Submission #1040395

#	Time	Username	Problem	Language	Result	Execution time	Memory
1040395		vjudge1	Schools (IZhO13_school)	C++14	100 / 100	79 ms	11384 KiB

school

#include<bits/stdc++.h>
using namespace std ; 
#define maxn 300009
#define ll long long 
#define pb push_back 
#define fi first 
#define se second 
#define left id<<1
#define right id<<1|1 
#define re exit(0); 
#define _lower(x) lower_bound(v.begin(),v.end(),x)-v.begin()+1
const int mod = 1e9+7 ;
const int INF = 1e9 ; 

typedef vector<int> vi ; 
typedef pair<int,int> pii ; 
typedef vector<pii> vii ; 

template < typename T > void chkmin ( T &a , T b ) { if ( a > b ) a = b ; } 
template < typename T > void chkmax ( T &a , T b ) { if ( a < b ) a = b ; } 

void add ( int &a , int b ) 
{
	a += b ; 
	if ( a >= mod ) a -= mod ; 
	if ( a < 0 ) a += mod ; 
}

void rf () 
{
	freopen ("bai1.inp","r",stdin) ;
}

int _pow ( int a , int n ) 
{
	if ( n == 0 ) return 1 ; 
	int res = _pow (a,n/2) ; 
	if ( n % 2 ) return 1ll*res*res%mod*a%mod ; 
	else return 1ll*res*res%mod ; 
}

int n , m1 , m2 ; 
pii a [maxn] ; 
bool cmp ( pii u , pii v ) 
{
	return u.fi + v.se > u.se + v.fi ; 
}
ll L [maxn],R[maxn] ; 
int main () 
{
	ios_base::sync_with_stdio(0); 
	cin.tie(0);cout.tie(0); 
//	rf () ; 	
	cin >> n >> m1 >> m2 ; 
	for ( int i = 1 ; i <= n ; i ++ ) 
	{
		cin >> a [i].fi >> a[i].se ; 
	}
	sort(a+1,a+n+1,cmp) ; 
//	for ( int i = 1 ; i <= n ; i ++ ) cout << a[i].fi << " " << a[i].se << "\n" ; re
	priority_queue<int,vi,greater<int>> S ; 
	ll sum = 0 ; 
	for ( int i = 1 ; i <= n ; i ++ ) 
	{
		sum += a[i].fi ; 
		S.push(a[i].fi) ; 
		if ( S.size() > m1 ) sum -= S.top() , S.pop() ;
		if ( S.size() == m1 ) L [i] = sum ; 
		else L [i] = -1e18 ; 
	}
	while (S.size()) S.pop() ; 
	sum = 0 ; 
	for ( int i = n ; i >= 1 ; i -- ) 
	{
		sum += a[i].se ; 
		S.push(a[i].se) ;
		if ( S.size() > m2 ) sum -= S.top() , S.pop() ; 
		if ( S.size() == m2 ) R [i] = sum ; 
		else R[i] = -1e18 ; 
	}
	
	ll res = -1e18 ; 
	for ( int i = m1+1 ; i <= n-m2+1 ; i ++ ) chkmax (res,L[i-1]+R[i]) ; 
	cout << res ; 
	
}

Compilation message (stderr)

school.cpp: In function 'int main()':
school.cpp:67:17: warning: comparison of integer expressions of different signedness: 'std::priority_queue<int, std::vector<int>, std::greater<int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   67 |   if ( S.size() > m1 ) sum -= S.top() , S.pop() ;
      |        ~~~~~~~~~^~~~
school.cpp:68:17: warning: comparison of integer expressions of different signedness: 'std::priority_queue<int, std::vector<int>, std::greater<int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   68 |   if ( S.size() == m1 ) L [i] = sum ;
      |        ~~~~~~~~~^~~~~
school.cpp:77:17: warning: comparison of integer expressions of different signedness: 'std::priority_queue<int, std::vector<int>, std::greater<int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   77 |   if ( S.size() > m2 ) sum -= S.top() , S.pop() ;
      |        ~~~~~~~~~^~~~
school.cpp:78:17: warning: comparison of integer expressions of different signedness: 'std::priority_queue<int, std::vector<int>, std::greater<int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   78 |   if ( S.size() == m2 ) R [i] = sum ;
      |        ~~~~~~~~~^~~~~
school.cpp: In function 'void rf()':
school.cpp:31:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |  freopen ("bai1.inp","r",stdin) ;
      |  ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100