int ini;
	int idk=(*(--ss.end())).second;
	ss.erase(make_pair(s[idk],idk));
	ini=e[idk];
	se.erase(make_pair(e[idk],idk));
	for(int i=0;i<n-1;i++)
	{	
		set<pair<int,int> >::iterator id=ss.upper_bound(make_pair(ini,0));
		if(id!=ss.begin())id--;
		idk=id->second;
		ss.erase(id);
		resp1+=max(0,s[idk]-ini);
		ini=e[idk];
		se.erase(make_pair(e[idk],idk));
	}
	for(int i=0;i<n;i++)
	{
		se.insert(make_pair(e[i],i));ss.insert(make_pair(s[i],i));
	}
	long long resp2=0;
	idk=(*(se.begin())).second;
	se.erase(make_pair(e[idk],idk));
	ini=s[idk];
	ss.erase(make_pair(s[idk],idk));
	for(int i=0;i<n-1;i++)
	{	
		set<pair<int,int> >::iterator id=se.lower_bound(make_pair(ini,0));
		if(id==se.end())id--;
		idk=id->second;
		se.erase(id);
		resp2+=max(0,ini-e[idk]);
		ini=s[idk];
		ss.erase(make_pair(s[idk],idk));
	}
	return min(resp1,resp2);
}
int main()
{
	int n;
	scanf("%d",&n);
	vector<int> e,s;
	for(int i=0;i<n;i++)
	{
		int a,b;
		scanf("%d %d",&a,&b);
		e.push_back(a);s.push_back(b);
	}
	printf("%lld\n",plan_roller_coaster(e,s));
	return 0;
}

Compilation message (stderr)

railroad.cpp: In function 'int main()':
railroad.cpp:54:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
railroad.cpp:59:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d",&a,&b);
   ~~~~~^~~~~~~~~~~~~~~
/tmp/ccldWJBk.o: In function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/ccr5FNzi.o:railroad.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status