Submission #387518

#	Time	Username	Problem	Language	Result	Execution time	Memory
387518		CaroLinda	Safety (NOI18_safety)	C++14	100 / 100	95 ms	5640 KiB

safety

#include <bits/stdc++.h>

#define ll long long
#define all(x) x.begin(),x.end()
#define ff first
#define ss second
#define pb push_back
#define mk make_pair
#define pii pair<int,int>
#define sz(x) (int)(x.size())
#define mkt make_tuple
#define lp(i,a,b) for(int i = a ; i < b ; i++ )
#define debug printf

const int MAXN = 2e5+10 ;

using namespace std ;

int N ;
ll H , a ,b  ;
priority_queue<ll> lef ;
priority_queue< ll , vector<ll>, greater<ll> > rig ;
ll lzLef , lzRig ;

void print()
{
	debug("y = x*%lld + %lld\n", a , b  ); 
	vector<ll> l , r ;
	while( !rig.empty() )
	{
		r.pb( rig.top() ) ;
		rig.pop() ;
	}
	while(!lef.empty())
	{
		l.pb( lef.top() ) ;
		lef.pop() ;
	}
	for(auto e : r ) rig.push(e) ;
	for(auto e : l ) lef.push(e) ;

	for(int i = sz(l)-1 ; i >= 0 ; i-- ) debug("%lld ", l[i]+lzLef ) ;
	debug("---- ") ;
	for(auto e : r ) debug("%lld " , e+lzRig ) ;
	debug("\n") ;
}

int main()
{
	scanf("%d %lld", &N, &H ) ;

	for(int i = 1 ; i <= N ; i++ )
	{
		ll x ;
		scanf("%lld", &x ) ;

		a++ ;
		b -= x ;

		if(lef.empty()) 
		{
			assert(i == 1 ) ;
			lef.push(x) ;
			rig.push(x); 
		}
		else
		{
			if( x >= lef.top()+lzLef )
			{
				rig.push( x-lzRig ) ;
				rig.push( x-lzRig ) ;
				lef.push( rig.top()+lzRig-lzLef ) ;
				rig.pop() ;
			}
			else
			{
				lef.push(x-lzLef) ;
				lef.push( x-lzLef ) ;
				rig.push( lef.top()+lzLef-lzRig ) ;
				lef.pop() ;
			}
		}

		//print() ;
		//debug("\n") ;

		lzLef -= H ;
		lzRig += H ;
		b -= a*H ;

		//print() ;
		//debug("\n\n") ;
	}

	while( !rig.empty() )
	{
		ll p = rig.top()+lzRig ;
		rig.pop() ;

		b += p ;
		a-- ;
	}

	printf("%lld\n" , b ) ;
}

Compilation message (stderr)

safety.cpp: In function 'int main()':
safety.cpp:50:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   50 |  scanf("%d %lld", &N, &H ) ;
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~
safety.cpp:55:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   55 |   scanf("%lld", &x ) ;
      |   ~~~~~^~~~~~~~~~~~~

• Subtask 1: 3 / 3
• Subtask 2: 4 / 4
• Subtask 3: 9 / 9
• Subtask 4: 5 / 5
• Subtask 5: 6 / 6
• Subtask 6: 11 / 11
• Subtask 7: 11 / 11
• Subtask 8: 22 / 22
• Subtask 9: 29 / 29