Submission #1110158

#	Time	Username	Problem	Language	Result	Execution time	Memory
1110158		thunopro	Fish 3 (JOI24_fish3)	C++14	9 / 100	33 ms	7240 KiB

Main

#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 
#define TIME ( 1.0*clock() / CLOCKS_PER_SEC )
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) ;
}

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 ;
ll d ;  
ll a [maxn] , b [maxn] ; 
pii q [maxn] ; 

void sub1 () 
{
	for ( int run = 1 ; run <= nq ; run ++ ) 
	{
		int l = q[run].fi , r = q[run].se ; 
		for ( int i = l ; i <= r ; i ++ ) b [i] = a [i] ; 
		bool ok = true ; 
		ll res = 0 ; 
		for ( int i = r-1 ; i >= l ; i -- ) 
		{
			if ( b [i] > b [i+1] ) 
			{
				ll need = (b[i]-b[i+1]-1)/d +  1; 
				b [i] -= need*d ; 
				res += need ; 
			}
			if ( b [i] < 0 ) ok = false ; 
		}
		if ( ok == false ) cout << -1 << "\n" ; 
		else cout << res << "\n" ; 
	}
}
int main () 
{
	ios_base::sync_with_stdio(0); 
	cin.tie(0);cout.tie(0); 
//	rf () ;
	cin >> n >> d ; 
	for ( int i = 1 ; i <= n ; i ++ ) cin >> a [i] ; 
	cin >> nq ; 
	for ( int i = 1 ; i <= nq ; i ++ ) cin >> q [i].fi >> q [i].se ; 
	if ( n <= 3000 && nq <= 30000 ) sub1 () ; 
	

}

Compilation message (stderr)

Main.cpp: In function 'void rf()':
Main.cpp:32:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |  freopen ("bai1.inp","r",stdin) ;
      |  ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 0 / 7
• Subtask 3: 0 / 28
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36