Submission #933678

#	Time	Username	Problem	Language	Result	Execution time	Memory
933678		thunopro	The Big Prize (IOI17_prize)	C++14	100 / 100	29 ms	6200 KiB

prize

#include<bits/stdc++.h>
using namespace std ; 
#define maxn 200009
#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 main () 
//{
//	ios_base::sync_with_stdio(0); 
//	cin.tie(0);cout.tie(0); 
////	rf () ; 
//}

vi ask ( int i ) ; 

int res = -1 , mx = -1 ; 
vi asked [maxn] ; 
vi Ask ( int i ) 
{
	if ( asked[i].empty() ) asked [i] = ask (i) ; 
	chkmax (mx,asked[i][0]+asked[i][1]) ; 
	return asked [i] ; 
}
int Ask_cnt ( int i ) 
{
	vi v = Ask (i) ; 
	if ( v [0] + v [1] == 0 ) res = i ; 
	return v [0] + v [1] ; 
}
void solve ( int l , int r ) 
{
	while ( Ask_cnt (l) != mx && l <= r ) l ++ ; 
	while ( Ask_cnt (r) != mx && l <= r ) r -- ; 
	if ( res != -1 ) return ; 
	if ( l >= r ) return ; 
	vi A = Ask (l) , B = Ask (r) ; 
	if ( A [0] == B [0] && A [1] == B [1] ) return ; 
	int mid = (l+r)/2 ; 
	solve (l,mid) ; 
	solve (mid,r) ; 
}

int find_best ( int n ) 
{
	solve (0,n-1) ; 
	return res ; 
}

Compilation message (stderr)

prize.cpp: In function 'void rf()':
prize.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: 20 / 20
• Subtask 2: 80 / 80