Submission #967506

#	Time	Username	Problem	Language	Result	Execution time	Memory
967506		thunopro	Simple game (IZhO17_game)	C++14	100 / 100	51 ms	7260 KiB

game

#include<bits/stdc++.h>
using namespace std ; 
#define maxn 1000009 
#define ll long long 
#define fi first 
#define se second 
#define pb push_back 
#define left id<<1
#define right id<<1|1 
#define _lower(x) lower_bound(v.begin(),v.end(),x)-v.begin()+1 
#define TIME (1.0*clock()/TIME_PERS_SEC) 
#define re exit(0); 

const int mod = 1e9+7 ; 
const int INF = 1e9 ; 

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

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

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

mt19937 rng (time(0)) ; 

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 , nq ; 
int a [maxn] ; 

int bit [maxn] ; 

void update ( int x , int w ) 
{
	while ( x < maxn ) bit [x] += w , x += (x&-x) ; 
}
int get ( int x ) 
{
	int res = 0 ; 
	while ( x ) res += bit [x] , x -= (x&-x) ; 
	return res ; 
}
void update ( int x , int y , int w ) 
{
	if ( x > y ) swap (x,y) ; 
	update (x,1*w) ;
	update (y+1,-1*w) ;  
}

int main ()
{
	ios_base::sync_with_stdio(0); 
	cin.tie(0);cout.tie(0); 
//	rf () ; 
	cin >> n >> nq ; 
	for ( int i = 1 ; i <= n ; i ++ ) cin >> a [i] ; 
	for ( int i = 1 ; i < n ; i ++ ) update (a[i],a[i+1],1) ; 
	while ( nq -- ) 
	{
		int op ; cin >> op ; 
		if ( op == 1 ) 
		{
			int pos , val ; cin >> pos >> val ; 
			if ( pos > 1 ) update (a[pos-1],a[pos],-1) ; 
			if ( pos < n ) update (a[pos],a[pos+1],-1) ; 
			a [pos] = val ; 
			if ( pos > 1 ) update (a[pos-1],a[pos],1) ; 
			if ( pos < n ) update (a[pos],a[pos+1],1) ; 
		}
		else 
		{
			int x ; cin >> x ; cout << get (x) << "\n" ; 
		}
	}
}

Compilation message (stderr)

game.cpp: In function 'void rf()':
game.cpp:33:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |  freopen ("bai1.inp","r",stdin) ;
      |  ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 22 / 22
• Subtask 2: 27 / 27
• Subtask 3: 51 / 51